Abstract: The invention relates to ionically conductive materials including at least one compound corresponding to the following formula (I): ##STR1## in which the groups X and X' are identical or different and denote at least one electrophilic group in an ortho, meta and/or para position and M denotes an alkali or alkaline-earth metal, in solution in a solvent including a macromolecular material or a polar aprotic solvent or solvent mixture. The electrophilic groups X, X' may be chosen from nitro, C.sub.1 -C.sub.5 perfluoroalkyl, CN, halogen, vinyl, CO.sub.2 R and SO.sub.2 R groups where R denotes a C.sub.1 -C.sub.5 linear or branched alkyl radical and the metal M may be chosen from lithium, sodium, potassium, caesium, magnesium, calcium and barium. The invention also relates to a process for the preparation of the abovementioned compounds.