JP5256643B2 - Method for producing conjugated polymer - Google Patents

Description

  The present invention relates to a method for producing a conjugated polymer, a conjugated polymer synthesized by the production method, an organic electronics element and an organic electroluminescence element using the conjugated polymer.

  Organic electronics elements are elements that perform electrical operations using organic substances, and are expected to exhibit features such as energy saving, low cost, and flexibility, and are attracting attention as a technology that can replace conventional inorganic semiconductors based on silicon. ing.

  Among organic electronics elements, organic EL elements are attracting attention as applications for large-area solid-state light sources as an alternative to incandescent lamps and gas-filled lamps, for example. In addition, it has attracted attention as a leading self-luminous display that replaces liquid crystal displays (LCDs) in the field of flat panel displays (FPDs), and commercialization is progressing as a low-power consumption full-color FPD.

  Organic EL elements are roughly classified into two types, low molecular organic EL elements and polymer organic EL elements, depending on the materials and film forming methods used. High-molecular organic EL elements are composed of high-molecular materials, and can be used for simple film formation such as printing and ink-jet compared to low-molecular organic EL elements that require vacuum-based film formation. Therefore, it is an indispensable element for future large-screen organic EL displays.

  Until now, the polymer type organic EL element includes any one of conjugated polymers such as poly (p-phenylene-vinylene) (for example, see Patent Document 1) and non-conjugated polymers (for example, see Non-Patent Document 1). A number of polymeric materials have been used. However, the light emission lifetime as an element is low, which has been an obstacle to constructing a full-color display.

  In order to solve these problems, in recent years, polymer type organic EL devices using various polyfluorene type and poly (p-phenylene) type conjugated polymers have been proposed. Nothing is found to be satisfactory. One of useful methods for synthesizing conjugated polymers such as polyfluorene type and (p-phenylene) type is the Suzuki coupling reaction (see Non-Patent Document 2). This reaction usually uses a palladium catalyst, a water-soluble alkali carbonate or bicarbonate inorganic base, and a solvent, and optionally a polymer product, as the reaction source system. The monomer of the reaction source is typically a diboronic acid monomer or diboronate monomer and a dibromide monomer.

  Patent Document 2 is an attempt to produce a conjugated polymer from an aromatic monomer by improving the Suzuki coupling reaction. According to Patent Document 2, such a reaction requires a nonpolar solvent such as toluene. However, this type of non-polar solvent is recognized as reducing the reaction rate. In order to overcome such drawbacks, Patent Document 2 proposes to increase the reaction rate by using a phase transfer catalyst such as tricapryl ammonium chloride called aliquot (registered trademark). Therefore, the reaction mixture contains an organic solvent such as toluene, an inorganic base such as sodium bicarbonate, an amount of palladium complex required as a catalyst, and an amount of phase transfer catalyst required as a catalyst.

  Patent Document 3 is an improvement of the method of Patent Document 2. According to Patent Document 3, when an organic base is used, the reaction time required for the polymerization is shortened and the reproducibility is good as compared with the method according to Patent Document 2 using an inorganic base. Also, since no alkali carbonates or bicarbonates are used in the reaction, the final purification process to remove alkali metal contaminants that degrade the properties of polymer materials in many applications, and such alkali metals are mixed. There is an additional advantage that it is not necessary to take measures to avoid this. In addition, the polymer synthesized through this reaction route has a smaller amount of palladium than the polymer synthesized by the method according to the prior art.

However, in the above reaction using a Pd catalyst, it is pointed out that P bonded as a ligand of the Pd catalyst is taken into the polymer (Non-patent Document 3). It is considered that incorporation of P into the polymer causes deterioration in organic EL device characteristics and electrical characteristics such as structural changes such as the introduction of a branched structure, and breakdown of the conjugated structure due to phosphine oxide.
International Publication No. 90/13148 Pamphlet US Pat. No. 5,777,070 International Publication No. 00/53656 Pamphlet I. Sokolik et al. , J .; Appl. Phys. 1993.74, 3584 Synthetic Communications 11 (7), 513, 1981 Macromolecules 1998, 31, 2047

  An object of the present invention is to provide a method for producing a conjugated polymer useful as a material for an organic electronics element, a conjugated polymer, and an organic electronics element and an organic electroluminescence element that are excellent in electrical characteristics. To do.

  As a result of intensive studies, the inventors have obtained a conjugated polymer obtained by using a palladium catalyst in which a specific phosphine ligand is coordinated to palladium (Pd) when synthesizing a conjugated polymer using the Suzuki coupling reaction. It has been found that the P content can be reduced, and the present invention has been completed.

  That is, the present invention is characterized by the following items (1) to (7).

（式中、Ａｒ_１〜Ａｒ_３は、各々独立に、電子吸引性置換基を少なくとも１つ以上有する１価のアリール基または１価のヘテロアリール基である。）
で表されるホスフィン配位子とパラジウムとからなる触媒を用いることを特徴とする共役ポリマーの製造方法。 (1) A method for producing a conjugated polymer using a Suzuki coupling reaction, which has the following general formula

(In the formula, Ar _{1 to} Ar ₃ are each independently a monovalent aryl group or a monovalent heteroaryl group having at least one electron-withdrawing substituent.)
The manufacturing method of the conjugated polymer characterized by using the catalyst which consists of a phosphine ligand represented by these, and palladium.

  (2) The electron-withdrawing substituent is selected from the group consisting of a fluoro group, a fluorinated alkyl group, a chloro group, a nitro group, a cyano group, an aldehyde group, a carboxylic acid group, an ester group, and an acyl group. The manufacturing method of the conjugated polymer as described in said (1).

  (3) The method for producing a conjugated polymer according to (1), wherein the electron-withdrawing substituent is selected from the group consisting of a fluoro group, a fluorinated alkyl group, a chloro group, a nitro group, and a cyano group. .

  (4) A conjugated polymer synthesized by the production method according to any one of (1) to (3) above.

  (5) The conjugated polymer as described in (4) above, wherein the phosphorus content is 50 ppm or less.

  (6) An organic electronic device using the conjugated polymer as described in (4) or (5) above.

  (7) An organic electroluminescence device comprising the conjugated polymer according to (4) or (5) above.

  In the present invention, the term “conjugated polymer” means a completely conjugated polymer, in other words, a polymer conjugated over the entire length of the polymer chain, or a partially conjugated polymer, in other words, It refers to any polymer that includes both conjugated and non-conjugated moieties.

  According to the production method of the present invention, a conjugated polymer having an extremely small P content can be obtained. Therefore, an organic electronic device and an organic electroluminescent device having excellent electrical characteristics using the conjugated polymer are provided. It becomes possible to do.

  Hereinafter, the best mode for carrying out the invention will be described in detail.

  The raw material monomer that can be used in the method for producing a conjugated polymer of the present invention (Suzuki coupling reaction) is not particularly limited as long as it has a functional group suitable for causing the Suzuki coupling reaction. The first form is a polymerization of a first reactive dihalogenated monomer and a second monomer having two boron derivative functional groups. The first monomer and the second monomer may be the same monomer or different monomers. If the monomers are the same, a homopolymer is formed. If the monomers are different, a copolymer is formed. In the second form, a homopolymer is formed by polymerization of a single monomer having a boron derivative functional group and a reactive halide functional group. Also in the second embodiment, a copolymer can be obtained by polymerizing two or more types of monomers having both functional groups and different from each other.

The preferred reactive halide functional group in the reactive dihalogenated monomer or the monomer having the reactive halide functional group is Br or I. However, in addition to these, chlorine, triflate (CF ₃ SO ₃ ⁻ ), tosylate or mesylate may be used.

As the boron derivative functional group, a boronic acid group represented by —B (OH) ₂ , and boron represented by —B (OR ¹ ) (OR ² ) or —B (OR ⁵ O) as a suitable one. An acid ester group, a borane group exemplified by —BR ³ BR ⁴ is preferable. Here, R ¹ and R ² are each independently H or an alkyl group having 1 to 6 carbon atoms, and may or may not be substituted. Moreover, R < ³ >, R < ⁴ > is a C1-C6 alkyl group mutually independently, and does not need to be substituted but may be substituted. R ⁵ is an ester ring in which a divalent hydrocarbon radical finally becomes a 5-membered or 6-membered ring. The divalent hydrocarbon radical may not be substituted but may be substituted. Suitable functional groups for R ⁵ include alkylene groups having 2 or 3 carbon atoms, ortho- or meta-phenylene groups. In addition, these alkylene groups and phenylene groups may not be substituted and may be substituted. Suitable boronic acid ester groups correspond to, for example, alcohols having 1 to 6 carbon atoms, ethanediols such as pinacol, ortho aromatic diols such as propanediol or 1,2-dihydroxybenzene. Products from esterification with boronic acids are included.

  In order to obtain a conjugated polymer suitable as a material for an organic electronics element, as a raw material monomer, for example, an aromatic monomer such as arylene, heteroarylene, or biphenylene having the above functional group, or a condensed aromatic such as naphthalene or fluorene It is preferable to use a monomer or the like, and more preferable to use an arylene, heteroarylene, triarylamine or bisarylene vinylene having a functional group as described above, a dialkylphenylene, a dialkoxyphenylene, a substituted thiophene, a substituted It is particularly preferable to use a dialkylfluorene such as thiophene, benzothiadiazole, 9,9-di-n-octylfluorene. In addition, if a functional group is added to a desired position of the polymer chain, a chain composed of several to several tens of relatively small units can be formed in advance from one or more monomers. The term “aromatic monomer” refers to any monomer having a substituent that can be directly substituted with one or more aromatic rings. In the case of monomers having one or more aromatic rings, the functional group can be substituted with either the same aromatic ring or a different aromatic ring.

  The reaction solvent that can be used in the production method of the present invention is preferably one that can dissolve the monomer and the resulting conjugated polymer, and does not significantly inhibit this reaction. Examples of such a solvent include, but are not limited to, aromatic organic solvents such as benzene, toluene, and xylene, ether organic solvents such as diethyl ether, tetrahydrofuran, and dioxane, acetonitrile, dimethylformamide, dimethyl sulfoxide, Examples include hexamethylphosphotriamide. For example, when the conjugated polymer is a polyfluorene derivative or a poly (p-phenylene) derivative, a non-polar aromatic solvent such as anisole, benzene, ethylbenzene, mesitylene, or xylene can be used, and toluene or anisole is preferable. .

  The monomer concentration in the solvent is preferably 0.01 to 3.0 mol / L, more preferably 0.05 to 1.5 mol / L. When the monomer concentration is low, it takes time for the reaction and it is difficult to obtain a high molecular weight conjugated polymer. When the monomer concentration is high, the viscosity of the solvent is likely to increase, and a uniform reaction is unlikely to occur. These numerical values are calculated based on the total number of moles of monomers used.

（式中、Ａｒ_１〜Ａｒ_３は、各々独立に、電子吸引性置換基を少なくとも１つ以上有する１価のアリール基または１価のヘテロアリール基である。）
で表されるホスフィン配位子とパラジウムとからなる触媒を用いて共役ポリマーを合成する。 In the production method of the present invention, the following general formula

(In the formula, Ar _{1 to} Ar ₃ are each independently a monovalent aryl group or a monovalent heteroaryl group having at least one electron-withdrawing substituent.)
A conjugated polymer is synthesized using a catalyst comprising a phosphine ligand represented by

According to “J. Am. Chem. Soc. Vol. 119, No. 51, 1997”, the insertion reaction of P into the polymer passes through the phosphonium salt intermediate 2 as shown in the following reaction formula: It is presumed that the exchange reaction between the aryl group (Ar) bonded to P and the aryl group (Ar ′) bonded to Pd proceeds. Therefore, it is considered that by introducing an electron-withdrawing aryl group or heteroaryl group (Ar) that lowers the electron density of P, formation of the intermediate (2) is inhibited and the P insertion reaction can be suppressed.

  The electron-withdrawing substituent means a substituent having a substituent constant larger than 0 according to Hammett's rule. The Hammett's rule σ value can be obtained from, for example, “Chem. Rev. 1991, 91, 165-195”. The electron-withdrawing substituent is more preferably 0.05 or more from the viewpoint of lowering the electron density of P and suppressing side reactions of P insertion. At least one electron-withdrawing substituent is bonded to the monovalent aryl group or heteroaryl group in the phosphine ligand represented by the above general formula. Any number may be combined. In general, Hammett's rule recognizes additivity in the effects of substituents. If the total σ is a positive value, even if electron-donating substituents such as hydroxyl groups, alkyl groups, and alkoxy groups are bonded. Good. Since σ at the o-position may have steric hindrance or special interaction, there is no exact substituent constant. However, since it is considered that the electronic effect has the same resonance effect and induction effect as the p-position, it can be estimated that it has at least the same σ as the p-position.

  As the electron-withdrawing substituent, for example, a fluoro group, a fluorinated alkyl group, a chloro group, a nitro group, a cyano group, an aldehyde group, a carboxylic acid group, an ester group, an acyl group and the like are preferable. From the viewpoint, a fluoro group, a fluorinated alkyl group, a chloro group, a nitro group, and a cyano group are more preferable, and a fluoro group and a fluorinated alkyl group are more preferable.

  Examples of the aryl group include phenyl, biphenyl, terphenyl, naphthyl, anthryl, phenanthryl, fluorenyl, anthracenyl, pyrenyl, chrysenyl, picenyl, and perylenyl groups. Of these, a phenyl group is more preferred because of the high reactivity of Suzuki coupling.

  Examples of the heteroaryl group include pyrrolyl, pyridyl, pyradazinyl, pyrimidinyl, quinolyl, isoquinolyl, furyl, thienyl, oxazolyl, thiazolyl, benzoxazolyl, benzothiazolyl, Examples thereof include a benzimidazolyl group.

  Although it does not specifically limit as a palladium compound used in order to prepare the said catalyst, For example, tetravalent palladium compounds, such as sodium hexachloro palladium (IV) acid tetrahydrate and potassium hexachloro palladium (IV), palladium chloride ( II), palladium (II) bromide, palladium (II) acetate, palladium acetylacetonate (II), dichlorobis (benzonitrile) palladium (II), dichlorobis (acetonitrile) palladium (II), dichlorobis (triphenylphosphine) palladium (II), divalent palladium compounds such as dichlorotetraamminepalladium (II), dichloro (cycloocta-1,5-diene) palladium (II), palladium trifluoroacetate (II), palladium (I) tri- monovalent palladium compounds such as ert-butylphosphine bromide dimer, tris (dibenzylideneacetone) dipalladium (0), tris (dibenzylideneacetone) dipalladium chloroform complex (0), tetrakis (triphenylphosphine) palladium (0 ), Zerovalent palladium compounds such as bis (tri-tert-butylphosphine) palladium (0), and the like.

  Although the usage-amount of the said palladium compound is not specifically limited, Usually, it is the range of 0.0001-20 mol% in conversion of palladium with respect to 1 mol of halogenated monomers. If the palladium compound is within the above range, it can be synthesized. However, in order to further improve the activity and proceed the polymerization, and since an expensive palladium compound is used, the more preferable amount of the palladium compound used is 1 mole of halogenated monomer. On the other hand, it is the range of 0.001-5 mol% in terms of palladium.

  What is necessary is just to use the usage-amount of the said phosphine ligand in the range of 0.01-10000 times mole normally with respect to the said palladium compound. In order to further improve the activity, and since an expensive phosphine ligand is used, it is more preferably in the range of 0.1 to 10 moles relative to the palladium compound. In addition, the catalyst in this invention can be prepared by mixing and stirring the said palladium compound and the said phosphine ligand in a suitable solvent, for example. In the present invention, a commercially available palladium catalyst having the above phosphines may be used. In this case, the above preparation is not necessary.

  The base that can be used in the production method of the present invention is not particularly limited as long as it is selected from inorganic bases and / or organic bases. Examples of the inorganic base include sodium carbonate, potassium carbonate, cesium carbonate, potassium phosphate and the like. Moreover, it is used in the state of aqueous solution, for example, is 1M-2M potassium carbonate etc. The amount of the base only needs to be larger than the molar amount of the monomer, preferably 5 times or more, more preferably 10 times or more, relative to the halide monomer. Examples of organic bases include alkylammonium hydroxide, alkylammonium carbonate, alkylammonium bicarbonate, alkylammonium boronate, 1,5-diazabicyclo [4.3.0] non-5-ene (DBN) 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU), 1,4-diazabicyclo [2.2.2] octane (DABCO), dimethylaminopyridine (DMAP), pyridine, trialkyl Examples thereof include alkylammonium fluorides such as amine and tetraalkylammonium fluoride, and tetraalkylammonium hydroxides such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, and tetra-n-propylammonium hydroxide. Is preferred. The organic base is preferably at least 1.5 equivalents, more preferably at least 2 equivalents, relative to the halide monomer.

  Examples of the phase transfer catalyst that can be used in the production method of the present invention include tetraalkyl ammonium halide, tetraalkyl ammonium hydrogen sulfate, and tetraalkyl ammonium hydroxide. However, when a tetraalkylammonium hydroxide is used as the base, a phase transfer catalyst may not be used. Specific examples include tricaprylalkylammonium chloride. The amount of the phase transfer catalyst is preferably 1 to 8% by weight, more preferably 2 to 4% by weight, based on the reaction solvent. If the amount is too small, the reaction does not proceed easily. If the amount is too large, the removal of the phase transfer catalyst by purification becomes complicated.

  The production method of the present invention can be carried out under normal pressure or under pressure. Moreover, it is preferable to carry out in inert gas atmosphere, such as nitrogen and argon, in order to prevent side reactions, such as an oxidation reaction and catalyst deactivation of a conjugated polymer. The reaction temperature in the present invention is preferably 50 to 150 ° C, more preferably 70 to 130 ° C. If the reaction temperature is too low, the reaction takes a long time and the yield decreases. On the other hand, if the reaction temperature is too high, side reactions tend to proceed. Moreover, when making it react, you may heat, irradiating a microwave. In addition, the reaction time in the present invention is not constant depending on the amount of the solvent, monomer, base, catalyst composed of palladium compound and phosphine ligand and the reaction temperature, but preferably from the range of several minutes to 72 hours. select. After completion of the reaction, the desired conjugated polymer can be obtained by treatment by a conventional method.

  The conjugated polymer obtained by the production method of the present invention is suitable as a material for organic electronics elements, particularly as a material for organic electroluminescence elements (organic EL elements). It can be used as an active layer such as a hole transport layer, an electron block layer, a light emitting layer, a hole block layer, an electron transport layer, and an electron injection layer.

  Examples of the conjugated polymer suitable for the organic electronics element material obtained by the production method of the present invention include, as the main skeleton, poly (arylene) such as polyphenylene, polyfluorene, polyphenanthrene, and polypyrene or a derivative thereof, polythiophene, and polyquinoline. , Poly (heteroarylene) or derivatives thereof such as polycarbazole, poly (arylene vinylene) or derivatives thereof, polymers or oligomers containing poly (arylene ethynylene) or derivatives thereof, and as units (ie main skeletons) It may be a side chain structure as well as the inside structure), benzene, naphthalene, anthracene, phenanthrene, chrysene, rubrene, pyrene, perylene, indene, azulene, adamantane, fluorene, fluoreno , Dibenzofuran, carbazole, dibenzothiophene, furan, pyrrole, pyrroline, pyrrolidine, thiophene, dioxolane, pyrazole, pyrazoline, pyrazolidine, imidazole, oxazole, thiazole, oxadiazole, triazole, thiadiazole, pyran, pyridine, piperidine, dioxane, morpholine, Pyridazine, pyrimidine, pyrazine, piperazine, triazine, trithiane, norbornene, benzofuran, indole, benzothiophene, benzimidazole, benzoxazole, benzothiazole, benzothiadiazole, benzoxadiazole, purine, quinoline, isoquinoline, coumarin, cinnoline, quinoxaline, Acridine, phenanthroline, phenothiazine, flavone, tripheni Low molecular weight compounds having these skeletons, such as amines, acetylacetone, dibenzoylmethane, picolinic acid, siloles, porphyrins, iridium and other metal coordination compounds, or polymers or oligomers containing the structure of their derivatives. It may be. Especially, it has a polymer or oligomer containing poly (arylene) or a derivative thereof, poly (heteroarylene) or a derivative thereof as a main skeleton, and benzene, naphthalene, anthracene, phenanthrene, pyrene, fluorene, dibenzofuran as a unit. , Carbazole, dibenzothiophene, furan, thiophene, oxadiazole, triazole, thiadiazole, pyridine, triazine, benzothiophene, benzimidazole, benzoxazole, benzothiazole, benzothiadiazole, benzooxadiazole, quinoline, isoquinoline, acridine, phenanthroline, Polymers containing metal coordination compounds such as triphenylamine, acetylacetone, dibenzoylmethane, iridium, etc., or derivatives thereof Or conjugated polymer with oligomer are preferred.

  The conjugated polymer obtained by the production method of the present invention preferably has a phosphorus content of 50 ppm or less, more preferably 20 ppm or less. By producing an organic electronic device using a conjugated polymer having a phosphorus content of 50 ppm or less, the electrical characteristics of the device can be made more excellent.

  Moreover, even if various additives are added to the conjugated polymer of the present invention, it can be used as a material for organic electronics elements or a material for organic EL elements. As an additive, for example, a metal complex containing a central metal such as Ir or Pt is used for a light emitting layer of an organic EL element, and a triphenylamine derivative is used for a hole injection layer or a hole transport layer. , Electron acceptors such as tetracyanoquinodimethane, and various oxidizing agents can be used.

  The organic electronics element and the organic EL element of the present invention are not particularly limited as long as they have an active layer made of the conjugated polymer of the present invention as described above or a material containing the conjugated polymer. The general structure of organic EL is disclosed in, for example, US Pat. No. 4,539,507, US Pat. No. 5,151,629, etc., and polymer-containing organic EL elements Is disclosed in, for example, International Publication No. WO 90/13148 and European Patent Publication No. 04384861. These usually include an electroluminescent layer (light-emitting layer) between a cathode (cathode) and an anode (anode) in which at least one of the electrodes is transparent. Furthermore, one or more electron injection layers and / or electron transport layers are inserted between the electroluminescent layer (light emitting layer) and the cathode, one or more hole injection layers and / or hole transport In some cases, a layer is inserted between the electroluminescent layer (light emitting layer) and the anode.

  The cathode material is preferably a metal or metal alloy such as Li, Ca, Mg, Al, In, Cs, Ba, Mg / Ag, LiF, and CsF. As an anode material, a metal (for example, Au) or other material having metal conductivity, for example, an oxide (for example, ITO: indium oxide / tin oxide) on a transparent substrate (for example, glass or transparent polymer). It can also be used.

  In order to form an active layer of an organic electronic device using the conjugated polymer of the present invention or a material containing the same, for example, a solution containing the conjugated polymer of the present invention or a material containing the same is used, for example, an inkjet method, a cast Coating on a desired substrate by a known method such as a printing method, immersion method, letterpress printing, intaglio printing, offset printing, flat plate printing, letterpress reverse printing, screen printing, gravure printing, and spin coating. This can be achieved by irradiation, or heat treatment after light irradiation or simultaneously with light irradiation. By repeating this, it is possible to increase the number of organic electronics elements and organic EL elements.

  The application method can be carried out usually in a temperature range of -20 to + 300 ° C, preferably 10 to 100 ° C, particularly preferably 15 to 50 ° C, and the solvent used in the solution is not particularly limited. Are, for example, chloroform, methylene chloride, dichloroethane, tetrahydrofuran, toluene, xylene, mesitylene, anisole, acetone, methyl ethyl ketone, ethyl acetate, butyl acetate, ethyl cellosolve acetate and the like.

  In addition, a light source such as a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a metal halide lamp, a xenon lamp, a fluorescent lamp, a light emitting diode, or sunlight can be used for the light irradiation. Moreover, the said heat processing can be performed on a hotplate or in oven, and can be implemented at the temperature range of 0- + 300 degreeC, Preferably it is 20-250 degreeC, Most preferably, it is 80-200 degreeC.

  The thickness of the active layer is not particularly limited, but is preferably 10 to 100 nm, more preferably 20 to 60 nm, and still more preferably 20 to 40 nm.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples.

<Preparation of Pd catalyst 1>
In a glove box under a nitrogen atmosphere, tris (dibenzylideneacetone) dipalladium (73.2 mg, 80 μmol) was weighed into a sample tube at room temperature, anisole (15 ml) was added, and the mixture was stirred for 30 minutes. Similarly, the sample tube tris (2,3,4,5,6-pentafluorophenyl) phosphine (340.6mg, 640μmol) were weighed, anisole (5ml) was added and stirred for 5 minutes. These solutions were mixed and stirred at room temperature (25 ° C.) for 30 minutes to form a catalyst.

<Preparation 2 of Pd catalyst>
In a glove box under a nitrogen atmosphere, tris (dibenzylideneacetone) dipalladium (73.2 mg, 80 μmol) was weighed into a sample tube at room temperature, anisole (15 ml) was added, and the mixture was stirred for 30 minutes. Similarly, triphenylphosphine (167.9 mg, 640 μmol) was weighed in a sample tube, anisole (5 ml) was added, and the mixture was stirred for 5 minutes. These solutions were mixed and stirred at room temperature (25 ° C.) for 30 minutes to form a catalyst.

Example 1
<Synthesis 1 of poly (9,9-di-n-octylfluorene)>
Under a nitrogen atmosphere, 2,7-dibromo-9,9-dioctylfluorene (0.4 mmol) and 9,9-dioctylfluorene diboronate (0.4 mmol) were added to a three-necked round bottom flask, and anisole (3.0 ml) was added. ), The solution (1.0 ml) prepared in Preparation 1 of Pd catalyst was added and stirred for 30 minutes, and then 20% tetraethylammonium hydroxide aqueous solution (4.0 ml) and water (4.0 ml) were added. It was heated and refluxed at 95 ° C. for 24 hours with vigorous stirring. All the operations so far were performed under a nitrogen stream.

After completion of the reaction, the reaction mixture was poured into methanol-water (9: 1) (150 mL). The resulting precipitate was suction filtered and washed with methanol-water (9: 1). The obtained precipitate was dissolved in toluene, reprecipitated from methanol-water (9: 1) (150 mL), the resulting precipitate was suction filtered, and washed with methanol-water (9: 1). The obtained precipitate was dissolved again in toluene and reprecipitated from methanol-acetone (8: 3) (90 ml). The resulting precipitate was suction filtered and washed with methanol-acetone (8: 3). The obtained precipitate was dissolved again in toluene and reprecipitated from methanol-acetone (8: 3) (90 ml), and the obtained precipitate was vacuum-dried to obtain the desired product (yield 78.3%). ³¹ performs P-NMR measurement, confirming that the tris (2,3,4,5,6-pentafluorophenyl) phosphine and tris (2,3,4,5,6-pentafluorophenyl) phosphine oxide is not present did. The weight average molecular weight Mw was measured by GPC (polystyrene conversion) using THF as an eluent. Quantitative analysis of P was performed by ICP mass spectrometry on a polymer weighed and thermally decomposed with sulfuric acid, nitric acid and perchloric acid, treated with hydrochloric acid and nitric acid, and made into a constant volume solution with dilute hydrochloric acid. The results are shown in Table 1.

(Example 2)
<Synthesis 2 of poly (9,9-di-n-octylfluorene)>
As a microwave synthesis reaction apparatus, MicroSYNTH manufactured by Milestone General was used. The reaction was carried out using a dedicated polyfluorinated ethylene fiber reaction vessel. The solvent was used after degassing with a nitrogen bubble for 30 minutes or more. 2,7-Dibromo-9,9-dioctylfluorene (0.4 mmol) and 9,9-dioctylfluorene diboronic acid ester (0.4 mmol) were added to the reaction vessel, and anisole (3.0 ml), preparation of Pd catalyst After adding the solution prepared in 1 (1.0 ml) and stirring for 30 minutes, 20% tetraethylammonium hydroxide aqueous solution (4.0 ml) and water (4.0 ml) were added. All the operations so far were performed in a glove box under a nitrogen atmosphere.

  The reaction vessel was sealed under a nitrogen atmosphere, set in a microwave reactor, heated from room temperature to 90 ° C. over 10 minutes by microwave irradiation, and then reacted at 90 ° C. for 120 minutes to obtain the desired product ( Yield 80.2%). The temperature control was performed by measuring the internal temperature with a temperature sensor immersed in the reaction solution and controlling the microwave output. Purification and analysis were performed in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 1)
<Synthesis 3 of poly (9,9-di-n-octylfluorene)>
The synthesis was performed in the same manner as in Example 2 except that the solution (1.0 ml) prepared in Pd catalyst preparation 2 was used instead of the solution (1.0 ml) prepared in Pd catalyst preparation 1. . Purification and analysis were performed in the same manner as in Example 1 (yield 77.2%). The results are shown in Table 1.

(Examples 3 and 4)
<Synthesis 4 of poly (9,9-di-n-octylfluorene)>
A conjugated polymer was synthesized in the same manner as in Example 2 except that the compounds described in Table 2 were used as raw material monomers. Purification and analysis were performed in the same manner as in Example 1. The results are shown in Table 3.

(Comparative Examples 2 and 3)
A conjugated polymer was synthesized in the same manner as in Examples 3 and 4 except that the solution (1.0 ml) prepared in Preparation 2 of Pd catalyst was used as the catalyst. Purification and analysis were performed in the same manner as in Example 1. The results are shown in Table 3.

  As shown in Tables 1 and 2, it is clear that the conjugated polymers synthesized in the examples have a very low P content in the polymers compared to the comparative examples.

Claims (1)

  A method for producing a conjugated polymer using a Suzuki coupling reaction, characterized by using a catalyst comprising tris (2,3,4,5,6-pentafluorophenyl) phosphine and palladium. A method for producing a conjugated polymer having an amount of 50 ppm or less.