Hydrophobic liq. salts of formula (I) are new: R1,R3 = 1-8C (un)branched alkyl, fluoroalkyl, or alkoxyalkyl; R2,R4,R5 = H or 1-3C alkyl. Also claimed is: (a) the prepn. of such salts; (b) an electrolytic compsn. contg. (I) as aprotic polar solvent; and (c) an electrochemical photovoltaic cell contg. the electrolytic compsn..