Hydrophobic liquid salts, the preparation thereof and their appliction in electrochemistry
First Claim
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1. Hydrophobic liquid salts of the general formula ##STR4## in which R1 and R3 are the same or different and each represent a straight or branched alkyl radical, a fluoroalkyl radical, or an alkoxyalkyl radical of 1 to 8 carbon atoms;
- and R2, R4, and R5 are the same or different and each represent a hydrogen atom or an alkyl radical with 1 to 3 carbon atoms.
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Abstract
Hydrophobic liquid salts of the general formula ##STR1## in which R1 and R3 are the same or different and each represent a straight or branched chain alkyl radical, a fluoroalkyl radical or an alkoxyalkyl radical of 1 to 8 carbon atoms; and R2, R4, and R5 are the same or different and each represent a hydrogen atom or an alkyl radical with 1 to 3 carbon atoms.
The invention has applications as an electrolyte solvent in electrochemical photovoltaic cells.
114 Citations
9 Claims
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1. Hydrophobic liquid salts of the general formula ##STR4## in which R1 and R3 are the same or different and each represent a straight or branched alkyl radical, a fluoroalkyl radical, or an alkoxyalkyl radical of 1 to 8 carbon atoms;
- and R2, R4, and R5 are the same or different and each represent a hydrogen atom or an alkyl radical with 1 to 3 carbon atoms.
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2. Hydrophobic liquid salts according to claim 1, characterised in that R1 or R3 represent a methyl, ethyl, butyl, isobutyl, octyl, methoxyethyl, or 2,2,2-trifluoroethyl radical and R2, R4, and R5 represent hydrogen or a methyl or ethyl radical.
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3. A hydrophobic liquid salt according to claim 1, characterised in that it corresponds to methyl-1-butyl-3-imidazolium-bis-triflylamide.
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4. A hydrophobic liquid salt according to claim 1, characterised in that it corresponds to methyl-1-ethyl-3-imidazolium-bis-triflylamide.
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5. A hydrophobic liquid salt according to claim 1, characterised in that it corresponds to ethyl-1-butyl-3-imidazolium-bis-triflylamide.
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6. A process for the preparation of a hydrophobic liquid salt of the general formula ##STR5## in which R1 and R3 are the same or different and each represent a straight or branched alkyl radical a fluoroalkyl radical, or an alkoxyallcyl radical of 1 to 8 carbon atoms;
- and R2, R4 and R5 are the same or different and each represent a hydrogen atom or an alkyl radical with 1 to 3 carbon atoms;
said process being characterized in that an imidazolium halide substituted by R1, R2, R3, R4, and R5 is caused to react in aqueous medium with an alkali metal-bis-triflylamide, and in that the product obtained is separated by decantation.
- and R2, R4 and R5 are the same or different and each represent a hydrogen atom or an alkyl radical with 1 to 3 carbon atoms;
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7. A process of preparation according to claim 6, characterised in that the halide is a bromide or an iodide and the alkali metal is lithium.
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8. An electrolytic composition containing as an aprotic polar solvent a hydrophobic liquid salt of the general formula ##STR6## in which R1 represents an alkyl radical having 1 to 5 carbon atoms, R3 represents a straight or branched alkyl radical, a fluoroalkyl radical, or an alkoxyalkyl radical having 1 to 8 carbon atoms;
- and R2, R4, and R5 each represent a hydrogen atom or an alkyl radical having 1 to 3 carbon atoms.
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9. An electrochemical photovoltaic cell comprising an electrolytic composition according to claim 8 containing the iodo/tri-iodide redox couple.
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