Hydrophobic liquid salts, the preparation thereof and their appliction in electrochemistry
AssigneeAsulab S.A.
InventorsPierre Bonhote, Ana-Paula Dias
Life of this patent
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Abstract
Hydrophobic liquid salts of the general formula ##STR1## in which R.sub.1 and R.sub.3 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 R.sub.2, R.sub.4, and R.sub.5 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.
Claims9
Hydrophobic liquid salts of the general formula ##STR4## in which R.sub.1 and R.sub.3 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 R.sub.2, R.sub.4, and R.sub.5 are the same or different and each represent a hydrogen atom or an alkyl radical with 1 to 3 carbon atoms.
A process for the preparation of a hydrophobic liquid salt of the general formula ##STR5## in which R.sub.1 and R.sub.3 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 R.sub.2, R.sub.4 and R.sub.5 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 R.sub.1, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 is caused to react in aqueous medium with an alkali metal-bis-triflylamide, and in that the product obtained is separated by decantation.
An electrolytic composition containing as an aprotic polar solvent a hydrophobic liquid salt of the general formula ##STR6## in which R.sub.1 represents an alkyl radical having 1 to 5 carbon atoms, R.sub.3 represents a straight or branched alkyl radical, a fluoroalkyl radical, or an alkoxyalkyl radical having 1 to 8 carbon atoms;
- and R.sub.2, R.sub.4, and R.sub.5 each represent a hydrogen atom or an alkyl radical having 1 to 3 carbon atoms.
Dependencies are inferred from the claim text.