WO2014038708A1 - ベンゾチエノベンゾチオフェン誘導体、有機半導体材料、及び有機トランジスタ - Google Patents
ベンゾチエノベンゾチオフェン誘導体、有機半導体材料、及び有機トランジスタ Download PDFInfo
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- WO2014038708A1 WO2014038708A1 PCT/JP2013/074364 JP2013074364W WO2014038708A1 WO 2014038708 A1 WO2014038708 A1 WO 2014038708A1 JP 2013074364 W JP2013074364 W JP 2013074364W WO 2014038708 A1 WO2014038708 A1 WO 2014038708A1
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- 0 *c(cc1)cc2c1c([s]c1cc(C#Cc3cc(cccc4)c4cc3)ccc11)c1[s]2 Chemical compound *c(cc1)cc2c1c([s]c1cc(C#Cc3cc(cccc4)c4cc3)ccc11)c1[s]2 0.000 description 5
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- C07D495/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms
- C07D495/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
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- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6576—Polycyclic condensed heteroaromatic hydrocarbons comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene
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- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/466—Lateral bottom-gate IGFETs comprising only a single gate
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- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having potential barriers
- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/484—Insulated gate field-effect transistors [IGFETs] characterised by the channel regions
Definitions
- the present invention relates to a benzothienobenzothiophene derivative, an organic semiconductor material using the same, an organic semiconductor ink containing the same, and an organic transistor using the same.
- a thin film transistor (TFT) using amorphous silicon or polycrystalline silicon has been widely used as a switching element for liquid crystal display devices, organic EL display devices and the like.
- TFT thin film transistor
- the CVD apparatus used for manufacturing these TFTs using silicon is expensive, manufacturing a large TFT element causes an increase in manufacturing cost.
- the silicon material is formed at a high temperature, it cannot be applied to plastic substrates, which are candidates for flexible display substrates, due to heat resistance problems.
- an organic TFT using an organic semiconductor as a channel semiconductor layer instead of a silicon semiconductor has been proposed.
- organic semiconductors can be printed and formed at low temperatures, they do not require large-scale manufacturing facilities and can be applied to plastics with poor heat resistance, and are expected to lead flexible displays.
- organic semiconductors have lower carrier mobility than silicon semiconductors, and as a result, the response speed of TFTs has been a problem for practical use.
- organic semiconductors with the same mobility as amorphous silicon have been developed. It has been.
- Patent Document 1 discloses 2,7-substituted [1] benzothieno [3,2-b] [1] benzothiophene skeleton (hereinafter referred to as [1] benzothieno [3,2-b] [1] benzothiophene.
- BTBT compounds having abbreviated as BTBT
- a substituent halogen, C 1 -C 18 alkyl, C 1 -C 18 alkyl having halogen, C 1 -C 18 alkyloxy, C 1 -C 18 alkylthio or aryl, or aryl having at least one of halogen, C 1 -C 18 alkyl, halogen-containing C 1 -C 18 alkyl, C 1 -C 18 alkyloxy, C 1 -C 18 alkylthio Things are listed. That the mobility of these compounds (cm 2 / Vs) is 0.17 ⁇ 0.31cm 2 / Vs.
- Patent Document 2 describes a compound having a 2,7-substituted BTBT skeleton, and the substituent is a hydrogen atom or a halogeno-substituted C 1 -C 36 fatty hydrocarbon group. ing. It is described that the mobility (cm 2 / Vs) of these compounds is 0.12 to 4.5 cm 2 / Vs.
- Patent document 3 describes a compound having a 2,7-substituted BTBT skeleton having a chalcogenophene ring. It has been reported that by introducing a chalcogenophene ring, the adhesion between the semiconductor thin film and the electrode and the stability of the thin film in the atmosphere are improved, and the mobility is 0.08 to 0.22 cm 2 / Vs.
- Patent Documents 4 to 6 describe compounds having a benzothienothiophene skeleton having an acetylene structure. It is said to be effective as a precursor for organic semiconductor materials and as a precursor for organic semiconductor polymers.
- Patent Document 7 describes a compound having a broad BTBT skeleton that expresses a higher-order liquid crystal phase, but the derivative according to the present invention is not known.
- Patent Document 8 describes an organic thin film transistor compound having a structure having an aromatic heterocyclic ring as a skeleton, but does not describe a derivative according to the present invention. It is described that the order is about 10 ⁇ 1 to 10 ⁇ 2 (cm 2 / Vs).
- Patent Document 9 describes that in an organic thin film transistor, a specific organic compound having an aromatic hydrocarbon group or an aromatic heterocyclic group and an acetylene structure at the center can be used. However, there is no description as to whether or not the compound exhibits a higher-order liquid crystal phase, which is the subject of the present invention.
- the organic semiconductor material is required to easily form a film with a high mobility without deterioration in performance even when the printed film is formed.
- an object of the present invention is to provide an organic semiconductor material that can easily provide a film with high carrier mobility without going through a complicated process, and has small variations in mobility of the obtained semiconductor element, and a compound that can be used therefor Is to provide.
- a BTBT derivative having an arylene acetylene structure having a specific structure is crystallized via a high-order liquid crystal phase having a high molecular arrangement order, so that it is complicated even in printed film formation.
- the inventors have found that a film having high mobility and small variation in mobility can be easily formed without requiring any heat treatment, and the present invention has been completed.
- an organic semiconductor excellent in high mobility and performance stability in TFT can be provided.
- Example 2 (a) Example of a polarization micrograph (crystal phase) showing a polarization microscope texture at room temperature of compound b obtained in Example 2, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example 4 (a) Example of a polarization micrograph (crystal phase) showing a polarization microscope texture at room temperature of compound d obtained in Example 4, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example 5 (a) Example of a polarization micrograph (crystal phase) showing a polarization microscope texture at room temperature of compound e obtained in Example 5, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example 7 (a) Example of a polarization micrograph (crystal phase) showing a polarization microscope texture at room temperature of compound g obtained in Example 7, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example 8 (a) Example of a polarization micrograph (crystal phase) showing a polarization microscope texture at room temperature of compound h obtained in Example 8, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example of a polarization micrograph (crystal phase) showing a polarization microscope texture at room temperature of compound i obtained in Example 9, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example 10 (a) Example of a polarizing microscope photograph (crystalline phase) showing a polarizing microscope texture at room temperature of compound j obtained in Example 10, and (b) Polarized light showing a polarizing microscope texture of a phase in a high temperature region adjacent to the crystalline phase. It is an example (higher order liquid crystal phase) of a micrograph.
- Example of a polarization micrograph showing a polarization microscope texture at room temperature of compound k obtained in Example 11, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example 12 (a) Example of a polarization micrograph (crystal phase) showing a polarization microscope texture at room temperature of compound 1 obtained in Example 12, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example of a polarization micrograph (crystal phase) showing a polarization microscope texture at room temperature of the compound m obtained in Example 13, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example of a polarizing microscope photograph (crystalline phase) showing a polarizing microscope texture at room temperature of compound n obtained in Example 14, and (b) Polarized light showing a polarizing microscope texture of a phase in a high temperature region adjacent to the crystalline phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example 15 (a) Example of a polarization micrograph (crystal phase) showing a polarization microscope texture at room temperature of compound o obtained in Example 15, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example of a polarization micrograph showing a polarization microscope texture at room temperature of compound q obtained in Example 17, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example of a polarization micrograph showing a polarization microscope texture at room temperature of the compound r obtained in Example 18, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example of a polarization micrograph showing a polarization microscope texture at room temperature of the compound s obtained in Example 19, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example of a polarization micrograph showing a polarization microscope texture at room temperature of the compound t obtained in Example 20, and (b) Polarization showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- Example 21 (a) Example of polarized light microscope photograph (crystal phase) showing polarization microscope texture at room temperature of compound u obtained in Example 21, and (b) Polarized light showing polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase It is an example (higher order liquid crystal phase) of a micrograph.
- R 1 -and R 2 - are either (I) or (II) below, and at least one of them is (I).
- Ar 1 is an aromatic hydrocarbon group or heteroaromatic group which may have a substituent
- Ar 2 is an aromatic hydrocarbon group which may have a substituent or a heteroaromatic which may have a substituent.
- R ′ is a hydrogen atom, a trialkylsilyl group having an alkyl group having 1 to 4 carbon atoms, an alkyl group having 1 to 20 carbon atoms, an optionally substituted aromatic hydrocarbon group or a heteroaromatic group Base.
- R 1 - is a group of the following general formula (2) or (3)
- R 2 represents an alkyl group having 2 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkyl group having 2 to 20 carbon atoms having a halogen atom, an alkoxyalkyl group having 3 to 20 carbon atoms, or 3 to 3 carbon atoms.
- alkylsulfanylalkyl groups alkylaminoalkyl groups having 3 to 20 carbon atoms, aromatic hydrocarbon groups or heteroaromatic groups, and An alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkyl group having 1 to 20 carbon atoms having a halogen atom, an alkoxyalkyl group having 3 to 20 carbon atoms, and an alkylsulfanylalkyl having 3 to 20 carbon atoms An aromatic hydrocarbon group or heteroaromatic group having a substituent, or an alkylaminoalkyl group having 3 to 20 carbon atoms as a substituent, Group selected from 1.
- the compound represented by the general formula (1) is a compound having a substituent in the BTBT skeleton, at least one of which is a group of the general formula (2) or (3) having a specific arylene acetylene structure, and the other Is an alkyl group having 2 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkyl group having 2 to 20 carbon atoms having a halogen atom, an alkoxyalkyl group having 3 to 20 carbon atoms, an alkyl having 3 to 20 carbon atoms Aromatic having a sulfanylalkyl group, an alkylaminoalkyl group having 3 to 20 carbon atoms, an aromatic hydrocarbon group or a heteroaromatic group, an alkyl group having 2 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms as a substituent.
- the BTBT ring is connected to the aromatic ring via the acetylene moiety, the mobility is improved by expanding the ⁇ conjugate plane, and the higher order by suppressing the rotational motion between the BTBT ring and the substituent. It is possible to realize a semiconductor element that contributes to the development of the liquid crystal phase and has high mobility and small variation in mobility.
- Ar 1 of the substituent represented by the general formula (2) is not particularly limited as long as it is an aromatic hydrocarbon group which may have a substituent or a heteroaromatic group which may have a substituent.
- Ar 1 of the substituent represented by the general formula (2) is not particularly limited as long as it is an aromatic hydrocarbon group which may have a substituent or a heteroaromatic group which may have a substituent.
- the following can be mentioned.
- An unsubstituted monocyclic or polycyclic aromatic hydrocarbon group having 6 to 24 carbon atoms such as a p-terphenyl group or a quarterphenyl group,
- o-tolyl group m-tolyl group, p-tolyl group, 2,4-xylyl group, 2,6-xylyl group, mesityl group, duryl group, 4-ethylphenyl group, 4-n-propylphenyl group, 4 -Isopropylphenyl group, 4-n-butylphenyl group, 4-n-pentylphenyl group, 4-n-hexylphenyl group, 4-n-decaphenyl group, 4-stearylphenyl group, 9,9'-dihexylfur
- An alkyl-substituted aromatic hydrocarbon group in which the aromatic hydrocarbon group is substituted with an alkyl group having 1 to 18 carbon atoms, such as an oleenyl group;
- An alkenyl-substituted aromatic hydrocarbon group in which the aromatic hydrocarbon group is substituted with an alkenyl group having 2 to 20 carbon atoms, such as a sty
- aromatic hydrocarbon groups such as 4-fluorophenyl group, 2,6-fluorophenyl group, 4-chlorophenyl group, 2,3,4,5,6-perfluorophenyl group are fluorine atom, chlorine atom, bromine
- a halogenated aromatic hydrocarbon group substituted with a halogen such as an atom, 4- (2-ethoxyethyl) phenyl group, 4- (2-n-hexyloxyethyl) phenyl group, 4- (2-n-heptyloxyethyl) phenyl group, 4- (2-n-tetradecyloxyethyl) ) Phenyl group, 4- (2-cyclohexyloxyethyl) phenyl group, 4- (12-ethoxydodecyl) phenyl group, 4- (cyclohexyloxyethyl) phenyl group, etc., the aromatic hydrocarbon group has 3 to 20 carbon atoms.
- An alkylsulfanylalkyl-substituted aromatic hydrocarbon group in which the aromatic hydrocarbon group is substituted with an alkylsulfanylalkyl group having 3 to 20 carbon atoms
- the above aromatic hydrocarbon groups such as 4- (3-octylaminopropyl) phenyl group, 4- (3-dodecylaminopropyl) phenyl group, 4- (diethylaminoethyl) phenyl group, etc. are alkylamino having 3 to 20 carbon atoms.
- alkylaminoalkyl-substituted aromatic hydrocarbon group substituted with an alkyl group are alkylamino having 3 to 20 carbon atoms.
- a halogen such as a fluorine atom, a chlorine atom or a bromine atom, such as a fluoropyridinyl group or a fluoroindolyl group
- alkylsulfanylalkyl-substituted heteroaromatic group in which the aromatic hydrocarbon group is substituted with an alkylsulfanylalkyl group having 3 to 20 carbon atoms, Alkylaminoalkyl having 3 to 20 carbon atoms, such as 5- (3-octylaminopropyl) thienyl group, 5- (3-dodecylaminopropyl) thienyl group, 5- (diethylaminoethyl) thienyl group, etc.
- An alkylaminoalkyl-substituted heteroaromatic group substituted with a group, and the like.
- Ar 1 is preferably an aromatic hydrocarbon group or a heteroaromatic group having a substituent, from the viewpoint of exhibiting a higher-order liquid crystal phase and thus suppressing variation in mobility, and having 1 to 12 carbon atoms.
- An aromatic hydrocarbon group or a heteroaromatic group having the above substituents is particularly preferred.
- Ar 2 of the substituent represented by the general formula (3) is not particularly limited as long as it is an aromatic hydrocarbon group which may have a substituent or a heteroaromatic group which may have a substituent.
- Ar 2 of the substituent represented by the general formula (3) is not particularly limited as long as it is an aromatic hydrocarbon group which may have a substituent or a heteroaromatic group which may have a substituent.
- the following can be mentioned.
- 6 carbon atoms such as phenylene group, naphthylene group, azulylene group, acenaphthenylene group, anthrylene group, phenanthrylene group, naphthacenylene group, fluorenylene group, pyrenylene group, chrysenylene group, peryleneylene group, biphenylene group, p-terphenylene group, quarterphenylene group, etc.
- the aromatic hydrocarbon group is an alkyl group having 1 to 10 carbon atoms, such as a tolylene group, a xylylene group, an ethylphenylene group, a propylphenylene group, a butylphenylene group, a methylnaphthylene group, or a 9,9′-dihexylfluorenylene group.
- a substituted alkyl-substituted aromatic hydrocarbon group is an alkyl group having 1 to 10 carbon atoms, such as a tolylene group, a xylylene group, an ethylphenylene group, a propylphenylene group, a butylphenylene group, a methylnaphthylene group, or a 9,9′-dihexylfluorenylene group.
- Examples thereof include a halogenated aromatic hydrocarbon group in which the aromatic hydrocarbon group is substituted with a halogen such as a fluorine atom, a chlorine atom, or a bromine atom, such as a fluorophenylene group, a chlorophenylene group, or a bromophenylone group.
- a halogen such as a fluorine atom, a chlorine atom, or a bromine atom
- heteroaromatic groups such as thienylene and pyridylene, and heteroaromatic groups in which these are substituted can also be used.
- R ′ of the substituent represented by the general formula (3) has a hydrogen atom, a trialkylsilyl group having an alkyl group having 1 to 4 carbon atoms, an alkyl group having 1 to 20 carbon atoms, or a substituent.
- R ′ of the substituent represented by the general formula (3) has a hydrogen atom, a trialkylsilyl group having an alkyl group having 1 to 4 carbon atoms, an alkyl group having 1 to 20 carbon atoms, or a substituent.
- R ′ of the substituent represented by the general formula (3) has a hydrogen atom, a trialkylsilyl group having an alkyl group having 1 to 4 carbon atoms, an alkyl group having 1 to 20 carbon atoms, or a substituent.
- Examples of the trialkylsilyl group having an alkyl group having 1 to 4 carbon atoms include trimethylsilyl group, triethylsilyl group, tri n-propylsilyl group, triiso-propylsilyl group, tri n-butylsilyl, trisec-butyl group,
- Examples of the alkyl group having 1 to 20 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, n-pentyl group, isopentyl group, neopentyl group, n-hexyl group, 1 -Methylpentyl group, 4-methyl-2-pentyl group, 3,3-dimethylbutyl group, 2-ethylbutyl group, n-heptyl group, 1-methylhexyl group, cyclohexylmethyl group, n-oc
- a monocyclic or polycyclic aromatic hydrocarbon group having 6 to 24 carbon atoms such as a group, a p-terphenyl group, and a quarterphenyl group
- o-tolyl group m-tolyl group, p-tolyl group, 2,4-xylyl group, 2,6-xylyl group, mesityl group, duryl group, 4-ethylphenyl group, 4-n-propylphenyl group, 4 -Isopropylphenyl group, 4-n-butylphenyl group, 4-n-pentylphenyl group, 4-n-hexylphenyl group, 4-n-decaphenyl group, 4-stearylphenyl group, 9,9'-dihexylfur
- An alkyl-substituted aromatic hydrocarbon group in which the aromatic hydrocarbon group is substituted with an alkyl group having 1 to 18 carbon atoms, such as an oleenyl group;
- An alkenyl-substituted aromatic hydrocarbon group in which the aromatic hydrocarbon group is substituted with an alkenyl group having 2 to 20 carbon atoms, such as a sty
- aromatic hydrocarbon groups such as 4-fluorophenyl group, 2,6-fluorophenyl group, 4-chlorophenyl group, 2,3,4,5,6-perfluorophenyl group are fluorine atom, chlorine atom, bromine
- a halogenated aromatic hydrocarbon group substituted with a halogen such as an atom, 4- (2-ethoxyethyl) phenyl group, 4- (2-n-hexyloxyethyl) phenyl group, 4- (2-n-heptyloxyethyl) phenyl group, 4- (2-n-tetradecyloxyethyl) ) Phenyl group, 4- (2-cyclohexyloxyethyl) phenyl group, 4- (12-ethoxydodecyl) phenyl group, 4- (cyclohexyloxyethyl) phenyl group, etc., the aromatic hydrocarbon group has 3 to 20 carbon atoms.
- An alkylsulfanylalkyl-substituted aromatic hydrocarbon group in which the aromatic hydrocarbon group is substituted with an alkylsulfanylalkyl group having 3 to 20 carbon atoms
- the above aromatic hydrocarbon groups such as 4- (3-octylaminopropyl) phenyl group, 4- (3-dodecylaminopropyl) phenyl group, 4- (diethylaminoethyl) phenyl group, etc. are alkylamino having 3 to 20 carbon atoms.
- alkylaminoalkyl-substituted aromatic hydrocarbon group substituted with an alkyl group are alkylamino having 3 to 20 carbon atoms.
- a halogen such as a fluorine atom, a chlorine atom or a bromine atom, such as a fluoropyridinyl group or a fluoroindolyl group
- alkylsulfanylalkyl-substituted heteroaromatic group in which the aromatic hydrocarbon group is substituted with an alkylsulfanylalkyl group having 3 to 20 carbon atoms, Alkylaminoalkyl having 3 to 20 carbon atoms, such as 5- (3-octylaminopropyl) thienyl group, 5- (3-dodecylaminopropyl) thienyl group, 5- (diethylaminoethyl) thienyl group, etc.
- An alkylaminoalkyl-substituted heteroaromatic group substituted with a group, and the like.
- R 1 or R 2 of the compound represented by the general formula (1) of the present invention is: (I) the substituent represented by the above general formula (2) or general formula (3), or (II) an alkyl group having 2 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkyl group having 2 to 20 carbon atoms having a halogen atom, an alkoxyalkyl group having 3 to 20 carbon atoms, and an alkyl group having 3 to 20 carbon atoms
- Aromatic hydrocarbon group or heteroaromatic group possessed as an aromatic hydrocarbon group or heteroaromatic group having an alkylsulfanylalkyl group having 3 to 20 carbon atoms as a substituent Group, a group selected from aromatic hydrocarbon group or a heteroaromatic group having an alkyl amino alkyl group having 3 to 20 carbon atoms as a substituent,
- alkyl group having 2 to 20 carbon atoms include ethyl, n-propyl, isopropyl, n-butyl, isobutyl, n-pentyl, isopentyl, neopentyl, n-hexyl, and 1-methyl
- alkenyl group having 2 to 20 carbon atoms examples include vinyl group, allyl group, butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, decenyl group, dodecenyl group, tetradecenyl group, hexadecenyl group, octadecenyl group, methylpentenyl group Linear, branched, cyclic alkenyl groups such as cyclohexene, 4-methylcyclohexene,
- alkyl group having 2 to 20 carbon atoms having a halogen atom examples include 2,2,3,3,3-pentafluoropropyl group, 2,2,3,3,4,4,4-heptafluorobutyl group, 2 , 2,3,3,4,4,5,5,5-nonafluoropentyl group, 2,2,3,3,4,4,5,5,6,6,6-undecafluorohexyl
- alkoxyalkyl group having 3 to 20 carbon atoms examples include 2-methoxyethyl group, 2-ethoxyethyl group, 2-n-propoxyethyl group, 2-isopropoxyethyl group, 2-n-butoxyethyl group, 2-n -Hexyloxyethyl group, 2- (2'-ethylbutyloxy) ethyl group, 2-n-heptyloxyethyl group, 2-n-octyloxyethyl group, 2- (2'-ethylhexyloxy) ethyl group, 2 -N-decyloxyethyl group, 2-n-dodecyloxyethyl group, 2-n-tetradecyloxyethyl group, 2-cyclohexyloxyethyl group, 2-methoxypropyl group, 3-methoxypropyl group, 3-ethoxypropyl Group, 3-n-propoxypropyl group,
- alkylsulfanylalkyl group having 3 to 20 carbon atoms examples include alkylsulfanylalkyl groups such as methylsulfanylpropyl group, ethylsulfanylpropyl group, butylsulfanylpropyl group, dodecylsulfanylpropyl group, 2-methylsulfanylethyl group, 2-ethylsulfanyl group Ethyl group, 2-n-propylsulfanylethyl group, 2-isopropylsulfanylethyl group, 2-n-butylsulfanylethyl group, 2-n-hexylsulfanylethyl group, 2- (2′-ethylbutylsulfanyl) ethyl group, 2-n-heptylsulfanylethyl group, 2-n-octylsulfanylethyl group, 2- (2′-ethylhe
- 6-n-propylsulfanylhexyl group 7-n-propylsulfanylheptyl group, 8-n-propylsulfanyloctyl group, 9-n-propylsulfanylnonyl group, 10-n-propylsulfanyldecyl group, 11-ethyl Examples also include a sulfanylundecyl group and an 11-n-propylsulfanylundecyl group.
- alkylaminoalkyl group having 3 to 20 carbon atoms examples include N-methylaminoethyl group, N-ethylaminoethyl group, Nn-propylaminoethyl group, N-isopropylaminoethyl group, and Nn-butylaminoethyl group.
- Nn-hexylaminoethyl group N-2-ethylbutylaminoethyl group, Nn-heptylaminoethyl group, Nn-octylaminoethyl group, N-2-ethylhexylaminoethyl group, N- n-decylaminoethyl group, Nn-dodecylaminoethyl group, Nn-tetradecylaminoethyl group, N-cyclohexylaminoethyl group, N-methylaminopropyl group, N-methylaminopropyl group, N-ethyl Aminopropyl group, Nn-propylaminopropyl group, N-isopropylaminopropyl group, Nn-butyl Minopropyl group, Nn-pentylaminopropyl group, Nn-hexylaminopropyl group, N
- aromatic hydrocarbon group or heteroaromatic group examples include phenyl, naphthyl, azulenyl, acenaphthenyl, anthranyl, phenanthryl, naphthacenyl, fluorenyl, pyrenyl, chrysenyl, perylenyl, biphenyl, p -Terphenyl, quarterphenyl, pyrrolyl, indolyl, furyl, thienyl, imidazolyl, benzofuryl, triazolyl, benzotriazolyl, benzothienyl, pyrazolyl, indolizinyl, quinolinyl, isoquinolinyl Group, carbazolyl group, dibenzofuranyl group, dibenzothiophenyl group, indolinyl group, thiazolyl group, pyridyl group, pyrimidyl group, pyrazinyl group, pyri
- aromatic hydrocarbon group or heteroaromatic group having an alkyl group having 2 to 20 carbon atoms or an alkenyl group having 2 to 20 carbon atoms as a substituent examples include 4-ethylphenyl group, 4-n-propylphenyl group, 4 -Isopropylphenyl group, 4-n-butylphenyl group, 4-n-pentylphenyl group, 4-isopentylphenyl group, 4-n-hexylphenyl group, 4-cyclohexylphenyl group, 4-n-octylphenyl group, 4-n-nonylphenyl group, 4-n-decylphenyl group, 4-n-undecylphenyl group, 4-n-dodecylphenyl group, 4-n-tetradecylphenyl group, 4-n-octadecylphenyl group, 5-n-butyl-2-thienyl group, 5-n-hexyl
- Examples of the aromatic hydrocarbon group or heteroaromatic group having a halogen atom-containing C2-20 alkyl group as a substituent include 4-pentafluoropropylphenyl group, 4-heptafluorobutylphenyl group, 4-nonafluoro group.
- the aromatic hydrocarbon group or heteroaromatic group such as a pentylphenyl group, 4-pentadecafluorooctylphenyl group, 4-nonadecafluorodecylphenyl group, 5-nonafluoropentyl-2-thienyl group, etc.
- Examples of the aromatic hydrocarbon group or heteroaromatic group having an alkoxyalkyl group having 3 to 20 carbon atoms as a substituent include 4- (2-ethoxyethyl) phenyl group and 4- (2-n-hexyloxyethyl) phenyl.
- Examples of the aromatic hydrocarbon group or heteroaromatic group having an alkylsulfanylalkyl group having 3 to 20 carbon atoms as a substituent include 4-methylsulfanylpropylphenyl group, 4-butylsulfanylpropylphenyl group, 4-dodecylsulfanylpropylphenyl group. Group, 5-methylsulfanylpropyl-2-thienyl group, etc., wherein the aromatic hydrocarbon group or heteroaromatic group has an alkylsulfanylalkyl group having 3 to 20 carbon atoms as a substituent.
- Examples of the aromatic hydrocarbon group or heteroaromatic group having an alkylaminoalkyl group having 3 to 20 carbon atoms as a substituent include N-methylaminopropylphenyl group, N-butylaminopropylphenyl group, N-dodecylaminopropylphenyl. Group, N-methylaminopropyl-2-thienyl group or the like, wherein the aromatic hydrocarbon group or heteroaromatic group has an alkylaminoalkyl group having 3 to 20 carbon atoms as a substituent. Group, and the like.
- An aromatic hydrocarbon group or heteroaromatic group having a ⁇ 20 alkylsulfanylalkyl group as a substituent is preferable because it provides high mobility.
- the above (II) is preferably an alkyl group having 2 to 20 carbon atoms, an alkoxyalkyl group having 3 to 20 carbon atoms, or a carbon number of 3 in that it exhibits a high-order liquid crystal phase and suppresses variation in mobility.
- An alkylsulfanylalkyl group having 20 to 20 carbon atoms particularly preferably an alkyl group having 4 to 18 carbon atoms, an alkoxyalkyl group having 4 to 18 carbon atoms, and an alkylsulfanylalkyl group having 4 to 18 carbon atoms.
- the compound of the present invention can be synthesized by a combination of known and commonly used methods.
- An example of a synthetic route can include the following.
- the desired compound is obtained by Sonogashira coupling with an acetylene derivative. Can be obtained.
- the above reaction is not particularly limited, and a known and commonly used reagent can be used, and any known and commonly used reaction temperature can be applied.
- the organic semiconductor material of the present invention obtained as described above is crystallized via a high-order liquid crystal phase with high order of molecular arrangement, and the arrangement of molecules is controlled after film formation. Express degree. In particular, it has a carbon-carbon triple bond that does not interfere with the liquid crystal phase, has high molecular arrangement, and has less mobility variation between elements than conventional compounds, so it is useful for various organic semiconductor devices. is there.
- the liquid crystal phase represented by the compound of the present invention is preferably a liquid crystal phase selected from the group consisting of SmB, SmBcryst, SmI, SmF, SmE, SmJ, SmG, SmK, and SmH. This is because when the liquid crystal material according to the present invention is used as an organic semiconductor in a liquid crystal phase, these liquid crystal phases have low fluidity, so that ionic conduction is difficult to induce, and because the molecular alignment order is high, high movement in the liquid crystal phase. This is because the degree can be expected.
- liquid crystal substance according to the present invention when used as an organic semiconductor in a crystal phase, these liquid crystal phases are less fluid than N phase, SmA phase, and SmC phase, so that the liquid crystal phase is increased by increasing the temperature. This is because the element is not easily destroyed even when it is transferred to.
- the liquid crystal phase appears only in the temperature lowering process, once crystallized, the crystal temperature region is widened, which is convenient for application in the crystal phase.
- the compound of the present invention is characterized by showing a phase of SmBcryst, SmE, SmF, SmI, SmJ, SmG, SmK, or SmH in the temperature lowering process.
- SmBcryst when SmE, SmF, SmI, SmJ, SmG, SmK, or SmH, when SmE, SmG, which is a higher-order Sm phase, raises the temperature of the organic semiconductor material from the crystal phase, Particularly preferred as a liquid crystal phase appearing in a temperature region adjacent to the liquid crystal phase.
- a liquid crystal substance in which a high-order liquid crystal phase appears in addition to a liquid-like low-order liquid crystal phase N phase, SmA phase, or SmC phase
- N phase, SmA phase, or SmC phase has high liquidity in the low-order liquid crystal phase.
- the molecules are pre-aligned in the lower-order liquid crystal phase and then transferred to the higher-order liquid crystal phase. Since a liquid crystal thin film with few defects can be obtained, the quality of the liquid crystal thin film or the crystal thin film can be improved.
- an operating temperature required for a device using the liquid crystal material is usually ⁇ 20 ° C. to 80 ° C. Therefore, in the present invention, SmBcryst, SmE, SmF, SmI, SmJ, SmG, SmK, or The temperature range where the SmH phase appears is required to be ⁇ 20 ° C. or higher.
- the liquid crystal substance according to the present invention is used as an organic semiconductor in a crystal phase, it is effective to improve the quality by using a thin film in a liquid crystal state (liquid crystal thin film) as a precursor for producing a crystal thin film. For this reason, considering the simplicity of the process and the ease of selection of the substrate, the temperature at which the liquid crystal phase of the liquid crystal material appears is preferably 200 ° C. or lower.
- the BTBT skeleton of the present invention is effective as the unit.
- the liquid crystal phase is not stabilized, and generally, the liquid crystal phase is not developed, or even if the liquid crystal phase is developed, only a low-order liquid crystal phase such as the SmA phase is developed (Liquid Crystal Crystal. Vol. 34. No. 9 (2007) 1001-1007. Liquid Crystal.Vol.30.No.5 (2003) 603-610).
- a high-order liquid crystal can be obtained by adopting a molecular structure in the core part that connects another structural unit to give the degree of freedom of flip-flop motion of the molecule to the charge transporting molecular unit like the BTBT skeleton. Realization of high mobility in the liquid crystal phase is expected.
- a hydrocarbon chain is connected to the structure (core part) in which another rigid structural unit such as an arylene acetylene structure is connected to the BTBT skeleton to give the molecule anisotropy and liquidity in a rod-like molecular shape. Therefore, the liquid crystal phase can be induced with a high probability.
- a liquid crystal phase can often be developed. In this case, in general, the appearance temperature region of the liquid crystal phase is often asymmetric between the temperature lowering process and the temperature increasing process.
- This characteristic means that when a polycrystalline thin film of a liquid crystal material is used as an organic semiconductor, the liquid crystal thin film can be produced at a lower temperature when the polycrystalline thin film is produced using the liquid crystal thin film (thin liquid crystal phase thin film) as a precursor.
- the fact that the crystal phase temperature in the temperature rising process spreads to a high region means that the thermal stability of the produced polycrystalline film is improved, which is convenient as a material.
- the developed liquid crystal phase is generally stabilized, which is convenient for application to a device using the liquid crystal phase.
- the usefulness of the substance according to the present invention basically exhibits a higher-order smectic phase when used as an organic semiconductor in a liquid crystal phase.
- the usefulness of the substance according to the present invention when used as an organic semiconductor in the crystalline phase, it is difficult to form cracks or voids in the crystalline thin film when cooled from a temperature higher than the crystalline phase temperature, and a low-order liquid crystal phase is expressed adjacent to the crystalline phase. It is made use of by choosing what does not.
- a liquid crystal phase other than a nematic phase, SmA phase, or SmC phase is expressed in a temperature region adjacent to the crystal phase, or when used as an organic semiconductor in a crystal phase.
- the criterion is that cracks and voids are less likely to form when cooled to a crystalline phase after cooling from a higher temperature range than the crystalline phase.
- a black area (generally round) similar to the presence of air is generated locally, but the black lines and areas generated by crystallization appear distributed in the tissue and at the boundary so that they can be easily distinguished. it can. These can be easily distinguished from other tissues found in the texture because no disappearance or color change is observed even when the polarizer and the analyzer are rotated.
- the temperature at which this texture appears is defined as the crystallization temperature, and it is confirmed that the texture appearing in a temperature region higher than that temperature is not a nematic phase, SmA phase, or SmC phase.
- a characteristic schlieren texture expressed as a pincushion (a typical schlieren texture) is observed, and when it shows an SmA phase or an SmC phase, it has a fan shape called a fan-like texture. Since a characteristic texture having a uniform structure (a typical Fan-like texture) is observed in the region, it can be easily determined from the characteristic texture.
- the visual field changes instantaneously at the phase transition temperature, but the phase transition texture almost changes.
- the texture of the formed SmB phase, SmF phase, and SmI phase may be mistaken for the SmA phase and the SmC phase, so care should be taken.
- the energy levels of the HOMO and LUMO of the core part are also important.
- the HOMO level of an organic semiconductor is determined by dissolving a test substance in a dehydrated organic solvent such as dichloromethane to a concentration of, for example, 1 mmol / L to 10 mmol / L, and adding a supporting electrolyte such as a tetrabutylammonium salt.
- the HOMO level and LUMO level can be estimated from the difference between the peak potential and the reference potential, for example, a known substance such as ferrocene. If the HOMO level and LUMO level are outside the potential window of the organic solvent used, the HOMO-LUMO level is calculated from the absorption edge of the UV-visible absorption spectrum and subtracted from the measured level. Can be estimated. This method is described in J. Org. Pommerehne, H.C. Vestweber, W.W. Guss, R.D. F. Mahrt, H.H. Bassler, M.M. Porsch, and J.M. Daub, Adv. Mater. , 7, 551 (1995).
- the HOMO and LUMO levels of an organic semiconductor material provide a measure of electrical contact with the anode and cathode, respectively, and charge injection is limited by the size of the energy barrier determined by the difference from the work function of the electrode material. So be careful.
- the work function of a metal is often silver (Ag) 4.0 eV, aluminum (Al) 4.28 eV, gold (Au) 5.1 eV, calcium (Ca) 2.87 eV, as examples of materials used as electrodes.
- the work function difference between the organic semiconductor material and the electrode substance is preferably 1 eV or less, more preferably 0.8 eV or less. More preferably, it is 0.6 eV or less.
- the work function of the metal the following documents can be referred to as necessary. Reference D: Chemical Handbook Basic Edition Revised 5th Edition II-608-610 14.1 b Work Function (Maruzen Publishing Co., Ltd.) (2004)
- the size of the conjugated system can be used as a reference when selecting materials.
- Applicable organic semiconductor devices include diodes, organic transistors, memories, photodiodes, light emitting diodes, light emitting transistors, sensors such as gas sensors, biosensors, blood sensors, immune sensors, artificial retinas, taste sensors, RFID, etc. Is mentioned.
- the organic-semiconductor material of this invention has a high charge mobility of 0.1 cm ⁇ 2 > / Vs or more, the application to an organic transistor or a light-emitting device is especially useful.
- the organic transistor can be suitably used as a switching transistor, a signal driver circuit element, a memory circuit element, a signal processing circuit element, or the like of a pixel constituting the display.
- Examples of the display include a liquid crystal display, a dispersive liquid crystal display, an electrophoretic display, a particle rotating display element, an electrochromic display, an organic electroluminescence display, and electronic paper.
- an organic transistor usually has a source electrode, a drain electrode and a gate electrode, a gate insulating layer, and an organic semiconductor layer, and there are various types of transistors depending on the arrangement of each electrode and each layer.
- the organic semiconductor material of the present invention is not limited to the type of transistor, and can be used for any transistor.
- Examples of transistors reference can be made to Aldrich Basic Material Science No. 6 “Basics of Organic Transistors”.
- the mobility in the present invention is the mobility of carriers such as holes and electrons, and serves as an index representing the performance of the organic semiconductor material.
- the mobility includes mobility by the TOF (Time-of-Flight) method ( ⁇ TOF : unit cm 2 / V ⁇ s) and mobility determined by the organic transistor ( ⁇ FET : unit cm 2 / V ⁇ s).
- ⁇ TOF and ⁇ FET are, as ⁇ TOF and ⁇ FET is high, will be easy carriers flow.
- the mobility ( ⁇ TOF ) is obtained by the following formula (i), where V is the voltage between the electrodes of the TOF measurement cell, d is the distance between the electrodes, and Tr is the time crossing the film thickness calculated from the photocurrent waveform. It is done.
- the mobility (mu FET) is a drain voltage V D is fixed, with the curve of the transmission characteristics obtained by varying the gate voltage V G, it is obtained by the following formula (ii).
- C in is the electric capacity per unit area of the gate insulating film
- ID is the drain current
- L is the channel length
- W is the channel width
- V TH is the threshold voltage.
- the liquid crystalline material exhibits a crystal phase like the non-liquid crystal material, it goes without saying that when the liquid crystal material is used as an organic semiconductor, it can be used not only in the liquid crystal phase but also in the crystalline phase as an organic semiconductor.
- the mobility in the crystal phase is often about half to one digit higher than the mobility in the liquid crystal phase.
- transistor applications that require high mobility and large diffusion lengths of charges and excitons. Crystals are required for applications such as solar cells. Use of phases is effective.
- Organic semiconductor ink The organic semiconductor material of the present invention may be vapor-deposited to form a semiconductor film, but is preferably used as a printing ink that can be formed at a low temperature and has excellent productivity.
- the organic semiconductor material of the present invention is dissolved in a solvent, and a leveling agent such as a fluorine-based material or a silicon-based material is added to the extent that the semiconductor performance is not impaired.
- a leveling agent such as a fluorine-based material or a silicon-based material is added to the extent that the semiconductor performance is not impaired.
- Polymer compounds such as resins can also be added as viscosity modifiers. Any organic solvent may be used, or two or more organic solvents may be mixed and used.
- aliphatic solvents such as n-hexane, n-octane, n-decane, and n-dodecane
- alicyclic solvents such as cyclohexane
- Aromatic solvents such as tetrahydrofuran, dioxane, ethylene glycol diethyl ether, anisole, benzyl ethyl ether, ethyl phenyl ether, diphenyl ether, methyl-t-butyl ether; methyl acetate, ethyl acetate, ethyl cellosolve, propylene glycol methyl ether Ester solvents such as acetate; alcohol solvents such as methanol, ethanol and isopropanol; ketone solvents such as acetone, methyl ethyl ketone, cyclohexanone, 2-hexanone, 2-heptanone and 3-heptanone; other dimethylformamide, dimethyl sulfoxide, diethylformamide However, it is not limited to these.
- the concentration of the organic semiconductor material of the present invention in the prepared liquid composition is preferably 0.01 to 20% by weight, and more preferably 0.1 to 10% by weight.
- One type of organic solvent may be used, but a plurality of types of solvents may be mixed and used in order to obtain a desired thin film with high homogeneity.
- An organic transistor usually includes a source electrode, a drain electrode and a gate electrode, a gate insulating layer, and an organic semiconductor layer, and there are various types of transistors depending on the arrangement of each electrode and each layer.
- the organic semiconductor material is not limited to the type of transistor and can be used for any transistor.
- Aldrich Basic Material Science No. 6 “Basics of Organic Transistors”. Referring to the bottom contact type shown in FIG. 1 as an example, 1 is a substrate, 2 is a gate electrode, 3 is a gate insulating layer, 4 is an organic semiconductor, 5 is a source electrode, and 6 is a drain electrode.
- the substrate is made of glass or a flexible resin sheet.
- a plastic film can be used as the sheet.
- the plastic film include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polyetherimide, polyetheretherketone, polyphenylene sulfide, polyarylate, polyimide, polycarbonate (PC).
- TAC cellulose triacetate
- CAP cellulose acetate propionate
- the electrode material of the gate electrode, source electrode, or drain electrode is not particularly limited as long as it is a conductive material. Platinum, gold, silver, nickel, chromium, copper, iron, tin, tin oxide / antimony, indium tin oxide (ITO), fluorine-doped zinc oxide, carbon, graphite, glassy carbon, silver paste and carbon paste, lithium, beryllium, sodium, magnesium, potassium, calcium, scandium, titanium, manganese, zirconium, gallium, niobium, sodium, sodium Potassium alloy, magnesium, lithium, aluminum, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, aluminum / aluminum oxide mixture, lithium / aluminum
- a metal electrode such as a compound is used, but a known conductive polymer whose conductivity is improved by doping or the like, for example, conductive polyaniline, conductive polypyrrole, conductive polythiophene, a complex of polyethylenedioxythiophene
- a method for forming an electrode a method for forming an electrode using a known photolithographic method or a lift-off method, using a conductive thin film formed by a method such as vapor deposition or sputtering using the above as a raw material, or a metal foil such as aluminum or copper
- a method of etching using a resist by thermal transfer, ink jet or the like Alternatively, a conductive polymer solution or dispersion, or a conductive fine particle dispersion may be directly patterned by ink jetting, or may be formed from a coating film by lithography or laser ablation.
- a method of patterning an ink containing a conductive polymer or conductive fine particles, a conductive paste, or the like by a printing method such as relief printing, intaglio printing, planographic printing, or screen printing can also be used.
- Gate insulating layer is a thermoplastic resin such as parylene, polystyrene, acrylic resin, polyester resin; thermosetting resin such as epoxy resin, urethane resin, phenol resin, unsaturated polyester resin, alkyd resin, melamine resin; UV curable resin
- An organic thin film such as a silicon oxide film can be preferably used, but an inorganic material such as a silicon oxide film can also be used.
- the gate insulating layer is formed by a spin coating method, a casting method, a dipping method, an ink jet method, a doctor blade method, a screen printing method, an offset printing method, a letterpress printing method, a reverse printing method, a micro contact printing method, a wire bar coating method, a spray coating method.
- the thin film can be formed by a known wet film forming method such as a dispensing method, and may be patterned into a necessary shape by a photolithographic method, if necessary.
- the organic semiconductor layer can be produced by a known and common production method such as a vacuum deposition method, but the organic semiconductor layer can be easily formed by a printing method using the composition as an ink for an organic semiconductor material.
- Examples of printing methods include spin coating, casting, dipping, inkjet, doctor blade, gravure printing, screen printing, offset printing, letterpress printing, reverse printing, microcontact printing,
- a thin film can be produced by a known wet film formation method such as a wire bar coating method, a spray coating method, or a dispensing method. Further, depending on the casting method or the like, it is possible to take a form of a flat crystal or a thick film state.
- the organic transistor of the present invention can be suitably used as a switching transistor, a signal driver circuit element, a memory circuit element, a signal processing circuit element, or the like of a pixel constituting a display.
- Examples of the display include a liquid crystal display, a dispersive liquid crystal display, an electrophoretic display, a particle rotating display element, an electrochromic display, an organic electroluminescence display, and electronic paper.
- Applicable organic semiconductor devices include diodes, organic transistors, memories, photodiodes, light emitting diodes, light emitting transistors, sensors such as gas sensors, biosensors, blood sensors, immune sensors, artificial retinas, taste sensors, RFID, etc. Is mentioned.
- a silicon wafer with a thermal oxide film (heavy doped p-type silicon (P + -Si), thermal oxide film (SiO2) thickness: 300 nm) is cut into 20 ⁇ 25 mm, and then this cut silicon wafer (hereinafter abbreviated as substrate) is used.
- the liquid crystalline organic semiconductor compound was dissolved in xylene to prepare a solution. The concentration of the solution was 1 wt% to 0.5 wt%.
- the evaluation of the fabricated organic transistor was conducted by applying a sweep current to the gate electrode (P + -Si) using a source / measurement unit with two power supplies under normal atmospheric conditions.
- the measurement (transfer characteristic) was performed while (Vsg: +40 to ⁇ 60 V) (source-drain voltage Vsd: ⁇ 80 V).
- the mobility was calculated from the slope of ⁇ Id ⁇ Vg in the transfer characteristic by a well-known method using a saturation characteristic equation.
- Example 1 4.96 g (13 mmol) of 2-decyl-BTBT obtained by the method described in Liquid Crystals 31, 137-1380 (2004) was dissolved in 320 mL of dichloromethane, cooled to ⁇ 50 ° C., and fuming nitric acid in 1.2 M dichloromethane solution 24 mL was added dropwise over 30 minutes. After further stirring at ⁇ 50 ° C. for 2 hours, 26 mL of saturated aqueous sodium hydrogen carbonate solution was added to stop the reaction. The lower layer was separated by separation, washed with 10% brine, dried over anhydrous magnesium sulfate and concentrated to dryness to obtain a crude solid. This solid was recrystallized from 2-butanone to obtain 3.72 g (yield, 67%) of yellow crystals of 2-decyl-7-nitroBTBT.
- Example 2 2-Idecyl-7-iodoBTBT (253 mg, 0.5 mmol) obtained in Example 1 was added to copper iodide (0.11 g, 0.6 mmol), bis (triphenylphosphine) palladium (II) dichloride (0. 08 g, 0.1 mmol) and 36 mL of triethylamine were added, and nitrogen gas was bubbled for 15 minutes at room temperature. Under a nitrogen atmosphere, 0.55 g (5.4 mmol) of ethynylbenzene was added, the temperature was raised to 35 ° C., and the mixture was heated and stirred for 30 minutes. Then, after heating up to 85 degreeC, it heated and stirred for 40 hours.
- the reaction solution was added to 250 mL of water.
- the produced solid was collected by filtration and washed with 100 mL of acetone.
- the obtained solid was dissolved in 500 mL of cyclohexane heated to 50 ° C., and 2 g of silica gel and 2 g of a metal scavenger were added to this solution to prepare a slurry.
- the silica gel and the metal scavenger were removed by filtration and recrystallized from the filtrate, whereby 178 mg (yield 74%) of white crystals of BTBT derivative b represented by Got.
- Example 3 In Example 2, the same operation as in Example 2 was performed, except that 0.55 g (5.4 mmol) of ethynylbenzene was replaced with 0.82 g (5.4 mmol) of 2-ethynylnaphthalene. As a result, 197 mg (yield 74%) of white crystals of BTBT derivative c were obtained.
- Example 5 In Example 2, the same operation as in Example 2 was carried out except that 0.55 g (5.4 mmol) of ethynylbenzene was replaced with 0.58 g (5.4 mmol) of 3-ethynylthiophene. As a result, 147 mg (yield 60%) of white crystals of BTBT derivative e were obtained.
- Example 6 In Example 2, the same operation as in Example 2 was performed, except that 0.55 g (5.4 mmol) of ethynylbenzene was replaced with 1.05 g (5.4 mmol) of 1-ethynyl-4-phenoxybenzene.
- Example 7 In Example 2, the same operation as in Example 2 was carried out except that 0.55 g (5.4 mmol) of ethynylbenzene was replaced with 0.63 g (5.4 mmol) of 4-ethynyltoluene. As a result, 94 mg (yield 38%) of white crystals of BTBT derivative g were obtained.
- Example 9 In Example 2, the same operation as in Example 2 was performed, except that 0.55 g (5.4 mmol) of ethynylbenzene was replaced with 1-ethynyl-4-t-butylbenzene g (5.4 mmol).
- Example 12 In Example 2, the same operation as in Example 2 was carried out except that 0.55 g (5.4 mmol) of ethynylbenzene was replaced with 0.56 g (5.4 mmol) of 3-ethynyl-pyridine. As a result, 44 mg (yield 18%) of white crystals of BTBT derivative 1 were obtained.
- Example 13 First, BTBT (6 g, 25 mmol) was added to 300 mL of dichloromethane, and the mixture was stirred until it reached ⁇ 10 ° C. in a nitrogen gas atmosphere. Next, aluminum chloride (13.3 g, 0.1 mol) was added, and the temperature was lowered to -70 ° C. After reaching ⁇ 70 ° C., tetradecanoic acid chloride (6.9 g, 25 mmol) was added dropwise over 20 minutes and stirred for 3.5 hours. After adding the reaction solution to 600 g of water, 200 g of dichloromethane was added and transferred to a separatory funnel.
- 2-tetradecyl-BTBT (8.5 g, 19.5 mmol) was added to chloroform (150 mL) and acetic acid (150 mL), and the mixture was stirred at room temperature in a nitrogen gas atmosphere. Bromine (3.9 g, 24.4 mmol) was added dropwise over 20 minutes. did. Thereafter, the reaction was stopped by stirring for 10 hours. 200 mL of water was added, liquid separation was performed, the lower layer was taken, and concentrated to dryness to obtain a crude solid. This solid was recrystallized from acetone to obtain 5.82 g (yield, 58%) of white crystals of 2-tetradecyl-7-bromoBTBT.
- 2-tetradecyl-7-bromoBTBT (258 mg, 0.5 mmol) and copper iodide (0.11 g, 0.6 mmol), bis (triphenylphosphine) palladium (II) dichloride (0.08 g, .0. 1 mmol) and 36 mL of triethylamine were added, and nitrogen gas was bubbled for 15 minutes at room temperature. Under a nitrogen atmosphere, 0.55 g (5.4 mmol) of ethynylbenzene was added, the temperature was raised to 35 ° C., and the mixture was heated and stirred for 30 minutes. Then, after heating up to 85 degreeC, it heated and stirred for 40 hours.
- the reaction solution was added to 250 mL of water.
- the produced solid was collected by filtration and washed with 100 mL of acetone.
- the obtained solid was dissolved in 500 mL of cyclohexane heated to 50 ° C., and 2 g of silica gel and 2 g of a metal scavenger were added to this solution to prepare a slurry.
- the silica gel and the metal scavenger were removed by filtration and recrystallized from the filtrate, whereby 180 mg of white crystals of the BTBT derivative m represented by (Chemical Formula 27) (yield 67%) Got.
- Example 15 In Example 13, the same procedure as in Example 13 was performed, except that 0.93 g (5.4 mmol) of 1-ethynyl-4-pentylbenzene was used instead of 0.55 g (5.4 mmol) of ethynylbenzene. Thus, 162 mg (yield 53%) of white crystals of BTBT derivative o represented by (Chemical Formula 29) were obtained.
- Example 16 First, BTBT (6 g, 25 mmol) was added to 300 mL of dichloromethane, and the mixture was stirred until it reached ⁇ 10 ° C. in a nitrogen gas atmosphere. Next, aluminum chloride (13.3 g, 0.1 mol) was added, and the temperature was lowered to -70 ° C. After reaching ⁇ 70 ° C., octanoic acid chloride (3.8 g, 25 mmol) was added dropwise over 20 minutes and stirred for 3.5 hours. After adding the reaction solution to 600 g of water, 200 g of dichloromethane was added and transferred to a separatory funnel. The lower layer was separated and washed twice with 300 g of water, and then the organic layer was concentrated.
- 2-octyl-7-bromoBTBT (216 mg, 0.5 mmol) was added to copper iodide (0.11 g, 0.6 mmol), bis (triphenylphosphine) palladium (II) dichloride (0.08 g, .0. 1 mmol) and 36 mL of triethylamine were added, and nitrogen gas was bubbled for 15 minutes at room temperature. Under a nitrogen atmosphere, 0.93 g (5.4 mmol) of 1-ethynyl-4-pentylbenzene was added, and the temperature was raised to 35 ° C., followed by heating and stirring for 30 minutes. Then, after heating up to 85 degreeC, it heated and stirred for 40 hours.
- the reaction solution was added to 250 mL of water.
- the produced solid was collected by filtration and washed with 100 mL of acetone.
- the obtained solid was dissolved in 500 mL of cyclohexane heated to 50 ° C., and 2 g of silica gel and 2 g of a metal scavenger were added to this solution to prepare a slurry.
- the silica gel and the metal scavenger were removed by filtration and recrystallized from the filtrate.
- Example 17 First, BTBT (6 g, 25 mmol) was added to 300 mL of dichloromethane, and the mixture was stirred until it reached ⁇ 10 ° C. in a nitrogen gas atmosphere. Next, aluminum chloride (13.3 g, 0.1 mol) was added, and the temperature was lowered to -70 ° C. After reaching ⁇ 70 ° C., hexanoic acid chloride (3.37 g, 25 mmol) was added dropwise over 20 minutes and stirred for 3.5 hours. After adding the reaction solution to 600 g of water, 200 g of dichloromethane was added and transferred to a separatory funnel. The lower layer was separated and washed twice with 300 g of water, and then the organic layer was concentrated.
- 2-hexyl-7-bromoBTBT (202 mg, 0.5 mmol) and copper iodide (0.11 g, 0.6 mmol), bis (triphenylphosphine) palladium (II) dichloride (0.08 g, .0. 1 mmol) and 36 mL of triethylamine were added, and nitrogen gas was bubbled for 15 minutes at room temperature. Under a nitrogen atmosphere, 0.55 g (5.4 mmol) of ethynylbenzene was added, the temperature was raised to 35 ° C., and the mixture was heated and stirred for 30 minutes. Then, after heating up to 85 degreeC, it heated and stirred for 40 hours.
- the reaction solution was added to 250 mL of water.
- the produced solid was collected by filtration and washed with 100 mL of acetone.
- the obtained solid was dissolved in 500 mL of cyclohexane heated to 50 ° C., and 2 g of silica gel and 2 g of a metal scavenger were added to this solution to prepare a slurry.
- the silica gel and the metal scavenger were removed by filtration and recrystallized from the filtrate to obtain 175 mg (yield 83%) of white crystals of the BTBT derivative q represented by Got.
- Example 19 In Example 17, the same procedure as in Example 17 was performed, except that 0.93 g (5.4 mmol) of 1-ethynyl-4-pentylbenzene was used instead of 0.55 g (5.4 mmol) of ethynylbenzene. Thus, 114 mg (yield 46%) of white crystals of the BTBT derivative s represented by (Chemical Formula 33) were obtained.
- Example 21 First, BTBT (6 g, 25 mmol) was added to 300 mL of dichloromethane, and the mixture was stirred until it reached ⁇ 10 ° C. in a nitrogen gas atmosphere. Next, aluminum chloride (13.3 g, 0.1 mol) was added, and the temperature was lowered to -70 ° C. After reaching ⁇ 70 ° C., 10-bromodecanoic acid chloride (6.73 g, 25 mmol) was added dropwise over 20 minutes and stirred for 3.5 hours. After adding the reaction solution to 600 g of water, 200 g of dichloromethane was added and transferred to a separatory funnel. The lower layer was separated and washed twice with 300 g of water, and then the organic layer was concentrated.
- 2- (10-bromodecyl) -7-bromoBTBT (2.16 g, 4 mmol) was added to copper iodide (0.88 g, 4.8 mmol), bis (triphenylphosphine) palladium (II) dichloride (0. 64 g, 0.8 mmol) and 280 mL of triethylamine were added, and nitrogen gas was bubbled for 15 minutes at room temperature.
- 4.4 g (43 mmol) of ethynylbenzene was added, the temperature was raised to 35 ° C., and the mixture was heated and stirred for 30 minutes. Then, after heating up to 85 degreeC, it heated and stirred for 40 hours.
- the reaction solution was added to 1 L of water.
- the produced solid was collected by filtration and washed with 300 mL of acetone.
- the obtained solid was dissolved in 800 mL of cyclohexane heated to 50 ° C., and 15 g of silica gel and 15 g of a metal scavenger were added to this solution to prepare a slurry.
- the silica gel and metal scavenger were removed by filtration and recrystallized from the filtrate to obtain 1.45 g of white crystals of 2- (10-bromodecyl) -7-phenylethynyl BTBT (yield). 65%) was obtained.
- Example 22 While stirring 2- (10-bromodecyl) -7-phenylethynyl BTBT (447 mg, 0.8 mmol), amyl alcohol 10 mL, dehydrated THF 20 mL, and dehydrated DMF 12 mL obtained in Example 21 at room temperature in a nitrogen atmosphere, molecular sieves 4A (0.5 g) and cesium hydroxide monohydrate (274 mg, 1.6 mmol) were added, and the mixture was further stirred for 24 hours. Chloroform 100mL was added to the reaction liquid, it filtered, the filtrate was wash
- Examples 23 to 44 The results of transistor evaluation of the BTBT derivatives a to v obtained in Examples 1 to 22 by the method described above are shown in Table 1, and the results of observing the liquid crystal phase are shown in FIGS.
- the organic semiconductor material of the present invention exhibits a high-order liquid crystal phase, and thus provides a transistor element with practical mobility and small mobility variation.
- the compound of the comparative example does not develop a high-order liquid crystal phase, has low mobility in transistor characteristics, and has a large mobility error.
- the compound of the present invention can be used as an organic semiconductor, and can be used for an organic transistor using the organic semiconductor material as an organic semiconductor layer.
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Abstract
Description
1. 一般式(1)
(II)炭素数2~20のアルキル基、炭素数2~20のアルケニル基、ハロゲン原子を有する炭素数2~20のアルキル基、炭素数3~20のアルコキシアルキル基、炭素数3~20のアルキルスルファニルアルキル基、炭素数3~20のアルキルアミノアルキル基、芳香族炭化水素基又は複素芳香族基、及び、
炭素数1~20のアルキル基、炭素数2~20のアルケニル基、ハロゲン原子を有する炭素数1~20のアルキル基、炭素数3~20のアルコキシアルキル基、炭素数3~20のアルキルスルファニルアルキル基、又は炭素数3~20のアルキルアミノアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、
から選ばれる基)
で表されるベンゾチエノベンゾチオフェン誘導体、
2. 下記一般式(4)
R2-は、炭素数2~20のアルキル基、炭素数2~20のアルケニル基、ハロゲン原子を有する炭素数2~20のアルキル基、炭素数3~20のアルコキシアルキル基、炭素数3~20のアルキルスルファニルアルキル基、炭素数3~20のアルキルアミノアルキル基、芳香族炭化水素基又は複素芳香族基、及び、
炭素数1~20のアルキル基、炭素数2~20のアルケニル基、ハロゲン原子を有する炭素数1~20のアルキル基、炭素数3~20のアルコキシアルキル基、炭素数3~20のアルキルスルファニルアルキル基、又は炭素数3~20のアルキルアミノアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、
から選ばれる基)
で表される1.に記載のベンゾチエノベンゾチオフェン誘導体。
3. 1.又は2.に記載のベンゾチエノベンゾチオフェン誘導体を用いた有機半導体材料、
4.3.に記載の有機半導体材料を含有する有機半導体インキ、
5.3.に記載の有機半導体材料を含有する有機半導体膜、
6.3.に記載の有機半導体材料を用いてなる有機半導体デバイス、
7.3.に記載の有機半導体材料を有機半導体層として用いる有機トランジスタ。
一般式(1)で表される化合物は、BTBT骨格に置換基を有する化合物であり、少なくとも一方が、特定のアリーレンアセチレン構造からなる一般式(2)または(3)の基であり、もう一方が、炭素数2~20のアルキル基、炭素数2~20のアルケニル基、ハロゲン原子を有する炭素数2~20のアルキル基、炭素数3~20のアルコキシアルキル基、炭素数3~20のアルキルスルファニルアルキル基、炭素数3~20のアルキルアミノアルキル基、芳香族炭化水素基又は複素芳香族基、炭素数2~20のアルキル基または炭素数2~20のアルケニル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、ハロゲン原子を有する炭素数2~20のアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、炭素数3~20のアルコキシアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、炭素数3~20のアルキルスルファニルアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、炭素数3~20のアルキルアミノアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、一般式(2)または一般式(3)の基から選ばれる基であることに特徴を有する。
本発明の一般式(1)で表される化合物のR1またはR2の少なくとも一方が、
(I)一般式(2)または一般式(3)で表される置換基である。
スチリル基、4-ブテニルフェニル基、4-オクタデセニルフェニル基など、前記の芳香族炭化水素基が炭素数2~20のアルケニル基で置換されたアルケニル置換芳香族炭化水素基、
4-(2-エトキシエチル)フェニル基、4-(2-n-ヘキシルオキシエチル)フェニル基、4-(2-n-ヘプチルオキシエチル)フェニル基、4-(2-n-テトラデシルオキシエチル)フェニル基、4-(2-シクロヘキシルオキシエチル)フェニル基、4-(12-エトキシドデシル)フェニル基、4-(シクロヘキシルオキシエチル)フェニル基など、前記芳香族炭化水素基が炭素数3~20のアルコキシアルキル基で置換されたアルコキシアルキル置換芳香族炭化水素基、
4-(メチルスルファニルプロピル)フェニル基、4-(2-n-ヘキシルスルファニルエチル)フェニル基、4-(3-n-デシルスルファニルプロピル)フェニル基、4-(シクロヘキシルスルファニルプロピル)フェニル基など、前記の芳香族炭化水素基が炭素数3~20のアルキルスルファニルアルキル基で置換されたアルキルスルファニルアルキル置換芳香族炭化水素基、
4-(3-オクチルアミノプロピル)フェニル基、4-(3-ドデシルアミノプロピル)フェニル基、4-(ジエチルアミノエチル)フェニル基など、前記の芳香族炭化水素基が炭素数3~20のアルキルアミノアルキル基で置換されたアルキルアミノアルキル置換芳香族炭化水素基、などが挙げられる。
5-メチルチエニル基、5-ヘキシルチエニル基、5-デカチエニル基、5-ステアリルチエニル基など前記複素芳香族基が炭素数1~20のアルキル基で置換されたアルキル置換複素芳香族基、
5-(2-エトキシエチル)チエニル基、5-(2-n-テトラデシルオキシエチル)チエニル基、5-(2-シクロヘキシルオキシエチル)チエニル基、5-(12-エトキシドデシル)チエニル基など、前記芳香族炭化水素基が炭素数3~20のアルコキシアルキル基で置換されたアルコキシアルキル置換複素芳香族基、
5-(3-オクチルアミノプロピル)チエニル基、5-(3-ドデシルアミノプロピル)チエニル基、5-(ジエチルアミノエチル)チエニル基など、前記の複素芳香族基が炭素数3~20のアルキルアミノアルキル基で置換されたアルキルアミノアルキル置換複素芳香族基、などが挙げられる。
トリレン基、キシリレン基、エチルフェニレン基、プロピルフェニレン基、ブチルフェニレン基、メチルナフチレン、9,9‘-ジヘキシルフルオレニレン基など、前記芳香族炭化水素基が炭素数1~10のアルキル基で置換されたアルキル置換芳香族炭化水素基、
更に、チエニレン、ピリジレンなどの複素芳香族基や、これらが置換された複素芳香族基も使用することができる。
炭素数1~20のアルキル基としては、メチル基、エチル基、n-プロピル基、イソプロピル基、n-ブチル基、イソブチル基、n-ペンチル基、イソペンチル基、ネオペンチル基、n-ヘキシル基、1-メチルペンチル基、4-メチル-2-ペンチル基、3,3-ジメチルブチル基、2-エチルブチル基、n-ヘプチル基、1-メチルヘキシル基、シクロヘキシルメチル基、n-オクチル基、tert-オクチル基、1-メチルヘプチル基、2-エチルヘキシル基、2-プロピルペンチル基、n-ノニル基、2,2-ジメチルヘプチル基、2,6-ジメチル-4-ヘプチル基、3,5,5-トリメチルヘキシル基、n-デシル基、n-ウンデシル基、1-メチルデシル基、n-ドデシル基、n-トリデシル基、1-ヘキシルヘプチル基、n-テトラデシル基、n-ペンタデシル基、n-ヘキサデシル基、n-ヘプタデシル基、n-オクタデシル基、n-エイコシル基、シクロペンチル基、シクロヘキシル基、4-メチルシクロヘキシル基、シクロヘプチル基、シクロオクチル基などの直鎖、分岐または環状のアルキル基、
スチリル基、4-ブテニルフェニル基、4-オクタデセニルフェニル基など、前記の芳香族炭化水素基が炭素数2~20のアルケニル基で置換されたアルケニル置換芳香族炭化水素基、
4-(2-エトキシエチル)フェニル基、4-(2-n-ヘキシルオキシエチル)フェニル基、4-(2-n-ヘプチルオキシエチル)フェニル基、4-(2-n-テトラデシルオキシエチル)フェニル基、4-(2-シクロヘキシルオキシエチル)フェニル基、4-(12-エトキシドデシル)フェニル基、4-(シクロヘキシルオキシエチル)フェニル基など、前記芳香族炭化水素基が炭素数3~20のアルコキシアルキル基で置換されたアルコキシアルキル置換芳香族炭化水素基、
4-(3-オクチルアミノプロピル)フェニル基、4-(3-ドデシルアミノプロピル)フェニル基、4-(ジエチルアミノエチル)フェニル基など、前記の芳香族炭化水素基が炭素数3~20のアルキルアミノアルキル基で置換されたアルキルアミノアルキル置換芳香族炭化水素基、などが挙げられる。
5-メチルチエニル基、5-ヘキシルチエニル基、5-デカチエニル基、5-ステアリルチエニル基など前記複素芳香族基が炭素数1~20のアルキル基で置換されたアルキル置換複素芳香族基、
5-(2-エトキシエチル)チエニル基、5-(2-n-テトラデシルオキシエチル)チエニル基、5-(2-シクロヘキシルオキシエチル)チエニル基、5-(12-エトキシドデシル)チエニル基など、前記芳香族炭化水素基が炭素数3~20のアルコキシアルキル基で置換されたアルコキシアルキル置換複素芳香族基、
5-(3-オクチルアミノプロピル)チエニル基、5-(3-ドデシルアミノプロピル)チエニル基、5-(ジエチルアミノエチル)チエニル基など、前記の複素芳香族基が炭素数3~20のアルキルアミノアルキル基で置換されたアルキルアミノアルキル置換複素芳香族基、などが挙げられる。
(I)上記の一般式(2)または一般式(3)で表される置換基、又は、
(II)炭素数2~20のアルキル基、炭素数2~20のアルケニル基、ハロゲン原子を有する炭素数2~20のアルキル基、炭素数3~20のアルコキシアルキル基、炭素数3~20のアルキルスルファニルアルキル基、炭素数3~20のアルキルアミノアルキル基、芳香族炭化水素基又は複素芳香族基、炭素数2~20のアルキル基または炭素数2~20のアルケニル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、ハロゲン原子を有する炭素数2~20のアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、炭素数3~20のアルコキシアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、炭素数3~20のアルキルスルファニルアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、炭素数3~20のアルキルアミノアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基から選ばれる基であり、(II)を例示すると、
炭素数2~20のアルキル基としては、エチル基、n-プロピル基、イソプロピル基、n-ブチル基、イソブチル基、n-ペンチル基、イソペンチル基、ネオペンチル基、n-ヘキシル基、1-メチルペンチル基、4-メチル-2-ペンチル基、3,3-ジメチルブチル基、2-エチルブチル基、n-ヘプチル基、1-メチルヘキシル基、シクロヘキシルメチル基、n-オクチル基、tert-オクチル基、1-メチルヘプチル基、2-エチルヘキシル基、2-プロピルペンチル基、n-ノニル基、2,2-ジメチルヘプチル基、2,6-ジメチル-4-ヘプチル基、3,5,5-トリメチルヘキシル基、n-デシル基、n-ウンデシル基、1-メチルデシル基、n-ドデシル基、n-トリデシル基、1-ヘキシルヘプチル基、n-テトラデシル基、n-ペンタデシル基、n-ヘキサデシル基、n-ヘプタデシル基、n-オクタデシル基、n-エイコシル基、シクロペンチル基、シクロヘキシル基、4-メチルシクロヘキシル基、シクロヘプチル基、シクロオクチル基などの直鎖、分岐または環状のアルキル基、
ハロゲン原子を有する炭素数2~20のアルキル基としては、2,2,3,3,3-ペンタフルオロプロピル基、2,2,3,3,4,4,4-ヘプタフルオロブチル基、2,2,3,3,4,4,5,5,5-ノナフルオロペンチル基、2,2,3,3,4,4,5,5,6,6,6-ウンデカフルオロヘキシル基、2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-ペンタデカフルオロオクチル基など、前記炭素数2~20のアルキル基の水素原子の一部をフッ素原子で置換されたアルキル基、
炭素数3~20のアルキルアミノアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基としては、N-メチルアミノプロピルフェニル基、N-ブチルアミノプロピルフェニル基、N-ドデシルアミノプロピルフェニル基、N-メチルアミノプロピル-2-チエニル基など、前記芳香族炭化水素基または複素芳香族基が炭素数3~20のアルキルアミノアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、などが挙げられる。
更に、高次の液晶相を呈し、移動度のバラツキを抑制する点で、上記(II)は好ましくは、炭素数2~20のアルキル基、炭素数3~20のアルコキシアルキル基、炭素数3~20のアルキルスルファニルアルキル基であり、特に好ましくは、炭素数4~18のアルキル基、炭素数4~18のアルコキシアルキル基、炭素数4~18のアルキルスルファニルアルキル基である。
きるが、これらに限られるものではない。
本発明化合物の合成は、公知慣用の方法を組み合わせて行うことができる。
合成経路の一例は、以下を挙げることができる。
ウォルフ・キッシュナー還元することによりアルキル化された化合物を得る。次に、アルキル置換部位の反対側を発煙硝酸でニトロ化、次いで錫粉末によりアミノ基に還元後、亜硝酸化合物によりジアゾ化し、更にザンドマイヤー反応によりヨウ素化する。最後にアセチレン誘導体との園頭カップリングにより、目的とする化合物を得ることができる。
本発明化合物が示す液晶相は、SmB,SmBcryst、SmI、SmF、SmE、SmJ、SmG、SmK、およびSmHからなる群から選ばれる液晶相であることが好ましい。この理由は、本発明に関わる液晶物質を液晶相で有機半導体として用いる場合、これらの液晶相は流動性が小さいためイオン伝導を誘起しにくく、また、分子配向秩序が高いため液晶相において高い移動度が期待できるからである。また、本発明に関わる液晶物物質を結晶相で有機半導体として用いる場合には、これらの液晶相は、N相、SmA相およびSmC相に比べて流動性が小さいため、温度の上昇により液晶相に転移した場合にも素子の破壊が起こりにくいためである。液晶相の発現が降温過程においてのみみられる場合は、一旦結晶化すると、結晶温度領域が広がるため、結晶相で応用する場合に好都合である。本発明化合物は、降温過程において、SmBcryst、SmE、SmF、SmI、SmJ、SmG、SmK、又はSmHの相を示すことを特徴とする。
これは、以下に述べるスクリーニング法(判定法)によって、容易に判定することが出来る。このスクリーニング法に用いる各測定法の詳細に関しては、必要に応じて、下記の文献を参照することができる。
文献A:偏光顕微鏡の使い方:実験化学講第4版1巻、丸善、P429~435
文献B:液晶材料の評価:実験化学講座第5版27巻P295~300、丸善
:液晶科学実験入門日本液晶学会編、シグマ出版
(S2)等方相に加熱したサンプルを毛細管現象を利用して、スライドガラスをスペーサーを介して張り合わせた15μm厚のセルに注入する。一旦、セルを等方相温度まで加熱し、偏光顕微鏡でそのテクスチャーを観察し、等方相より低い温度領域で暗視野とならないことを確認する。これは、分子長軸が基板に対して水平配向していることを示すもので、以後のテクスチャー観察に必要な要件となる。
(S3)適当な降温速度、例えば、5℃/分程度の速度でセルを冷却しながら、顕微鏡によるテクスチャーを観察する。その際、冷却速度が速すぎると、形成される組織が小さくなり、詳細な観察が難しくなるので、再度、等方相まで温度を上げて、冷却速度を調整して、組織が容易に観察しやすい、組織のサイズが50μm以上となる条件を設定する。
(S4)上記(S3)項で設定した条件で、等方相から室温(20℃)まで冷却しながらテクスチャーを観察する。この間にセル中で試料が結晶化すると、格子の収縮に伴い、亀裂や空隙が生じ、観察されるテクスチャーに黒い線、または、ある大きさを有する領域が現れる。サンプルを注入する際に空気がはいると同様の黒い領域(一般には丸い)が局所的に生じるが、結晶化によって生じた黒い線や領域は組織内や境界に分布して現われるので容易に区別できる。これらは、偏光子、及び、検光子を回転させても、消失や色の変化が見られないことから、テクスチャーに見られるこれ以外の組織とは容易に識別できる。このテクスチャーが現れる温度を結晶化温度として、その温度より高い温度領域で現れるテクスチャーがネマテック相、SmA相、SmC相でないことを確認する。サンプルがネマチック相を示す場合は、糸巻き状と表現される特徴的なシュリーレンテクスチャー(典型的なシュリーレンテクスチャー)が観察され、SmA相やSmC相を示す場合は、fan-likeテクスチャーと呼ばれる扇型でその領域内は均一組織を有する特徴的なテクスチャー(典型的なFan-likeテクスチャー)が観察されるので、その特徴的なテクスチャーから容易に判定することができる。
文献D:化学便覧 基礎編 改訂第5版II-608-610 14.1 b仕事関数 (丸善出版株式会社)(2004)
本発明における移動度は、ホールや電子などのキャリアの移動度であり、有機半導体材料の性能を表す指標となる。移動度には、TOF(Time-of-Flight)法による移動度(μTOF:単位cm2/V・s)、および有機トランジスタにより求められる移動度(μFET:単位cm2/V・s)があり、μTOFやμFETが高いほど、キャリアが流れ易いことになる。
移動度(μTOF)は、TOF測定用セルの電極間の電圧をV、電極間距離をd、光電流の波形から算出した膜厚中を横切る時間をTrとし、下記式(i)により求められる。また、移動度(μFET)は、ドレイン電圧VDを固定し、ゲート電圧VGを変化させることによって得られる伝達特性の曲線を用いて、下記式(ii)により求められる。
有機半導体をデバイスに応用する際の有用性はその物質の示す移動度が一つの目安となる。これは、移動度によってデバイスの特性が制限されるからである。従来、アモルファス有機半導体においては移動度は高いものでも10-2cm2/Vs程度であり、一般には10-5~10-3cm2/Vsの値である。したがって、液晶相が示す10-2cm2/Vsを超える高い移動度、特に、高次のスメクチック相が示す0.1cm2/Vsを超える移動度はアモルファス有機半導体材料では実現が難しく、液晶材料の優位性が明白である。
相の利用が有効である。
実施例に示すように、FETを作製し、その特性を評価することにより本発明の有機半導体材料が、有機トランジスタとして使用可能であることを確認可能である。
このような方法による半導体デバイス動作確認の詳細に関しては、例えば文献 S. F.Nelsona,Y.-Y.Lin,D.J.Gundlach,and T. N.Jackson、Temperature-independent transport in high-mobility pentacene transistors,Appl.Phys.Lett.,72,No.15 1854-1856(1998)を参照することができる。
本発明の有機半導体材料は、蒸着して半導体膜を形成しても構わないが、低温成膜が可能で、生産性に優れる印刷用インキとして使用するのが好ましい。インキを調製するためには、本発明の有機半導体材料を溶媒に溶解し、半導体性能を損なわない範囲で、インキ特性を付与するために、フッ素系やシリコン系などのレベリング剤、およびポリスチレンやアクリル樹脂などの高分子化合物を粘度調整剤として添加することもできる。
使用する有機溶媒は何を用いても構わず、また2種以上の有機溶媒を混合して用いても良い。具体的には、n-ヘキサン、n-オクタン、n-デカン、n-ドデカンなどの脂肪族系溶媒;シクロヘキサンなどの脂環式系溶媒;ベンゼン、トルエン、クメン、o-キシレン、m-キシレン、p-キシレン、p-シメン、メシチレン、アニソール、2-メチルアニソール、3-メチルアニソール、4-メチルアニソール、2,5-ジメチルアニソール、3,5-ジメトキシトルエン、2,4-ジメチルアニソール、フェネトール、安息香酸メチル、安息香酸エチル、安息香酸プロピル、安息香酸ブチル、1,5-ジメチルテトラリン、n-プロピルベンゼン、n-ブチルベンゼン、n-ペンチルベンゼン、1,3,5-トリエチルベンゼン、1,3-ジメトキシベンゼン、クロロベンゼン、o-ジクロロベンゼン、トリクロロベンゼン等の芳香族系溶媒;テトラヒドロフラン、ジオキサン、エチレングリコールジエチルエーテル、アニソール、ベンジルエチルエーテル、エチルフェニルエーテル、ジフェニルエーテル、メチル-t-ブチルエーテル等のエーテル系溶媒;酢酸メチル、酢酸エチル、エチルセロソルブ、プロピレングリコールメチルエーテルアセテート等のエステル系溶媒;メタノール、エタノール、イソプロパノール等のアルコール系溶媒;アセトン、メチルエチルケトン、シクロヘキサノン、2-ヘキサノン、2-ヘプタノン、3-ヘプタノン等のケトン系溶媒;その他ジメチルホルムアミド、ジメチルスルホキシド、ジエチルホルムアミドなどが挙げられるが、これらに限定されることはない。
調製された液体組成物における本発明の有機半導体材料の濃度としては、0.01~20重量%であることが好ましく、さらには0.1~10重量%であることが好ましい。
使用する有機溶媒は1種類でもよいが、所望の均質性の高い薄膜を得るため、複数の種類の溶媒を混合して用いてもよい。
次に本発明の有機半導体材料を含有する有機トランジスタについて説明する。
有機トランジスタは、通常、ソース電極、ドレイン電極およびゲート電極、およびゲート絶縁層、有機半導体層を有して成るものであり、各電極や各層の配置によって種々のタイプのトランジスタがあるが、本発明の有機半導体材料はトランジスタの種類に限定されることなく、何れのトランジスタにも使用することができる。トランジスタの種類については、アルドリッチ社の材料科学の基礎第6号「有機トランジスタの基礎」などを参照することができる。
図1に示すボトムコンタクト型を一例に詳説すると、1は基板、2はゲート電極、3はゲート絶縁層、4は有機半導体、5はソース電極、6はドレイン電極である。
有機半導体層は、真空蒸着法等の公知慣用の製造方法で製造することができるが、組成物を有機半導体材料用インクとし、印刷法で簡便に有機半導体層を形成できる。
本発明の有機トランジスタは、ディスプレイを構成する画素のスイッチング用トランジスタ、信号ドライバー回路素子、メモリ回路素子、信号処理回路素子等として好適に使用できる。ディスプレイの例としては、液晶ディスプレイ、分散型液晶ディスプレイ、電気泳動型ディスプレイ、粒子回転型表示素子、エレクトロクロミックディスプレイ、有機エレクトロルミネッセンスディスプレイ、電子ペーパー等が挙げられる。
適用可能な有機半導体デバイスとしては、ダイオード、有機トランジスタ、メモリ、フォトダイオード、発光ダイオード、発光トランジスタや、ガスセンサー、バイオセンサー、血液センサー、免疫センサー、人工網膜、味覚センサーなどのセンサー類、RFID等が挙げられる。
<液晶相の観察>
先ず、イオン交換水、アセトンの順で超音波洗浄し、乾燥したスライドグラス上に、有機半導体材料を置き、その上に同様に洗浄したカバーガラスをセットして、測定用試験片とした。
ホットステージ(メトラートレード製FP82HT)を備えたニコン製エクリプスE600POL(接眼レンズ10倍、および対物レンズ20倍)に上記の試験片をセットし、5℃/分の昇温速度で融点に到達するまで加熱した。有機半導体材料が融解したことを確認し、ピンセットでカバーガラスを押さえて有機半導体材料を薄膜状に伸ばした。
次に、この試験片を5℃/分で冷却しながら、冷却過程の相変化を偏光顕微鏡で観察した。結晶相のテクスチャーを(a)、高次の液晶相のテクスチャーを(b)として図に示した。
熱酸化膜付シリコンウエハー(ヘビードープp型シリコン(P+-Si)、熱酸化膜(SiO2)厚さ:300nm)を20×25mmに切断後、この切断したシリコンウエハー(こののち基板と略す)を中性洗剤、超純水、イソプロピルアルコール(IPA)、アセトン、IPAの順に超音波洗浄を行った。
次に、液晶性有機半導体化合物をキシレンに溶解させ、溶液を調整した。溶液の濃度は1wt%から0.5wt%とした。この溶液、および、溶液を基板に塗布するガラス製のピペットを予め、ホットステージ上で所定の温度に加熱しておき、上記の基板をオーブン内に設置したスピンコータ上に設置し、オーブン内を60℃に昇温した後、溶液を基板上に塗布し、基板を回転(約3000rpm、30秒)させた。回転停止後、基板を素早く取り出し室温まで冷却させた。
更に、有機半導体層を塗布した基板に、真空蒸着法(2×10-6Torr)を用いて、金をメタルマスクを介してパターン蒸着することにより、ソース・ドレイン電極を形成した(チャネル長:チャネル幅=75μm:3000μm)。
作製した有機トランジスタの評価は、通常の大気雰囲気下において、2電源のソース・メジャーメントユニットを用いて、ソース電極、ドレイン電極間に流れる電流を、ゲート電極(P+-Si)に電圧をスイープ印加(Vsg:+40~-60V)しながら測定(伝達特性)することによりおこなった(ソース電極、ドレイン電極間電圧Vsd:-80V)。移動度は、該伝達特性における、√Id-Vgの傾きから、飽和特性の式を用いた周知の方法により算出した。なお、移動度の測定は5つのトランジスタについて行い、その平均値を算出した。また、誤差は、測定値の標準偏差を求め、誤差(%)=(標準偏差/平均値)×100から算出した。
Liquid Crystals 31, 137-1380 (2004)に記載の方法で得た2-デシル-BTBT 4.96g(13mmol)を320mLのジクロロメタンに溶解後-50℃に冷却し、発煙硝酸の1.2Mジクロロメタン溶液24mLを30分かけて滴下した。-50℃で更に2時間撹拌した後、26mLの飽和炭酸水素ナトリウム水溶液を加え反応を停止した。分液して下層を取り、10%食塩水で洗浄、無水硫酸マグネシウムで乾燥し濃縮乾固して粗製固体を得た。この固体を2‐ブタノンから再結晶し、2-デシル-7-ニトロBTBTの黄色結晶、3.72g(収率、67%)を得た。
この固体をクロロホルム約100mLに分散し、濃アンモニア水、飽和食塩水の順で洗浄し、無水硫酸マグネシウムで乾燥後、濃縮乾固し粗製固体を得た。この固体をシリカゲルカラム(クロロホルム/シクロヘキサン=1/1、1%トリエチルアミンを添加)で分離精製し、石油ベンジンから再結晶して微灰色の2-アミノ-7-デシルBTBT 1.72g(収率、72%)を得た。
1HNMR(300MHz,CDCl3):δ 8.12(d,1H,J=1.8Hz,H-6),7.92(d,1H,J=8.2Hz,H-9),7.79(d,1H,J=7.8Hz,H-4),7.73(s,1H,H-1),7.69-7.53(m,9H,H-8,H-2’,-3’,-5’,-6’of Ph,H-2’,-3’,-5’,-6’of Ph),7.29(dd,1H,J=7.8Hz,H-3),7.38(tt,1H,J=7.8Hz,H-4’of Ph),2.77(t,2H,J=7Hz,BTBT-CH2),1.70(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,14H,CH2 x7),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=556.3
実施例1で得られた2-デシル-7-ヨードBTBT(253mg、0.5mmol)にヨウ化銅(0.11g、0.6mmol)、ビス(トリフェニルホスフィン)パラジウム(II)ジクロリド(0.08g、0.1mmol)、トリエチルアミン36mLを加え、室温で窒素ガスを15分間バブリングした。窒素雰囲気下でエチニルベンゼン0.55g(5.4mmol)を加え、35℃に昇温後、30分間加熱撹拌した。その後、85℃まで昇温後、40時間加熱撹拌した。室温まで冷却した後、反応液を水250mLに加えた。生成した固形物をろ集してアセトン100mLで洗浄した。得られた固形物を50℃に加熱したシクロヘキサン500mLに溶解後、この溶液にシリカゲル2gおよび金属スカベンジャー2gを加えてスラリーを調製した。スラリーを50℃で1時間撹拌後、シリカゲルおよび金属スカベンジャーをろ別除去し、ろ液から再結晶することで、(化16)で表されるBTBT誘導体bの白色結晶178mg(収率74%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.61-7.55(m,3H,H-8,H-2’,-6’of Ph),7.38-7.35(m,3H,H-3’,-4’,-5’of Ph),7.29(dd,1H,J=7.8Hz,H-3),2.77(t,2H,J=7Hz,BTBT-CH2),1.70(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,14H,CH2 x7),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=480.3
実施例2において、エチニルベンゼン0.55g(5.4mmol)を2-エチニルナフタレン0.82g(5.4mmol)に代えた以外は実施例2と同様の操作を行い、(化17)で表されるBTBT誘導体cの白色結晶197mg(収率74%)を得た。
1HNMR(300MHz,CDCl3):δ 8.48(d,1H,H of NaPh),8.18(d,1H,J=1.8Hz,H-6),7.88-7.76(m,5H,H-9,H-4,3H of NaPh),7.72(m,3H,H-1,H-8,3H of NaPh),7.29(dd,1H,J=7.8Hz,H-3),2.77(t,2H,J=7Hz,BTBT-CH2),1.70(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,14H,CH2 x7),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=530.2
実施例2において、エチニルベンゼン0.55g(5.4mmol)を1-エチニル-4-フェニルベンゼン0.93g(5.4mmol)に代えた以外は実施例2と同様の操作を行い、(化18)で表されるBTBT誘導体dの白色結晶189mg(収率71%)を得た。
1HNMR(300MHz,CDCl3):δ 8.10(d,1H,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.65-7.59(m,7H,H-8,6H of BiPh),7.45(t,2H of BiPh),7.36(t,1H of BiPh),7.29(dd,1H,J=7.8Hz,H-3),2.77(t,2H,J=7Hz,BTBT-CH2),1.70(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,14H,CH2 x7),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=556.2
実施例2において、エチニルベンゼン0.55g(5.4mmol)を3-エチニルチオフェン0.58g(5.4mmol)に代えた以外は実施例2と同様の操作を行い、(化19)で表されるBTBT誘導体eの白色結晶147mg(収率60%)を得た。
1HNMR(300MHz,CDCl3):
δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.56(dd,1H,H-8),7.54(d,1H of Th),
7.32-7.20(m,3H,H-3,2H of Th),2.77(t,2H,J=7Hz,BTBT-CH2),1.70(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,14H,CH2 x7),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=486.2
実施例2において、エチニルベンゼン0.55g(5.4mmol)を1-エチニル-4-フェノキシベンゼン1.05g(5.4mmol)に代えた以外は実施例2と同様の操作を行い、(化20)で表されるBTBT誘導体fの白色結晶62mg(収率22%)を得た。
1HNMR(300MHz,CDCl3):
δ 8.07(d,1H,J=1.8Hz,H-6),7.80(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.54(dd,1H,J=8.2Hz,H-8),7.51(d,2H of Ph),7.36(m,2H of Ph),7.29(dd,1H,J=7.8Hz,H-3),7.15(tt,1H of Ph),7.06(dd,2H of Ph),6.98(dd,2H of Ph),2.77(t,2H,J=7Hz,BTBT-CH2),2.37(s,3H,Ph-CH3),1.70(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,14H,CH2 x7),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=572.2
実施例2において、エチニルベンゼン0.55g(5.4mmol)を4-エチニルトルエン0.63g(5.4mmol)に代えた以外は実施例2と同様の操作を行い、(化21)で表されるBTBT誘導体gの白色結晶94mg(収率38%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.57(dd,1H,J=8.2Hz,H-8),7.44(d,2H,H-2’,-6’of Ph),7.29(dd,1H,J=7.8Hz,H-3),7.16(d,2H,H-3’,-5’of Ph),2.77(t,2H,J=7Hz,BTBT-CH2),2.37(s,3H,Ph-CH3),1.70(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,14H,CH2 x7),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=494.3
実施例2において、エチニルベンゼン0.55g(5.4mmol)を1-エチニル-4-プロピルベンゼン0.78g(5.4mmol)に代えた以外は実施例2と同様の操作を行い、(化22)で表されるBTBT誘導体hの白色結晶102mg(収率39%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.57(dd,1H,J=8.2Hz,H-8),7.44(d,2H,H-2’,-6’of Ph),7.29(dd,1H,J=7.8Hz,H-3),7.16(d,2H,H-3’,-5’of Ph),2.77(t,2H,J=7Hz,BTBT-CH2),2.63(t,2H,Ph-CH2),1.63(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,16H,CH2 x8),0.96(t,3H,J=7Hz,CH3),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=522.2
実施例2において、エチニルベンゼン0.55g(5.4mmol)を1-エチニル-4-t-ブチルベンゼンg(5.4mmol)に代えた以外は実施例2と同様の操作を行い、(化23)で表されるBTBT誘導体iの白色結晶113mg(収率40%)を得た。
1HNMR(300MHz,CDCl3):
δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.57(dd,1H,J=8.2Hz,H-8),7.50(d,2H,H-2’,-6’of Ph),7.39(d,2H,H-3’,-5’of Ph),7.29(dd,1H,J=7.8Hz,H-3),2.77(t,2H,J=7Hz,BTBT-CH2),1.63(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,23H,CH2 x7,CH3 x3),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=536.26
実施例2において、エチニルベンゼン0.55g(5.4mmol)を1-エチニル-4-ペンチルベンゼン0.93g(5.4mmol)に代えた以外は実施例2と同様の操作を行い、(化24)で表されるBTBT誘導体jの白色結晶93mg(収率34%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.57(dd,1H,J=8.2Hz,H-8),7.44(d,2H,H-2’,-6’of Ph),7.29(dd,1H,J=7.8Hz,H-3),7.16(d,2H,H-3’,-5’of Ph),2.77(t,2H,J=7Hz,BTBT-CH2),2.63(t,2H,Ph-CH2),1.70(quint.2H,J=7Hz,Ph-CH2CH2),1.63(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,18H,CH2 x9),0.88(t,6H,J=7Hz,CH3x2).
FD-MS:[M]+=550.3
実施例2において、エチニルベンゼン0.55g(5.4mmol)を1-エチニル-4-ヘキシルベンゼン1.0g(5.4mmol)に代えた以外は実施例2と同様の操作を行い、(化25)で表されるBTBT誘導体kの白色結晶107mg(収率38%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.57(dd,1H,J=8.2Hz,H-8),7.44(d,2H,H-2’,-6’of Ph),7.29(dd,1H,J=7.8Hz,H-3),7.16(d,2H,H-3’,-5’of Ph),2.77(t,2H,J=7Hz,BTBT-CH2),2.63(t,2H,Ph-CH2),1.70(quint.2H,J=7Hz,Ph-CH2CH2),1.63(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,20H,CH2 x10),0.88(t,6H,J=7Hz,CH3x2).
実施例2において、エチニルベンゼン0.55g(5.4mmol)を3-エチニル-ピリジン0.56g(5.4mmol)に代えた以外は実施例2と同様の操作を行い、(化26)で表されるBTBT誘導体lの白色結晶44mg(収率18%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.57(dd,1H,J=8.2Hz,H-8),7.44(d,2H,H-2’,-6’of Ph),7.29(dd,1H,J=7.8Hz,H-3),7.16(d,2H,H-3’,-5’of Ph),2.77(t,2H,J=7Hz,BTBT-CH2),2.63(t,2H,Ph-CH2),1.70(quint.2H,J=7Hz,Ph-CH2CH2),1.63(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,20H,CH2 x10),0.88(t,6H,J=7Hz,CH3x2).
まず、BTBT(6g、25mmol)をジクロロメタン300mLに加え、窒素ガス雰囲気下で-10℃になるまで攪拌した。次に塩化アルミニウム(13.3g、0.1mol)を加え、-70℃まで降温した。-70℃到達後、テトラデカン酸クロライド(6.9g、25mmol)を20分かけて滴下し、3.5時間撹拌した。反応液を水600gに添加した後、ジクロロメタン200g加え、分液ロートへ移送した。下層を水300gで2回分液洗浄した後、有機層を濃縮した。析出物をトルエン300gに加熱溶解後、室温で再結晶して、2-(テトラデシル-1-オン)-BTBTの黄色結晶、9.7g得た(収率86%)。
次いで、2-(テトラデシル-1-オン)-BTBT(9.0g、20mmol)、85.5%水酸化カリウム(3.5g、53 mmol)、ヒドラジン一水和物(6.5 g、124mmol)をジエチレングリコール300mLに加え、窒素雰囲気下で攪拌し、100℃まで昇温し、1時間撹拌した。その後、170℃まで昇温させ、デカンターを用いて反応系から水分を除去し、4時間加熱撹拌した。室温まで冷却後、反応溶液中に析出した固形物をろ過して回収し、水、エタノールの順に洗浄した。洗浄後の固形物を70℃で真空乾燥して、2-テトラデシル-BTBT8.5g得た(収率97%)。
最後に、2-テトラデシル-7-ブロモBTBT(258mg、0.5mmol)にヨウ化銅(0.11g、0.6mmol)、ビス(トリフェニルホスフィン)パラジウム(II)ジクロリド(0.08g、0.1mmol)、トリエチルアミン36mLを加え、室温で窒素ガスを15分間バブリングした。窒素雰囲気下でエチニルベンゼン0.55g(5.4mmol)を加え、35℃に昇温後、30分間加熱撹拌した。その後、85℃まで昇温後、40時間加熱撹拌した。室温まで冷却した後、反応液を水250mLに加えた。生成した固形物をろ集してアセトン100mLで洗浄した。得られた固形物を50℃に加熱したシクロヘキサン500mLに溶解後、この溶液にシリカゲル2gおよび金属スカベンジャー2gを加えてスラリーを調製した。スラリーを50℃で1時間撹拌後、シリカゲルおよび金属スカベンジャーをろ別除去し、ろ液から再結晶することで、(化27)で表されるBTBT誘導体mの白色結晶180mg(収率67%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.61-7.55(m,3H,H-8,H-2’,-6’of Ph),7.38-7.35(m,3H,H-3’,-4’,-5’of Ph),7.29(dd,1H,J=7.8Hz,H-3),2.77(t,2H,J=7Hz,BTBT-CH2),1.70(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,22H,CH2 x11),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=536.3
実施例13において、エチニルベンゼン0.55g(5.4mmol)に代えて、4-エチニルトルエン0.63g(5.4mmol)を使用した以外は、実施例13と同様の操作を行い、(化28)で表されるBTBT誘導体nの白色結晶124mg(収率45%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,
H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.57(dd,1H,J=8.2Hz,H-8),7.44(d,2H,H-2’,-6’of Ph),7.29(dd,1H,J=7.8Hz,H-3),7.16(d,2H,H-3’,-5’of Ph),2.77(t,2H,J=7Hz,BTBT-CH2),2.37(s,3H,Ph-CH3),1.70(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,22H,CH2 x11),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=550.3
実施例13において、エチニルベンゼン0.55g(5.4mmol)に代えて、1-エチニル-4-ペンチルベンゼン0.93g(5.4mmol)を使用した以外は、実施例13と同様の操作を行い、(化29)で表されるBTBT誘導体oの白色結晶162mg(収率53%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.57(dd,1H,J=8.2Hz,H-8),7.44(d,2H,H-2’,-6’of Ph),7.29(dd,1H,J=7.8Hz,H-3),7.16(d,2H,H-3’,-5’of Ph),2.77(t,2H,J=7Hz,BTBT-CH2),2.63(t,2H,Ph-CH2),1.70(quint.2H,J=7Hz,Ph-CH2CH2),1.63(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,26H,CH2 x13)0.88(t,6H,J=7Hz,CH3x2).
FD-MS:[M]+=606.3
まず、BTBT(6g、25mmol)をジクロロメタン300mLに加え、窒素ガス雰囲気下で-10℃になるまで攪拌した。次に塩化アルミニウム(13.3g、0.1mol)を加え、-70℃まで降温した。-70℃到達後、オクタン酸クロライド(3.8g、25mmol)を20分かけて滴下し、3.5時間撹拌した。反応液を水600gに添加した後、ジクロロメタン200g加え、分液ロートへ移送した。下層を水300gで2回分液洗浄した後、有機層を濃縮した。析出物をトルエン250gに加熱溶解後、室温で再結晶して、2-(オクチル-1-オン)-BTBTの黄色結晶、7.9g得た(収率84%)。
次いで、2-(オクチル-1-オン)-BTBT(7.3g、20mmol)、85.5%水酸化カリウム(3.5g、53 mmol)、ヒドラジン一水和物(6.5 g、124mmol)をジエチレングリコール300mLに加え、窒素雰囲気下で攪拌し、100℃まで昇温し、1時間撹拌した。その後、170℃まで昇温させ、デカンターを用いて反応系から水分を除去し、4時間加熱撹拌した。室温まで冷却後、反応溶液中に析出した固形物をろ過して回収し、水、エタノールの順に洗浄した。洗浄後の固形物を70℃で真空乾燥して、2-オクチル-BTBT6.6g得た(収率94%)。
更に、2-オクチル-BTBT(6.5g、18.5mmol)をクロロホルム200mLに溶解後0℃に冷却し、臭素3.7g(23.1mmol)を20分かけて滴下した。0℃で更に0.5時間撹拌した後、室温まで昇温し、3時間攪拌し反応を停止した。水加えを分液して下層を取り、濃縮乾固して粗製固体を得た。この固体をアセトンから再結晶して2-オクチル-7-ブロモBTBTの白色結晶、4.39g(収率、55%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.57(dd,1H,J=8.2Hz,H-8),7.44(d,2H,H-2’,-6’of Ph),7.29(dd,1H,J=7.8Hz,H-3),7.16(d,2H,H-3’,-5’of Ph),2.77(t,2H,J=7Hz,BTBT-CH2),2.63(t,2H,Ph-CH2),1.70(quint.2H,J=7Hz,Ph-CH2CH2),1.63(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,14H,CH2 x7)0.88(t,6H,J=7Hz,CH3x2).
FD-MS:[M]+=522.2
まず、BTBT(6g、25mmol)をジクロロメタン300mLに加え、窒素ガス雰囲気下で-10℃になるまで攪拌した。次に塩化アルミニウム(13.3g、0.1mol)を加え、-70℃まで降温した。-70℃到達後、ヘキサン酸クロライド(3.37g、25mmol)を20分かけて滴下し、3.5時間撹拌した。反応液を水600gに添加した後、ジクロロメタン200g加え、分液ロートへ移送した。下層を水300gで2回分液洗浄した後、有機層を濃縮した。析出物をトルエン250gに加熱溶解後、室温で再結晶して、2-(ヘキシル-1-オン)-BTBTの黄色結晶、7.4g得た(収率88%)。
次いで、2-(ヘキシル-1-オン)-BTBT(6.8g、20mmol)、85.5%水酸化カリウム(3.5g、53 mmol)、ヒドラジン一水和物(6.5 g、124mmol)をジエチレングリコール300mLに加え、窒素雰囲気下で攪拌し、100℃まで昇温し、1時間撹拌した。その後、170℃まで昇温させ、デカンターを用いて反応系から水分を除去し、4時間加熱撹拌した。室温まで冷却後、反応溶液中に析出した固形物をろ過して回収し、水、エタノールの順に洗浄した。洗浄後の固形物を70℃で真空乾燥して、2-ヘキシル-BTBT6.0g得た(収率92%)。
更に、2-ヘキシル-BTBT(6.0g、18.5mmol)をクロロホルム200mLに溶解後0℃に冷却し、臭素3.7g(23.1mmol)を20分かけて滴下した。0℃で更に0.5時間撹拌した後、室温まで昇温し、3時間攪拌し反応を停止した。水加えを分液して下層を取り、濃縮乾固して粗製固体を得た。この固体をアセトンから再結晶して2-ヘキシル-7-ブロモBTBTの白色結晶、4.3g(収率、58%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.61-7.55(m,3H,H-8,H-2’,-6’of Ph),7.38-7.35(m,3H,H-3’,-4’,-5’of Ph),7.29(dd,1H,J=7.8Hz,H-3),2.77(t,2H,J=7Hz,BTBT-CH2),1.70(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,6H,CH2 x3),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=424.1
実施例17において、エチニルベンゼン0.55g(5.4mmol)に代えて、4-エチニルトルエン0.63g(5.4mmol)を使用した以外は、実施例17と同様の操作を行い、(化32)で表されるBTBT誘導体rの白色結晶107mg(収率49%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.57(dd,1H,J=8.2Hz,H-8),7.44(d,2H,H-2’,-6’of Ph),7.29(dd,1H,J=7.8Hz,H-3),7.16(d,2H,H-3’,-5’of Ph),2.77(t,2H,J=7Hz,BTBT-CH2),2.37(s,3H,Ph-CH3),1.70(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,6H,CH2 x3,0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=438.2
実施例17において、エチニルベンゼン0.55g(5.4mmol)に代えて、1-エチニル-4-ペンチルベンゼン0.93g(5.4mmol)を使用した以外は、実施例17と同様の操作を行い、(化33)で表されるBTBT誘導体sの白色結晶114mg(収率46%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.57(dd,1H,J=8.2Hz,H-8),7.44(d,2H,H-2’,-6’of Ph),7.29(dd,1H,J=7.8Hz,H-3),7.16(d,2H,H-3’,-5’of Ph),2.77(t,2H,J=7Hz,BTBT-CH2),2.63(t,2H,Ph-CH2),1.70(quint.2H,J=7Hz,Ph-CH2CH2),1.63(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,10H,CH2 x5)0.88(t,6H,J=7Hz,CH3x2).
FD-MS:[M]+=494.2
実施例17において、エチニルベンゼン0.55g(5.4mmol)に代えて、3-エチニルチオフェン0.58g(5.4mmol)を使用した以外は、実施例17と同様の操作を行い、(化34)で表されるBTBT誘導体tの白色結晶166mg(収率77%)を得た。
1HNMR(300MHz,CDCl3):δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.56(dd,1H,H-8),7.54(d,1H of Th),7.32-7.20(m,3H,H-3,2H of Th),2.77(t,2H,J=7Hz,BTBT-CH2),1.70(quint.2H,J=7Hz,BTBT-CH2CH2),1.55-1.27(m,6H,CH2 x3),0.88(t,3H,J=7Hz,CH3).
FD-MS:[M]+=430.1
まず、BTBT(6g、25mmol)をジクロロメタン300mLに加え、窒素ガス雰囲気下で-10℃になるまで攪拌した。次に塩化アルミニウム(13.3g、0.1mol)を加え、-70℃まで降温した。-70℃到達後、10-ブロモデカン酸クロライド(6.73g、25mmol)を20分かけて滴下し、3.5時間撹拌した。反応液を水600gに添加した後、ジクロロメタン200g加え、分液ロートへ移送した。下層を水300gで2回分液洗浄した後、有機層を濃縮した。析出物をトルエン250gに加熱溶解後、室温で再結晶して、2-(10-ブロモデシル-1-オン)-BTBTの黄色結晶、9.0g得た(収率76%)。
次いで、2-(10-ブロモデシル-1-オン)-BTBT(8.5g、18mmol)、85.5%水酸化カリウム(3.2g、48 mmol)、ヒドラジン一水和物(5.85g、112mmol)をジエチレングリコール300mLに加え、窒素雰囲気下で攪拌し、100℃まで昇温し、1時間撹拌した。その後、170℃まで昇温させ、デカンターを用いて反応系から水分を除去し、4時間加熱撹拌した。室温まで冷却後、反応溶液中に析出した固形物をろ過して回収し、水、エタノールの順に洗浄した。洗浄後の固形物を70℃で真空乾燥して、2-(10-ブロモデシル)-BTBT7.0g得た(収率85%)。
更に、2-(10-ブロモデシル)-BTBT(6.9g、15mmol)をクロロホルム200mLに溶解後0℃に冷却し、臭素3.0g(18.7mmol)を20分かけて滴下した。0℃で更に0.5時間撹拌した後、室温まで昇温し、3時間攪拌し反応を停止した。水加えを分液して下層を取り、濃縮乾固して粗製固体を得た。この固体をアセトンから再結晶して2-(10-ブロモデシル)-7-ブロモBTBTの白色結晶、3.63g(収率、48%)を得た。
1HNMR(300MHz,CDCl3):
δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.61-7.55(m,3H,H-8,H-2’,-6’of Ph),7.38-7.35(m,3H,H-3’,-4’,-5’of Ph),7.29(dd,1H,J=7.8Hz,H-3),2.77(t,2H,J=7Hz,BTBT-CH2),2.49-2.56(4H,-CH2-S-CH2-),1.70(q,2H,BTBT-CH2CH2),1.30-1.60(m,14H,-CH2-),1.25(t,3H,CH3).
FD-MS:[M]+=540.2
実施例21において得られた2-(10-ブロモデシル)-7-フェニルエチニルBTBT(447mg、0.8mmol)、アミルアルコール10mL、脱水THF20mL、脱水DMF12mLを窒素雰囲気下、室温で撹拌しながら、モレキュラーシーブス4A(0.5g)及び水酸化セシウム・1水和物(274mg、1.6mmol)を加え、更に24時間撹拌した。反応液にクロロホルム100mLを加えてろ過し、ろ液を水、飽和食塩水の順に洗浄し、有機層を濃縮した。残渣をシリカゲルクロマトグラフィー(シクロヘキサン/クロロホルム=3/1)で精製し、(化36)で表されるBTBT誘導体vの白色結晶56mg(収率12%)を得た。
1HNMR(300MHz,CDCl3):
δ 8.08(d,1H,J=1.8Hz,H-6),7.83(d,1H,J=8.2Hz,H-9),7.78(d,1H,J=7.8Hz,H-4),7.72(s,1H,H-1),7.61-7.55(m,3H,H-8,H-2’,-6’of Ph),7.38-7.35(m,3H,H-3’,-4’,-5’of Ph),7.29(dd,1H,J=7.8Hz,H-3),3.37(t,4H,-CH2-O-CH2-),2.77(t,2H,J=7Hz,BTBT-CH2),1.70(q,2H,BTBT-CH2CH2),1.30-1.60(m,20H,-CH2-),0.90(t,3H,CH3).
FD-MS:[M]+=566.3
実施例1~22で得られたBTBT誘導体a~vについて、前記記載の方法でトランジスタ評価を行った結果を表1に、液晶相を観察した結果を図2~23に示した。
WO2006/077888記載の方法にて(化37)で表される化合物を合成した。得られた化合物について、実施例同様に液晶相の観察を行ったところ、液晶相は観察できなかった。また、実施例同様に作製したトランジスタの評価結果を表1に記載した。
特開2012-1442号公報記載の方法にて(化38)で表される化合物を合成した。得られた化合物について、実施例同様に液晶相の観察を行ったところ、高次の液晶相は観察できなかった。また、実施例同様に作製したトランジスタの評価結果を表1に記載した。
2. ゲート電極
3. ゲート絶縁膜
4. 有機半導体
5. ソース電極
6. ドレイン電極
Claims (7)
- 一般式(1)
(式中、R1-及びR2-が、下記(I)又は(II)の何れかであるが、少なくとも一方が(I)である。
(I)一般式(2)又は(3)である基
(Ar1は置換基を有してもよい芳香族炭化水素基又は複素芳香族基、Ar2は置換基を有してもよい芳香族炭化水素基又は置換基を有してもよい複素芳香族基、R’は水素原子、炭素数1~4のアルキル基を有するトリアルキルシリル基、炭素数1~20のアルキル基、置換基を有してもよい芳香族炭化水素基又は複素芳香族基。)
(II)炭素数2~20のアルキル基、炭素数2~20のアルケニル基、ハロゲン原子を有する炭素数2~20のアルキル基、炭素数3~20のアルコキシアルキル基、炭素数3~20のアルキルスルファニルアルキル基、炭素数3~20のアルキルアミノアルキル基、芳香族炭化水素基又は複素芳香族基、及び、
炭素数1~20のアルキル基、炭素数2~20のアルケニル基、ハロゲン原子を有する炭素数1~20のアルキル基、炭素数3~20のアルコキシアルキル基、炭素数3~20のアルキルスルファニルアルキル基、又は炭素数3~20のアルキルアミノアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、
から選ばれる基)
で表されるベンゾチエノベンゾチオフェン誘導体。 - 下記一般式(4)
(式中、R1-が下記一般式(2)又は(3)のいずれかの基であり、
(但し、Ar1、Ar2、およびR’は上記と同義を表し、
R2-は、炭素数2~20のアルキル基、炭素数2~20のアルケニル基、ハロゲン原子を有する炭素数2~20のアルキル基、炭素数3~20のアルコキシアルキル基、炭素数3~20のアルキルスルファニルアルキル基、炭素数3~20のアルキルアミノアルキル基、芳香族炭化水素基又は複素芳香族基、及び、
炭素数1~20のアルキル基、炭素数2~20のアルケニル基、ハロゲン原子を有する炭素数1~20のアルキル基、炭素数3~20のアルコキシアルキル基、炭素数3~20のアルキルスルファニルアルキル基、又は炭素数3~20のアルキルアミノアルキル基を置換基として持つ芳香族炭化水素基又は複素芳香族基、
から選ばれる基)
で表される請求項1に記載のベンゾチエノベンゾチオフェン誘導体。 - 請求項1又は2に記載のベンゾチエノベンゾチオフェン誘導体を用いた有機半導体材料。
- 請求項3に記載の有機半導体材料を含有する有機半導体インキ。
- 請求項3に記載の有機半導体材料を含有する有機半導体膜。
- 請求項3に記載の有機半導体材料を用いてなる有機半導体デバイス。
- 請求項3に記載の有機半導体材料を有機半導体層として用いる有機トランジスタ。
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| EP13834556.6A EP2894685B1 (en) | 2012-09-10 | 2013-09-10 | Benzothienobenzothiophene derivative, organic semiconductor material, and organic transistor |
| JP2014507272A JP5615459B2 (ja) | 2012-09-10 | 2013-09-10 | ベンゾチエノベンゾチオフェン誘導体、有機半導体材料、及び有機トランジスタ |
| CN201380057558.7A CN104769735B (zh) | 2012-09-10 | 2013-09-10 | 苯并噻吩并苯并噻吩衍生物、有机半导体材料、及有机晶体管 |
| KR1020157006113A KR101741568B1 (ko) | 2012-09-10 | 2013-09-10 | 벤조티에노벤조티오펜 유도체, 유기 반도체 재료, 및 유기 트랜지스터 |
| US14/426,862 US9490433B2 (en) | 2012-09-10 | 2013-09-10 | Benzothienobenzothiophene derivative, organic semiconductor material, and organic transistor |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2894685A1 (en) | 2015-07-15 |
| TWI535726B (zh) | 2016-06-01 |
| EP2894685A4 (en) | 2016-05-25 |
| US20150228913A1 (en) | 2015-08-13 |
| US9490433B2 (en) | 2016-11-08 |
| CN104769735B (zh) | 2017-07-28 |
| KR20150042253A (ko) | 2015-04-20 |
| EP2894685B1 (en) | 2018-10-31 |
| JP5615459B2 (ja) | 2014-10-29 |
| JPWO2014038708A1 (ja) | 2016-08-12 |
| KR101741568B1 (ko) | 2017-05-30 |
| TW201418261A (zh) | 2014-05-16 |
| CN104769735A (zh) | 2015-07-08 |
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