the invention relates to a process for synthesizing an ionic metal complex represented by the general formula or . this process includes reacting in an organic solvent a compound represented by the general formula or with a halogen - containing compound represented by the general formula or , in the presence of a reaction aid containing an element selected from the group consisting of elements of groups 1 - 4 and 11 - 14 of the periodic table . it is possible by this process to easily and efficiently synthesize the ionic metal complex , which can be used as a supporting electrolyte for electrochemical devices , a polymerization catalyst of polyolefins and so forth , or a catalyst for organic synthesis .