Synthesis and molecular structures of a novel tetranuclear silver(I) cluster [Ag2(Himdc)(PPh3)2]2 (H3imdc = imidazole-4,5-dicarboxylic acid) and a mononuclear silver(I) complex [Ag(H2imdc)(PPh3)2]

A novel tetranuclear silver(I) cluster, [Ag2(Himdc)(PPh3)2]21 (H3imdc = imidazole-4,5-dicarboxylic acid), was prepared by a reaction among the Ag-O bonding precursor [Ag(R-Hpyrrld)]2 (H2pyrrld = 2-pyrrolidone-5-carboxylic acid), PPh3 and H3imdc in an organic solvent. By a reaction using increased amounts of PPh3, the monomeric complex [Ag(H2imdc)(PPh3)2] 2, was also obtained.