WO2014037291A1 - Tricyanoborate alkyl ethers - Google Patents

Tricyanoborate alkyl ethers Download PDF

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WO2014037291A1
WO2014037291A1 PCT/EP2013/068048 EP2013068048W WO2014037291A1 WO 2014037291 A1 WO2014037291 A1 WO 2014037291A1 EP 2013068048 W EP2013068048 W EP 2013068048W WO 2014037291 A1 WO2014037291 A1 WO 2014037291A1
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Christiaan RIJKSEN
Lothar Ott
Stefan Ellinger
Govert VERSPUI
Florencio Zaragoza Doerwald
Thomas Jagusch
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Lonza Ltd
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    • C07F5/02Boron compounds
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    • H01G9/20Light-sensitive devices
    • H01G9/2004Light-sensitive devices characterised by the electrolyte, e.g. comprising an organic electrolyte
    • H01G9/2013Light-sensitive devices characterised by the electrolyte, e.g. comprising an organic electrolyte the electrolyte comprising ionic liquids, e.g. alkyl imidazolium iodide
    • HELECTRICITY
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    • H01G11/54Electrolytes
    • H01G11/58Liquid electrolytes
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    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G9/00Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/20Light-sensitive devices
    • H01G9/2027Light-sensitive devices comprising an oxide semiconductor electrode
    • H01G9/2031Light-sensitive devices comprising an oxide semiconductor electrode comprising titanium oxide, e.g. TiO2
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    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
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    • H01G9/20Light-sensitive devices
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    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E10/542Dye sensitized solar cells

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Abstract

The invention relates to tricyanoborate alkyl ethers, a method for their preparation and their use as ionic liquids.

Description

Tricyanoborate alkyl ethers
The invention relates to tricyanoborate alkyl ethers, a method for their preparation and their use as ionic liquids.
BACKGROUND OF THE INVENTION
The term "ionic liquid" (IL) is usually used to refer to a salt which is liquid at temperatures below 100°C, in particular at room temperature. Such liquid salts typically comprise organic cations and organic or inorganic anions, and are described inter alia in P. Wasserscheid et al., Angew. Chem., 2000, 1 12, 3926-3945.
Ionic liquids have a series of interesting properties: Usually, they are thermally stable, relatively non-flammable and have a low vapour pressure. They show good solvability for numerous organic and inorganic substances. In addition, ionic liquids have interesting electrochemical properties, for example electrical conductivity which is often accompanied by a high electrochemical stability.
These attributes give rise to many applications of ionic liquids: They can be used foremost as solvent in synthesis, as electrolyte, as lubricant and as hydraulic fluid. Moreover they serve as phase-transfer catalyst, as extraction medium, as heat-transfer medium, as surface-active substance, as plasticizer, as conductive salt, organic salt or additive in electrochemical cells, as electrolyte, as component in electrolyte formulations, wherein such electrolyte formulation comprising an ionic liquid is preferably used in electrochemical and/or optoelectronic device such as a photovoltaic cell, a light emitting device, an electrochromic or photo-electrochromic device, an electrochemical sensor and/or biosensor, particularly preferred in a dye sensitized solar cell.
Therefore, there is a fundamental need for ionic liquids having a variety of properties which open up additional opportunities for their use.
WO2012/041434 discloses the use of specific ionic liquids as component in electrolyte formulations, in particular in electrolyte formulations for electrochemical or optoelectronic devices such as dye sensitized solar cells.
WO 2010/086131 A discloses tricyanoborates of the general formula Catn+[B(CN)3(XRl)]n", wherein Rl is inter alia Ci_6 alkyl; X is inter alia oxygen; and Catn is a cation, which is selected from the group consisting of an inorganic cation and an organic cation; with n being 1 or 2.
There was a need for stable compounds which can be used as ionic liquids or as precursors of ionic liquids. These compounds should be able to be disposed of in an environmentally friendly manner after use. They should show good performance in applications for ionic liquids, e.g. such as dye sensitized solar cells.
This task object is achieved by tricyanoborates with a fourth substituent, the fourth substituent being an alkyloxy-alkoxy residue.
Unexpectedly, the compounds of instant invention show good efficiency in dye sensitized solar cells. In this text, the following meanings are used, if not otherwise stated:
alkyl linear or branched alkyl;
Ci_q alkyl refers to any alkyl residue which contains from 1 to q carbon atoms; for example Ci_6 alkyl encompasses inter alia methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, isopentyl (3-methylbutyl), neopentyl (2,2-dimethylpropyl), n-hexyl and isohexyl (4-methylpentyl);
C2-q alkenyl refers to an alkenyl residue which contains from 2 to q carbon atoms and
contains at least one double bond, the carbon chain can be linear or branched; for example C2_4 alkenyl encompasses inter alia ethenyl, 1-methylethenyl, prop-l-enyl, prop-2-enyl, 2-methylprop-2-enyl and buta-l ,3-dienyl;
C2_q alkynyl refers to an alkynyl residue which contains from 2 to q carbon atoms and
contains at least one triple bond, the carbon chain can be linear or branched; for example C2_4 alkynyl encompasses inter alia ethynyl, prop-l-ynyl and prop-2-ynyl;
C6-io aryl refers to an aryl residue which has from 6 to 10 carbon atoms and is
unsubstituted or substituted by 1 , 2, 3 or 4 identical or different substituents
independently from each other selected from the group consisting of Ci_4 alkyl and
Ci_4 alkoxy; for example C6-io aryl encompasses inter alia phenyl, methylphenyl, methoxyphenyl, dimethylphenyl, ethylmethylphenyl, diethylphenyl and naphthyl;
cyclic alkyl or cycloalkyl include cyclo and polycyclo, such as bicyclo or tricyclo,
aliphatic residues; C3_q cycloalkyl refers to a cycloalkyl group having from 3 to q carbon atoms; for example C3_io cycloalkyl encompasses inter alia cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl and cyclodecyl;
Ci_q alkoxy refers to an linear or branched alkoxy group having from 1 to q carbon
atoms; for example Ci_2o alkoxy encompasses inter alia methoxy, ethoxy, propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, tert-butoxy, pentyloxy,
1 ,4-dimethylpentyloxy, hexyloxy, heptyloxy, octyloxy, 1 ,5-dimethylhexyloxy, nonyloxy, decyloxy, 4-ethyl- 1 ,5-dimethylhexyloxy, undecyloxy, dodecyloxy, tridecyloxy, tetradecyloxy and eicosyloxy;
alkylene means a linear or branched alkylene group; e.g. propylene, and e.g. propylene can be connected via its CI and C2 carbon atoms (branched alkylene group), or via its CI and C3 carbon atoms (linear alkylene group);
DCM dichloromethane;
eq. molar equivalent;
halide F , CI , Br or I , preferably F , CI or Br , more preferably CI ;
halogen F, CI, Br or I; preferably F, CI or Br;
IL ionic liquid;
"linear" and "n-" are used synonymously with respect to the respective isomers of alkanes; RT room temperature, it is used synonymously with the expression ambient
temperature;
TMSCN (CH3)3SiCN, i.e. trimethylsilylcyanide;
"wt%", "% by weight" and "weight-%" are used synonymously and mean percent by weight.
SUMMARY OF THE INVENTION
Subject of the invention is a compound of formula (I);
Figure imgf000004_0001
wherein
R101 is Ci_6 alkyl;
R102 is a linear or branched C1-12 alkylene;
Catn+ is a cation, which is selected from the group consisting of inorganic cation
CatINORGn+ and organic cation CatORGn ;
n is 1 or 2;
m is 1, 2, 3 or 4.
DETAILED DESCRIPTION OF THE INVENTION
Preferably,
R101 is Ci_2 alkyl;
m is 1, 2 or 3;
R102 is a linear or branched C2_i2 alkylene. More preferably,
R101 is Ci_2 alkyl;
m is 1 or 2;
R102 is selected from the group consisting of ethylene, propylene, butylene, pentylene, hexylen.
Even more preferably,
R101 is Ci_2 alkyl;
m is 1 or 2;
R102 is selected from the group consisting of ethylene and propylene.
Especially,
R101 is Ci_2 alkyl;
m is 1 or 2;
R102 is ethylene.
Preferably, CatINORGn+ is selected from the group consisting of Li+, Na+, K+, Rb+, Cs+, NH4 +, Ag+, Be2+, Mg2+, Ca2+, Sr2+ and Ba2+; more preferably, CatlNORG is selected from the group consisting of Li , Na , K , NH4 ,
Ag+, Mg2+, and Ca2+;
even more preferably, CatINORGn+ is selected from the group consisting of Li+, Na+, K+, NH4 + and Ag+;
especially, CatINORGn+ is Li+, Na+, K+ or Ag+; more especially, CatINORGn is Li+ or K+.
Preferably, CatORG contains a heteroatom selected from the group consisting of nitrogi phosphorus, sulfur and oxygen;
more preferably, CatORGn contains a heteroatom selected from the group consisting of nitrogen and phosphorus.
When n is 2, then CatORG is preferably (H3N-CH2-CH2-NH3)2+.
Preferably, n in CatORG is 1.
When n is 1, then CatORG is preferably selected from the group consisting of cation CatORG-A+, CatORG-B+, CatORG-C+, CatOrg-D+ and CatORG-E+;
CatOrg-A+ is (WR2R3R4R5)+,
wherein
W is a nitrogen or phosphorus;
(i) R2, R3, R4 and R5 are identical or different and independently from each other selected from the group consisting of H, Ci_2o alkyl, Ci_2o
perfluoroalkyl, C3-10 cycloalkyl and C6-io aryl, with the proviso, that at least one of the residues R2, R3, R4 and R5 is not H; or
(ii) R2 and R3 together with W form a 5- to 7-membered saturated or unsaturated ring, R4 and R5 are identical or different and independently from each other selected from the group consisting of H, Ci_2o alkyl, Ci_2o perfluoroalkyl, C3-10 cycloalkyl and C6-io aryl; or (iii) R2 and R3 together with W and R4 and R5 together with W form, independently from each other, a 5- to 7-membered saturated or unsaturated ring;
CatOrg-B+ is (XR6R7R8)+,
wherein
X is nitrogen,
R6 and R7 together with X form a 5- to 7-membered unsaturated ring in which X formally has one single bond and one double bond to R6 and R7 respectively,
R8 is selected from the group consisting of Ci_2o alkyl, Ci_2o perfluoroalkyl,
C3-10 cycloalkyl or C6-io aryl;
CatOrg-C+ is (YR9R10R11)+,
wherein
Y is sulphur;
(i) R9, RIO and Rl 1 are identical or different and independently from each other selected from the group consisting of Ci_2o alkyl, Ci_2o perfluoroalkyl, C3-10 cycloalkyl and C6-io aryl; or
(ii) R9 and RIO together with Y form a 5- to 7-membered saturated or unsaturated ring, Rl 1 is selected from the group consisting of Ci_2o alkyl, Ci_2o perfluoroalkyl,
C3-10 cycloalkyl and C6-io aryl;
CatOrg-D+ is (ZR12R13)+,
wherein
Z is oxygen or sulphur;
R12 and R13 together with Z form a 5- to 7-membered ring in which Z formally has one single bond and one double bond to R12 and R13 respectively;
CatORG-E+ is a cyclic C3_9 alkane or a cyclic C3_9 alkene bearing a positive charge;
in case of a cyclic C3-9 alkene, CatORG-E+ has 1, 2 or 3 double bonds; the residues R2, R3, R4, R5, R6, R7, R8, R9, RIO, Rl 1, R12 and R13 are, independently from each other, unsubstituted or, where applicable, substituted by 1, 2 or 3 substituents selected from the group consisting of halogen, cyano and Ci_4 alkoxy; the rings formed by R2 and R3 together with W, R4 and R5 together with W, R6 and R7 together with X, R9 and RIO together with Y and R12 and R13 together with Z contain no, 1 or 2 further heteroatoms, the heteroatoms being selected from the group consisting of O, N and S; and wherein any further heteroatom N can be substituted by Ci_s alkyl or Ci_8 perfluoroalkyl.
The term "where applicable" means e.g., that any of the 1 , 2 or 3 substituents of the residues R2 to R13 requires a respective site, and e.g. in case of R2 being a perfluorinated side chain no respective site is available any more a substituents.
More preferably, CatORGn is selected from the group consisting of ammonium,
phosphonium, sulfonium, pyrrolidinium, pyrrolinium, pyrrolium, pyrazolium, pyrazolinium, imidazolium, imidazolinium, triazolium, oxazolium, thiazolium, piperidinium, piperazinium, morpholinium, pyridinium, pyridazinium, pyrimidinium, pyrazinium, 1 ,3-dioxolium, pyrylium and thiopyrylium, quinoxalinium, indolinium, indolium, cyclopropenylium, 1 ,2,3-triphenylcyclopropenylium, tri-tert- butylcyclopropenylium, 1 ,2,3-tris(diethylamino)cyclopropenylium, 1 ,2,3- tris(trimethylsilyl)cyclopropenylium and tropylium, 1 ,2,3,4,5,6,7- heptaphenylcyclohepta-2,4,6-trien- 1 -ylium.
Even more preferably, CatORG is selected from the group consisting of
Figure imgf000008_0001
, [N(R20)(R21)(R22)R23]+ and [P(R20)(R21)(R22)R23] ; wherein
R20 is Ci_2o alkyl; R21 , R22 and R23 are identical or different and independently selected from the group consisting of H and Ci_2o alkyl; preferably,
R20 is Ci-14 alkyl;
R21 , R22 and R23 are identical or different and independently selected from the group consisting of H and C1 -14 alkyl; more preferably,
R20 is Ci_8 alkyl;
R21 , R22 and R23 are identical or different and independently selected from the group consisting of H and Ci_s alkyl.
Figure imgf000009_0001
[NH(C2H5)3]+, [NH(C4H9)3]+, [N(C2H5)4]+, [N(C4H9)4]+, [P(C2H5)4]+, [P(C4H9)4]+ and [P(C6H13)3(C14H29)]+;
Figure imgf000010_0001
more especially, CatORG is selected from the group consisting of C¾
Figure imgf000010_0002
[N(C4H9)4]+, [P(C2H5)4]+, and [P(C4H9)4]
In another more preferable embodiment, CatORGn is
Figure imgf000010_0003
1 wherein
R20 is Ci_20 alkyl;
R21 is H and Ci_2o alkyl;
preferably,
R20 is Ci-14 alkyl;
R21 is H and C i_i 4 alkyl;
more preferably,
R20 is Ci_8 alkyl;
R21 is H and Ci_8 alkyl;
even more preferably, R20 is methyl and R21 is ethyl.
In particular,
R101 is Ci_2 alkyl;
m is 1 or 2;
R102 is ethylene;
CatINORGn+ is Li+ or K+;
CatORG is
Figure imgf000011_0001
R20 is methyl and R21 is ethyl.
More in particular, compound of formula (I) is selected from the group consisting of compound of formula (1), compound of formula (2), compound of formula (3), compound of formula (4), compound of formula (5), compound of formula (6) and compound of formula (V).
Figure imgf000011_0002
Figure imgf000011_0003
Figure imgf000012_0001
Figure imgf000012_0002
Figure imgf000012_0003
Figure imgf000012_0004
Figure imgf000012_0005
Further subject of the invention is a method for the preparation of compound of formula (I), the method comprises a step (Stl) or a step (St2); step (Stl) comprises a reaction (Real), wherein compound of formula (X) is reacted with trimethylsilylcyanide in the presence of cation Catn ;
Figure imgf000013_0001
step (St2) comprises a reaction (Rea2), wherein a compound of formula (I-Cat-r)
Figure imgf000013_0002
is reacted with a compound of formula (I-Cat-n);
(Catn )(AnINORGq )t (I-Cat-n) q is 1 or 2;
r is 1 or 2;
when n and q are identical, then t is 1 ;
when n is 2 and q is 1 , then t is 2;
when n is 1 and q is 2, then t is 0.5;
AnINORGq is an anion selected from the group consisting of halide, OH", CN , OCN , SCN~, N3 ", sulfate, hydrogensulfate, nitrate, C03 2", HC03 ", BF4 ~, PF6 ", SbF6 ", CF3S03
(CF3S02)2N , (FS02)2N , Ci_6 alkylsulfonate, Ci_6 alkylsulfate, dioctylsulfosuccinate, anions of Ci_2o monocarboxylic aliphatic acids, anions of C2-6 dicarboxylic aliphatic acids, benzoate, phthalates, N(CN)2 ", C(CN)3 ", B(CN)4 ", P(CN)6 ",Sb(CN)6 ", and mixtures thereof;
Cat-/ has the same definition as Catn and is different from Catn ;
Catn , n, m, RlOl and R102 are as defined above, also with all their preferred embodiments.
Preferably, in reaction (Real) cation Cat is present in form a compound (CYAN SALT) and compound (CYANS ALT) is [Catn+][CN]n, with Catn+ and n as defined above, also with all its preferred embodiments;
more preferably, compound (CYANS ALT) is [CatINORGn+][CN]„, with CatINORGn+ and n as defined above, also with all its preferred embodiments;
even more preferably, compound (CYANS ALT) is [CatINORGn+][CN]„, and CatINORGn+
I
is selected from the group consisting of Li , Na , K , NH4 , Mg , and Ca , n is 1 or 2 respectively in this case;
especially, compound (CYANSALT) is [CatINORGn+][CN]„, and CatINORGn+ is selected from the group consisting of Li+, Na+, K+ and NH4 +, n is in this case;
more especially, compound (CYANSALT) is [CatINORGn+][CN]„, and CatINORGn+ is Na+ or K+, n is 1 in this case.
Preferably, from 1.5 to 10 mol equivalents, more preferably from 3 to 5 mol equivalents, of trimethylsilylcyanide are used in reaction (Real), the mol equivalents being based on the mol of compound of formula (X).
Preferably, from 0.8 to 5 mol equivalents, more preferably from 0.9 to 3 mol equivalents, even more preferably from 0.9 to 2 mol equivalents, of Catn+, preferably in form of compound (CYANSALT), are used in reaction (Real), the mol equivalents being based on the mol of compound of formula (Al).
The reaction temperatures of reaction (Real) is preferably from 0 to 250 °C, more preferably from 50 to 200 °C, even more preferably from 50 to 150 °C.
Preferably, reaction (Real) is done at a reaction temperature which is above the boiling point of compound of formula (XX), which is formed during the reaction.
Figure imgf000015_0001
Reaction (Real) can be done in a closed system and at the pressure caused by the chosen temperature.
The reaction time of reaction (Real) is preferably from 30 min to 96 h, more preferably from 1 h to 72 h, even more preferably from 2 h to 48 h. Preferably, reaction (Real) is done under inert atmosphere. Preferably, the inert atmosphere is achieved by the use if an inert gas preferably selected from the group consisting of argon, another noble gas, lower boiling alkane, nitrogen and mixtures thereof.
The lower boiling alkane is preferably a Ci_3 alkane, i.e. methane, ethane or propane. After the reaction, compound of formula (I) can be isolated by standard methods such as evaporation of volatile components, extraction, washing, drying, concentration,
crystallization, chromatography and any combination thereof, which are known per se to the person skilled in the art.
For example, when the reaction product of reaction (Real) is a solid, it is preferably suspended in a solvent (SUSP),
solvent (SUSP) is selected from the group consisting of heptane, DCM, acetonitrile and
mixtures thereof;
then the obtained suspension is filtered and preferably washed. This extraction can be repeated with a different solvent (SUSP). Evaporation, preferably under vacuum, provides compound of formula (I).
Reaction (Rea2) is a metathesis reaction, also called a salt-exchange reaction, in which a first cation is replaced by a second cation. Preferably, AnINORGq is an anion selected from the group consisting of halide, OH", CN~, sulfate, hydrogensulfate, nitrate, C03 2", HC03 ", BF4 ", PF6 ", CF3S03 ", (CF3S02)2N~, (FS02)2N , methyl sulfonate, ethyl sulfonate, methyl sulfate, ethyl sulfate, acetate, oleate, fumarate, maleate, oxalate, benzoate, N(CN)2 , and mixtures thereof; more preferably, AnlNORG^ is an anion selected from the group consisting of CI , OH", GST, sulfate, hydrogensulfate, CO3 2", HCO3 , acetate, and mixtures thereof.
Preferably in case of reaction (Rea2), a compound of formula (I) with Catn being CatORGn is prepared in step (St2) by a reaction (Rea2), wherein a compound of formula (I-Cat-r), wherein Cat-/ has the definition of CatINORGn , is reacted with a compound of formula (I-CatORG)
(CatORGn+)q(AnINORGq")n (I-CatORG) wherein
Catn+, n, CatORGn+, CatINORGn+, q and AnINORGq are as defined above, also with all their preferred embodiments.
Preferably, when n and r are identical, then from 1 to 1.5 mol equivalents, more preferably from 1 to 1.2 mol equivalents, of compound of formula (I-Cat-n) are used in reaction (Rea2), the mol equivalents being based on the mol of compound of formula (I-Cat-r).
Preferably, when n is 2 and r is 1, then from 0.5 to 0.75 mol equivalents, more preferably from 0.5 to 0.6 mol equivalents, of compound of formula (I-Cat-n) are used in reaction (Rea2), the mol equivalents being based on the mol of compound of formula (I-Cat-r). Preferably, when n is 1 and r is 2, then from 2 to 3 mol equivalents, more preferably from 2 to 2.4 mol equivalents, of compound of formula (I-Cat-n) are used in reaction (Rea2), the mol equivalents being based on the mol of compound of formula (I-Cat-r).
The reaction temperatures of reaction (Rea2) is preferably from 0 to 250 °C, more preferably from 10 to 200 °C, even more preferably from 10 to 150 °C. The reaction (Rea2) is preferably carried out in a solvent (Sol2), solvent (Sol2) is preferably selected from the group consisting of water, DCM, ethyl acetate, C5-10 alkane, and mixtures thereof.
C5_io alkane is preferably pentane, hexane or heptane.
In a more preferred embodiment, reaction (Rea2) is done in a biphasic solvent system of water and DCM.
As an alternative, the reaction can also be carried out in the absence of a solvent or in a solvent in which the inorganic salt formed as side product is sparingly soluble or insoluble. As a further alternative, it is also possible to carry out the reaction in an aqueous solution using an ion exchanger loaded with the desired cation Catn .
The amount of solvent is preferably from 2 to 40 fold, more preferably from 3 to 20 fold, of the weight of compound of formula (I-Cat-r).
Reaction (Rea2) can be done in a closed system and at the pressure caused by the chosen temperature.
The reaction time of reaction (Rea2) is preferably from 15 or from 30 min to 48 h, more preferably from 15 min, from 30 min or from 1 h to 24 h, even more preferably from 15 min, from 30 min or from 1 h to 12 h.
Preferably, reaction (Rea2) is done under inert atmosphere. Preferably, the inert atmosphere is achieved by the use if an inert gas preferably selected from the group consisting of argon, another noble gas, lower boiling alkane, nitrogen and mixtures thereof.
The lower boiling alkane is preferably a Ci_3 alkane, i.e. methane, ethane or propane.
Subsequent to reaction (Rea2) there can be a further metathesis reaction or further metathesis reactions.
After reaction (Rea2), compound of formula (I) can be isolated from the reaction mixture by standard methods such as filtration, evaporation of volatile components, extraction, washing, drying, concentration, crystallization, chromatography and any combination thereof, which are known per se to the person skilled in the art. For example, when reaction (Rea2) was done in a biphasic solvent system of water and DCM, the aqueous and organic phases are separated, the organic phase is preferably washed, preferably with water, then preferably dried, preferably with Na2S04, K2C03, CaCl2 or MgS04, and finally evaporated.
Preferably, compound of formula (X) is prepared in a step (StO);
step (StO) is done before step (Stl);
step (StO) comprises a reaction (ReaO), wherein boric acid is reacted with a compound of formula (X-0);
Figure imgf000018_0001
wherein
m, R101 and R102 are as defined above, also with all their preferred embodiments.
Preferably, from 3 to 6 mol equivalents, more preferably from 3 to 5 mol equivalents, of compound of formula (X-0) are used in reaction (ReaO), the mol equivalents being based on the mol of boric acid.
The reaction temperatures of reaction (ReaO) is preferably from 0 to 250 °C, more preferably from 50 to 200 °C, even more preferably from 50 to 150 °C.
Preferably, reaction (ReaO) is done is a solvent (SolO), solvent (SolO) is preferably selected from the group consisting of toluene, xylene and C5-10 alkane.
C5_io alkane is preferably pentane, hexane or heptane.
Reaction (ReaO) can be done in a closed system and at the pressure caused by the chosen temperature.
The reaction time of reaction (ReaO) is preferably from 30 min to 48 h, more preferably from 1 h to 24 h. Preferably, reaction (ReaO) is done under inert atmosphere. Preferably, the inert atmosphere is achieved by the use if an inert gas preferably selected from the group consisting of argon, another noble gas, lower boiling alkane, nitrogen and mixtures thereof.
The lower boiling alkane is preferably a Ci_3 alkane, i.e. methane, ethane or propane.
Compound of formula (X) can be isolated after reaction (ReaO), preferably by distillation.
Further subject of the invention is the use of compound of formula (I), with compound of formula (I) as defined above, also with all its preferred embodiments,
preferably of compound of formula (I) with Catn being CatORGn ,
as solvent, preferably as solvent in inorganic and organic synthesis; as phase-transfer catalyst, as extractant, as heat-transfer medium, as surface-active substance, as plasticizer, as conductive salt, organic salt or additive in electrochemical cells, as electrolyte; as lubricant and as hydraulic fluid, as component in electrolyte formulations, wherein such electrolyte formulations comprising a compound of formula (I), preferably a compound of formula (I) with Catn being CatORGn , are preferably used in electrochemical and/or optoelectronic devices, wherein the electrochemical and/or optoelectronic devices are preferably selected from the group consisting of photovoltaic cell, light emitting device, electrochromic or photo- electrochromic device, electrochemical sensor and/or biosensor, and dye sensitized solar cell, particularly preferred in a dye sensitized solar cell.
In the case of the use of compounds of formula (I) as solvents, these are suitable in any type of reaction known to the person skilled in the art, for example for transition-metal- or enzyme-catalysed reactions, such as, for example, hydroformylation reactions,
oligomerisation reactions, esterifications or isomerisations, where the said list is not exhaustive.
When used as extractant, compound of formula (I) can be employed to separate off reaction products, but also to separate off impurities, depending on the solubility of the respective component in the ionic liquid. In addition, the ionic liquids may also serve as separation media in the separation of a plurality of components, for example in the distillative separation of a plurality of components of a mixture. Further possible applications for compounds of formula (I) are the use as plasticiser in polymer materials and as conductive salt or additive in various electrochemical cells and applications, for example in galvanic cells, in capacitors or in fuel cells.
Further fields of applications of compounds of formula (I), according to this invention, are their use as solvents for carbohydrate containing solids, in particular biopolymers and derivatives or degradation products thereof. In addition, compound of formula (I) can be used as lubricants, working fluids for machines, such as compressors, pumps or hydraulic devices. A further field of application is the field of particle or nanomaterial synthesis where these ionic liquids can act as medium or additive.
Further subject of the invention is the use of compounds of formula (I), with compound of formula (I) as defined above, also with all its preferred embodiments, preferably of compounds of formula (I) with Catn being CatORGn , in electrochemical and/or optoelectronic devices, especially in electrolyte formulations in such electrochemical and/or optoelectronic devices, preferably as electrolyte in such electrochemical and/or optoelectronic devices. Electrolyte formulations comprising a compound of formula (I), preferably a compound of formula (I) with Catn being CatORGn , can be preferably used in batteries, preferably in primary batteries and secondary batteries, in capacitors, in supercapacitors or in
electrochemical cells, optionally also in combination with further conductive salts, additives and/or solvents. Preferred batteries are lithium batteries or lithium-ion batteries. A preferred capacitor is a lithium-ion capacitor.
Electrolyte formulations comprising a compound of formula (I), preferably a compound of formula (I) with Catn being CatORGn , can be preferably used in electrochemical and/or optoelectronic devices such as a photovoltaic cell, a light emitting device, an electrochromic or photo-electrochromic device, an electrochemical sensor and/or biosensor, and a dye sensitized solar cell, particularly preferred in a dye sensitized solar cell. Electrolyte formulations comprising a compound of formula (I), preferably a compound of formula (I) with Catn being CatORGn , are alternatives to already known electrolyte formulations. They show especially in the field of electrolyte formulations of dye sensitized solar cells increased power conversion efficiency particularly under low temperature. The advantage of the use of compounds of formula (I) is their low viscosity, and subsequently the smaller Nernst diffusion resistance of the oxidant species, especially at lower temperature.
Compound of formula (I) exhibit interesting melting points, thermal and electrochemical stability, viscosity, polarity and solubility in water or in organic solvents.
Compounds of formula (I) are halogen- free, which makes inexpensive and environmentally friendly disposal possible, for example by incineration, and they have low corrosivity towards metals, which simplifies their use and storage.
EXAMPLES
Methods
LCMS:
Agilent Instruments 1100 Series
Some mg of the compound were dissolved in MeCN, filtered over a 0.45 μιη Nylon filter and injected (1 μΐ) on a Waters XBridge (C18, 30 x 2.1mm, 3.5 μ) column.
Flow: 1 ml/min Column temp: 35°C
Eluent A: 0.1% formic acid in acetonitrile
Eluent B : 0.1% formic acid in water
Lin. Gradient: t = 0 min 2% A, t = 1.6 min 98% A, t = 3 min 98% A
Detection: DAD (220 to 320 nm)
Detection: MSD (ESI pos/neg) mass range: 100 to 800
Detection: NQAD (Quant QT-500) filter 1.3 sec; evaporation temperature: 35°C
Example 1: Synthesis of compound of formula (A)
Figure imgf000022_0001
Boric acid (50 g) and 2-methoxyethanol (197 g, 3.2 eq.) were refiuxed in toluene (200 ml) in a Dean-Stark apparatus for 17 hours. 89.5 g (47%>) of compound of formula (A) were obtained by fractional distillation under vacuum with a boiling point of 76.5 to 78°C (0.05 mbar). Yield was 47%>. 1H-NMR (400 MHz, CDC13, TMS): delta [ppm] = 3.34 ( s, 3H); 3.47 (t, JH/B = 4Hz, 2H); 3.92 (t, JH/B = 4Hz, 2H)
13C-NMR (100.6 MHz, CDC13, TMS): delta [ppm] = 59.09 (s); 63.26 (s); 72.23 (s)
"B-NMR (160.5 MHz, CDC13, TMS): delta [ppm] = 17.97 (s)
Example 2: Synthesis of compound of formula (1) A suspension of compound of formula (A) (45 g, 0.19 mol, 1 eq., prepared according to example 1) and KCN (12.4 g, 0.19 mol, 1 eq.) in TMSCN (66.2 g, 0.67 mol, 3.5 eq.) was stirred at 70°C for 24 hours and then at 130°C for 20 hours. The crude reaction product was solid and was suspended in heptane (200 ml) and DCM (50 ml) and stirred for 15 minutes. After filtration over a glass filter (pore size P3), 35.44 g (92%) of a solid was obtained. 34.4 g of the solid was suspended in CH3CN (650 ml), stirred for 30 minutes, filtered over celite and washed with CH3CN (500 ml). The filtrate was concentrated under vacuum to provide 32.23 g (94%>) of a reddish orange solid. 30.5 g of the solid was suspended in CH3CN (80 ml), stirred for 60 minutes, filtered over a glass filter (pore size P4) to afford after drying under vacuum 22.96 g (59%o) of compound of formula (1) as a solid, with a melting point (DSC) of ca.
238°C
1H-NMR (400 MHz, CD3CN, TMS): delta [ppm] = 3.30 ( s, 3H); 3.43 to 3.46 (m, 2H); 3.49 (m, 2H)
13C-NMPv (100.6 MHz, CD3CN, TMS): delta [ppm] = 59.13 (s); 65.79 (s); 74.27 (q: J = 4 Hz); 129.06 (q: J = 70 Hz)
"B-NMR (160.5 MHz, CD3CN, TMS): delta [ppm] = -19.08 (t: J = 1.6 Hz)
LCMS [B(CN)3(OCH2CH2OCH3)]": 164 Elementary Analysis:
Figure imgf000023_0002
Example 3: Synthesis of compound of formula (B)
Figure imgf000023_0001
Boric acid (20 g) and 2-(2-ethoxyethoxy)ethanol (135 g, 3.1 eq.) were refluxed in toluene (200 ml) in a Dean-Stark apparatus for 19 hours. 60.7 g (yield 46%) of compound of formula (B) were obtained by fractional distillation at 60°C (0.001 bar).
1H-NMR (400 MHz, CDC13, TMS): delta [ppm] = 1.15 ( br t, J = 8Hz, 3H); 3.45 to 3.54 (m,
8H); 3.89 ( br t, JH/B = 4Hz, 2H)
13C-NMR (100.6 MHz, CDC13, TMS): delta [ppm] = 15.29 (s); 62.81 (s); 66.76 (s); 70.02
(s); 70.68 (s); 71.76 (s)
"B-NMR (160.5 MHz, CDC13, TMS): delta [ppm] = -18.00 (s)
Example 4: Synthesis of compound of formula (2)
A suspension of compound of formula (B) (15 g, 36.6 mmol, 1 eq., prepared according to example 3) and KCN (2.38 g, 36.6 mmol, 1.0 eq.) in TMSCN (12.69 g, 128 mmol, 3.5 eq.) was stirred at 90°C for 19 hours in an autoclave under nitrogen atmosphere. To the suspension was added heptane (66 ml) and DCM (15 ml) and the suspension was filtered over a glass filter (pore size P4). The obtained solid was washed three times with heptane (60 ml) and DCM (15 ml) and dried under vacuum resulting in 7.9 g yield (83%). The dried product was suspended in CH3CN (19 ml), filtered over a glass filter (pore size P4) and dried under vacuum to yield 5.5 g (57%) of compound of formula (2) as a white solid with a melting point (DSC) of ca. 208°C
1H-NMR (400 MHz, CD3CN, TMS): delta [ppm] = 1.15 ( br t, J = 8Hz, 3H); 3.47 to 3.55 (m, 10H)
13C-NMR (100.6 MHz, CD3CN, TMS): delta [ppm] = 15.41 (s); 65.57 (s); 67.10 (s); 70.31
(s); 70.86 (s); 72.27 (q: J = 4 Hz); 128.57 (q: J = 70 Hz)
"B-NMR (160.5 MHz, CD3CN, TMS): delta [ppm] = -19.12 (s)
LCMS [B(CN)3(OCH2CH2OCH2CH2OCH3)]-: 222
Elementary Analysis:
Figure imgf000024_0001
Example 5: Synthesis of compound of formula (3) A solution of l-Ethyl-3 -methyl- IH-imidazo Hum chloride (2.89 g, 19.7 mmol), compound of formula (1) (4.0 g, 19.7 mmol, prepared according to example 2) in water (14.5 ml) was mixed with DCM (29 ml) and stirred at room temperature for 3 hours. After separation of the aqueous from the organic phase, the organic phase was washed with water (5.8 ml), dried over K2CO3 and evaporated on a rotary evaporator yielding 4.33 g (80%) of compound of formula (3) as a slightly yellow solid with a melting point (DSC) of ca. 62°C
1H-NMR (400 MHz, CD3CN, TMS): delta [ppm] = 1.46 ( t, J = 8Hz, 3H); 3.29 (s, 3H); 3.43 to 3.48 (m, 4H); 3.82 (s, 3H); 4.11 (q, J = 8Hz, 3H); 7.33 (s, 1H); 7.38 (s, 1H); 8.42 (s, 1H)
13C-NMR (100.6 MHz, CD3CN, TMS): delta [ppm] = 15.5 (s); 36.8 (s); 45.8 (s); 58.8 (s);
65.5 (s); 74.0 (q: J = 4 Hz); 123.0 (s); 124.7 (s); 128.8 (q: J = 70 Hz)
"B-NMR (160.5 MHz, CD3CN, TMS): delta [ppm] = -19.07 (t, 1.6 Hz)
Elementary Analy
Figure imgf000025_0001
Example 6: Synthesis of compound of formula (4)
A solution of tetraethylammonium chloride (3.26 g, 19.7 mmol) and compound of formula (1) (4.0 g, 19.7 mmol, prepared according to example 2) in water (14.5 ml) was mixed with DCM (29 ml) and stirred at room temperature for 5 hours. After separation of the aqueous from the organic phase, the organic phase was washed with water (5.8 ml), dried over K2C03 and evaporated on a rotary evaporator yielding 5.02 g (87%) of compound of formula (4) as a viscous liquid. After standing some days at RT, it solidified into a glassy colorless substance. 1H-NMR (400 MHz, CD3CN, TMS): delta [ppm] = 1.21 ( t, J = 8Hz, 12H); 3.16 (q, J = 8Hz,
8H); 3.29 (s, 3H); 3.42 to 3.45 (m, 2H); 3.48 (m, 2H)
13C-NMR (100 MHz, CD3CN, TMS): delta [ppm] = 7.7 (s); 53.12 (dt, Jc/N = 3Hz); 58.8 (s);
65.5 (s); 74.0 (q: J = 4 Hz); 128.9 (q: J = 70 Hz)
nB-NMR (160.5 MHz, CD3CN, TMS): delta [ppm] = -19.04 (t, 1.6 Hz )
Elementary Analysis: Element C H N
% expected 57.15 9.25 19.04
% found 47.77 8.00 20.6
Example 7: Synthesis of compound of formula (5)
A solution of tetrabutylphosphonium methanesulfonate (5.02 g, 14.16 mmol), and compound of formula (1) (2.88 g, 14.16 mmol, prepared according to example 2) in water (14.5 ml) was mixed with DCM (29 ml) and stirred at room temperature for 5 hours. After separation of the aqueous from the organic phase, the organic phase was washed with water (5.8 ml), dried over K2C03 and evaporated on a rotary evaporator yielding 5.53 g (92%) of compound of formula (5) as a viscous liquid. 1H-NMR (400 MHz, CD3CN, TMS): delta [ppm] = 0.95 ( t, J = 8Hz, 12H); 1.41 to 1.52 (m, 16H); 2.03 to 2.09 (m, 8H); 3.30 (s, 3H); 3.42 to 3.45 (m, 2H); 3.48 to 3.49 (m, 2H) 13C-NMR (100.6 MHz, CD3CN, TMS): delta [ppm] = 13.6 (s); 18.9 (d, JP/C = 48Hz); 23.9 (d, Jp/c = 5Hz); 24.5 (d, JP/C = 15Hz); 58.8 (s); 65.5 (s); 74.1 (q: J = 4 Hz); 128.9 (q: J = 69 Hz)
"B-NMR (160.5 MHz, CD3CN, TMS): delta [ppm] = -19.03 (t, 1.6 Hz )
Elementary Analysis:
Figure imgf000026_0001
Example 8: Synthesis of compound of formula (6)
A solution of l-butyl-2-methylpyridin-l-ium bromide (4.53 g, 19.7 mmol) and compound of formula (1) (4 g, 19.7 mmol, prepared according to example 2) in water (14.5 ml) was mixed with DCM (29 ml) and stirred at room temperature for 5 hours. After separation of the aqueous from the organic phase, the organic phase was washed with water (5.8 ml), dried over K2CO3 and evaporated on a rotary evaporator yielding 5.34 g (86%) of compound of formula (1) as a viscous liquid. Ή-NMR (400 MHz, CD3CN, TMS): delta [ppm] = 1.05 ( t, J = 8Hz, 3H); 1.47 to 1.54 (m, 2H); 1.90 to 1.94 (m, 2H); 2.87 (s, 3H); 3.36 (s, 3H); 3.49 to 3.54 (m, 4H); 4.52 (br t, J = 8Hz, 3H); 7.88 to 7.95 (m, 2H); 8.39 (m, 1H); 8.65 to 8.66 (m, 1H)
13C-NMR (100.6 MHz, CD3CN, TMS): delta [ppm] = 13.8 (s); 20.2 (s); 20.5 (S); 32.5 (s);
58.85 (s); 58.87 (s); 65.5 (s); 74.1 (q: J = 4 Hz); 126.8 (s); 128.8 (q: J = 70 Hz); 146.1 (d);
155.4 (s)
"B-NMR (160.5 MHz, CD3CN, TMS): delta [ppm] = -19.06 (t, 1.6 Hz )
Elementary Analysis:
Figure imgf000027_0001
Example 9: Synthesis of compound of formula (7)
To compound of formula (2) (5.17 g, 19.8 mmol), prepared according to example 4, were added dichloromethane (40 ml) and l-ethyl-3 -methylimidazolium chloride (2.95 g, 20.1 mmol). The mixture was stirred at room temperature for 26 h. The mixture was then filtered and concentrated under reduced pressure, to yield 6.49 g (98%) of compound of formula (7) as a colorless oil.
1H NMR (400 MHz, CDC13) delta [ppm] = 1.05 (t, J = 7 Hz, 3H), 1.60 (t, J = 7 Hz, 3H), 3.44 (quart, J = 7 Hz, 2H), 3.57 (m, 2H), 3.66 (m, 6H), 3.98 (s, 3H), 4.28 (quart, J = 7 Hz, 2H), 7.32 (s, 2H), 9.01 (s, 1H).
Application example
Compound were tested in dye sensitized solar cells and compared to the compound l-ethyl-3- methylimidazolium tricyanomethoxyborate, called COMP-W0131-Ex2, prepared according to example 2 of WO 2010/086131 Al.
DMII dimethylimidazoliumiodide
EMU ethylmethylimidazo liumiodide
EMI ethylmethylimidazo Hum
NBB n-butylbenzimidazol
GNCS guanidiniumthiocyanid The compound tested is called compound(TEST), compound(TEST) is selected from the group consisting of was compound of formula (7), compound of formula (5) and COMP- W0131-Ex2.
Device fabrication: Photoanodes used to make the devices consisted of a screen-printed nanoparticulate mesoporous Ti02 layers. A 8 μιη thick transparent layer of 20 nm sized Ti02 particles was first printed on the fluorine doped Sn02 (FTO) conducting glass (purchased from NSG with ΙΟΩ/cm2, 4 mm thick) and subsequently coated with a 5 μιη thick second layer of 400 nm light-scattering anatase particles (CCIC, Japan). Detailed procedures for the preparation of Ti02 nanoparticles and pastes are reported in Ito, S. et al, Prog. Photovolt. Res. AppL, 2007, 15, 603. A standard C106 dye with CAS 1165943-93-0 was used as the sensitizer with the addition of dineohexyl bis-(3,3-dimethyl-butyl)-phosphinic acid
(DINHOP) as a co-adsorbent (4: 1 ratio) in a solvent mixture of 10% DMSO and tert-butanol and acetonitrile (1 :1) v/v ratio. The above-described double-layered Ti02 films were sintererd for 30 min at 500° C and immersed in the dye solution for 16 h. After sensitization they were rinsed in pure MeCN and assembled with platinized counter electrodes. The counter electrodes were prepared using conducting glass TEC 15 (purchased from NSG, resistance 15Ω/αη2, 2 mm thick) on which the drop of a solution of hexachloroplatinate acid in n- propanol was cast. Thermal platinization occured during heating the electrodes twice for 15 min at 425 °C in air. Electrodes were then sealed with a 25 micrometer thick hot-melt film (Surlyn®, Dupont) by heating the system at 100°C.
The composition of the electrolyte B which was used:
electrolyte A = DMII/EMII/compound(TEST) /I2/NBB/GNCS (12/12/16/1.67/3.33/0.67) electrolyte B = electrolyte A + sulfolane (50:50 v/v).
Devices were completed by filling the space between the electrodes with electrolyte through pre-drilled holes in the counter electrodes and the holes were sealed with a Surlyn sheet and a thin glass cover by heating. Finally, metal contacts were placed on both electrodes. Photovoltaic measurements: Photovoltaic measurements were performed under simulated sun irradiance (100 mW cm"1, equivalent of 1 sun at air mass global, AM 1.5G, at the surface of the device) provided by a 450 W Xenon light source (Oriel, USA). A Schott Kl 13 Tempax sunlight filter (Prazisions Glas & Optik GmbH, Germany) was used to correct the spectral output of the lamp in the region 350 to 750 nm. Current to voltage characteristics (in the dark and under illumination) were obtained by applying a forward potential bias and measuring resulting current with a Keithley 2400 digital sourcemeter (Keithley, USA). A metal mask was used to precisely define the irradiated surface area (0.159 cm2). Quantum efficiencies of the cells were measured by using a SR830 lockin amplifier, however the incident light (300 W xenon lamp, ILC Technology) was focused through a Gemini- 180 double monochromator (Jobin-Yvon Ltd.). The cells were measured with an external light bias (10% Sun) provided by LED array. A black metal mask defined the cell active area to be 0.159 cm2.
Results
The photovoltaic parameters of devices containing electrolyte B @ 60 °C using Pt as a counter electrode are shown in the tables 1 to 3 at 0.1 sunlight and in table 4 at 1 sunlight. The tables show the photovoltaic parameters of CI 06 dye based devices measured under irradiation of 10 mW cm-2 AM 1.5G Sunlight.
The higher the efficiency the better.
Table 1 : results of COMP-W0131-Ex2
Table 2: results of compound of formula (5)
Table 3: results of compound of formula (7)
Jsc short circuit photo current
Voc open circuit voltage
FF fill factor
η efficiency
nd not determined
Figure imgf000029_0001
Figure imgf000030_0001
Figure imgf000030_0002
Table 4 shows better fill factors of compound of formula (7) compared to COMP-W0131- Ex2 in a suntest at 60°C with 100% sun.
Table 4 COMP-W0131-Ex2 compound of formula (7)
Time FF FF
[h] [%] [%]
0 69 69
117 67 71
283 56 69

Claims

1. A compound of formula (I);
Figure imgf000031_0001
wherein
R101 is Ci_6 alkyl;
R102 is a linear or branched Ci
Cat is a cation, which is selected from the group consisting of inorganic cation CatINORGn+ and organic cation CatORGn+;
n is 1 or 2;
m is 1, 2, 3 or 4.
2. Compound of formula (I) according to claim 1, wherein
R101 is Ci_2 alkyl;
m is 1, 2 or 3;
R102 is a linear or branched C2_i2 alkylene.
3. Compound of formula (I) according to claim 1 or 2, wherein
CatlNORG is selected from the group consisting of Li , Na , K , Rb , Cs , NH4 , Ag
Be2+, Mg2+, Ca2+, Sr2+ and Ba2+.
4. Compound of formula (I) according to claim 1 to 2, wherein
CatORGn+ contains a heteroatom selected from the group consisting of nitrogen, phosphorus, sulfur and oxygen.
5. Compound of formula (I) according to one or more of claims 1, 2 and 4, wherein, when n is 2, then CatORGn+ is (H3N-CH2-CH2-NH3)2+.
6. Compound of formula (I) according to one or more of claims 1 , 2 and 4, wherein, when n is 1 , then CatORG+ is selected from the group consisting of cation CatORG-A+, CatORG-B+, CatORG-C+, CatOrg-D+ and CatORG-E+;
CatOrg-A+ is (WR2R3R4R5)+,
wherein
W is a nitrogen or phosphorus;
(i) R2, R3, R4 and R5 are identical or different and independently from each other selected from the group consisting of H, Ci_2o alkyl, Ci_2o perfluoroalkyl, C3_io cycloalkyl and C6-io aryl, with the proviso, that at least one of the residues R2, R3, R4 and R5 is not H; or
(ii) R2 and R3 together with W form a 5- to 7-membered saturated or unsaturated ring, R4 and R5 are identical or different and independently from each other selected from the group consisting of H, Ci_2o alkyl, Ci_2o perfluoroalkyl, C3_io cycloalkyl and C6-io aryl; or
(iii) R2 and R3 together with W and R4 and R5 together with W form, independently from each other, a 5- to 7-membered saturated or unsaturated ring;
CatOrg-B+ is (XR6R7R8)+,
wherein
X is nitrogen,
R6 and R7 together with X form a 5- to 7-membered unsaturated ring in which X formally has one single bond and one double bond to R6 and R7 respectively,
R8 is selected from the group consisting of Ci_2o alkyl, Ci_2o perfluoroalkyl, C3_io cycloalkyl or C6-io aryl;
CatOrg-C+ is (YR9R10R1 1)+,
wherein
Y is sulphur;
(i) R9, RIO and Rl 1 are identical or different and independently from each other selected from the group consisting of Ci_2o alkyl, Ci_2o perfluoroalkyl, C3_io cycloalkyl and C6-io aryl; or (ii) R9 and RIO together with Y form a 5- to 7-membered saturated or unsaturated ring, Rl 1 is selected from the group consisting of Ci_2o alkyl, Ci_2o perfluoroalkyl,
C3-10 cycloalkyl and C6-io aryl; CatOrg-D+ is (ZR12R13)+,
wherein
Z is oxygen or sulphur;
R12 and R13 together with Z form a 5- to 7-membered ring in which Z formally has one single bond and one double bond to R12 and R13 respectively;
CatORG-E+ is a cyclic C3_9 alkane or a cyclic C3_9 alkene bearing a positive charge;
in case of a cyclic C3_9 alkene, CatORG-E+ has 1, 2 or 3 double bonds; the residues R2, R3, R4, R5, R6, R7, R8, R9, RIO, Rl 1, R12 and R13 are, independently from each other, unsubstituted or, where applicable, substituted by 1 , 2 or 3 substituents selected from the group consisting of halogen, cyano and Ci_4 alkoxy; rings formed by R2 and R3 together with W, R4 and R5 together with W, R6 and R7 together with X, R9 and RIO together with Y and R12 and R13 together with Z contain no, 1 or 2 further heteroatoms, the heteroatoms being selected from the group consisting of O, N and S; and wherein any further heteroatom N can be substituted by Ci_s alkyl or Ci_2o perfluoroalkyl.
7. Compound of formula (I) according to one or more of claims 1, 2 and 4, wherein, CatORGn+ is selected from the group consisting of ammonium, phosphonium, sulfonium, pyrrolidinium, pyrrolinium, pyrrolium, pyrazolium, pyrazolinium, imidazolium,
imidazolinium, triazolium, oxazolium, thiazolium, piperidinium, piperazinium,
morpholinium, pyridinium, pyridazinium, pyrimidinium, pyrazinium, 1,3-dioxolium, pyrylium and thiopyrylium, quinoxalinium, indolinium, indolium, cyclopropenylium, 1,2,3-triphenylcyclopropenylium, tri-tert-butylcyclopropenylium, 1,2,3- tris(diethylamino)cyclopropenylium, 1 ,2,3-tris(trimethylsilyl)cyclopropenylium and tropylium, l,2,3,4,5,6,7-heptaphenylcyclohepta-2,4,6-trien-l-ylium.
8. Compound of formula (I) according to one or more of claims 1, 2, 4 and 6, wherein CatORG is selected from the group consisting of
Figure imgf000034_0001
Figure imgf000034_0002
, [N(R20)(R21)(R22)R23] and [P(R20)(R21)(R22)R23] ; wherein
R20 is Ci_2o alkyl;
R21 , R22 and R23 are identical or different and independently selected from the group consisting of H and Ci_2o alkyl.
9. Compound of formula (I) according to claim 1 , wherein,
compound of formula (I) is selected from the group consisting of compound of formula (1), compound of formula (2), compound of formula (3), compound of formula (4), compound of formula (5), compound of formula (6) and compound of formula (7).
Figure imgf000034_0003
Figure imgf000034_0004
Figure imgf000035_0001
Figure imgf000035_0002
Figure imgf000035_0003
Figure imgf000035_0004
Figure imgf000035_0005
10. A method for the preparation of compound of formula (I) as defined in claim 1, the method comprises a step (Stl) or a step (St2); step (Stl) comprises a reaction (Real), wherein compound of formula (X) is reacted with trimethylsilylcyanide in the presence of cation Catn ;
Figure imgf000036_0001
step (St2) comprises a reaction (Rea2), wherein a compound of formula (I-Cat-r)
Figure imgf000036_0002
reacted with a compound of formula (I-Cat-n); n+
(Cat )(AnINORG4")t (I-Cat-n) q is 1 or 2;
r is 1 or 2;
when n and q are identical, then t is 1 ;
when n is 2 and q is 1 , then t is 2;
when n is 1 and q is 2, then t is 0.5;
AnINORGq" is an anion selected from the group consisting of halide, OH", CN~, OCN", SC , N3 ~, sulfate, hydrogensulfate, nitrate, C03 2", HC03 ", BF4 ", PF6 ", SbF6 ", CF3S03
(CF3S02)2N , (FS02)2N , Ci_6 alkylsulfonate, Ci_6 alkylsulfate, dioctylsulfosuccinate, anions of Ci_2o monocarboxylic aliphatic acids, anions of C2-6 dicarboxylic aliphatic acids, benzoate, phthalates, N(CN)2 ", C(CN)3 ", B(CN)4 ", P(CN)6 ", Sb(CN)6 ", and mixtures thereof;
Cat-rr+ has the same definition as Catn and is different from Catn ; Catn , n, m, R101 and R102 are as defined in claim 1.
11. Method according to claim 10, wherein
AnINORGq is an anion selected from the group consisting of halide, OH", CN~, sulfate, hydrogensulfate, nitrate, C03 2", HC03 ", BF4 ", PF6 ", CF3S03 ", (CF3S02)2N~, (FS02)2N~, methyl sulfonate, ethyl sulfonate, methyl sulfate, ethyl sulfate, acetate, oleate, fumarate, maleate, oxalate, benzoate, N(CN)2 , and mixtures thereof.
12. Method according to claim 10 or 11, wherein
compound of formula (X) is prepared in a step (StO);
step (StO) is done before step (Stl);
step (StO) comprises a reaction (ReaO), wherein boric acid is reacted with a compound of formula (X-0);
Figure imgf000037_0001
wherein
m, R101 and R102 are as defined in claim 10.
13. Use of compound of formula (I) as defined in claim 1 as solvent, as phase-transfer catalyst, as extractant, as heat-transfer medium, as surface-active substance, as plasticizer, as conductive salt, organic salt or additive in electrochemical cells, as electrolyte; as lubricant and as hydraulic fluid, as component in electrolyte formulations.
14. Use according to claim 13 of compound of formula (I) as component in electrolyte formulations, wherein
such electrolyte formulations comprising a compound of formula (I) are used in batteries, in capacitors, in supercapacitors or in electrochemical cells.
15. Use according to claim 13 of compound of formula (I) as component in electrolyte formulations, wherein
such electrolyte formulations comprising a compound of formula (I) are used in
electrochemical and/or optoelectronic devices.
16. Use according to claim 15 of compound of formula (I), wherein the electrochemical and/or optoelectronic devices are selected from the group consisting of photovoltaic cell, light emitting device, electrochromic or photo-electrochromic device, electrochemical sensor and/or biosensor, and dye sensitized solar cell.
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Citations (2)

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WO2010086131A1 (en) * 2009-02-02 2010-08-05 Lonza Ltd Novel tricyanoborates
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