Synthesis and crystal structures of metal complexes with 4,5-imidazole-dicarboxylate chelates: self-assembled structures via NH⋯O [dbnd]C intermolecular hydrogen bonds

Abstract

New metal complexes with two imidazole-carboxylate sets, [Zn(hmia) 2(H 2O) 2] (hmia = 1-hydroxymethyl-4-imidazoleacetate) ( 1) and [M(Himdc) 2(H 2O) 2] (imdc = 4,5-imidazoledicarboxylate) (M = Zn ( 2), Co ( 3), Cu ( 4)), were synthesized and structurally characterized. For all metal complexes, coordination of the two N–O sets of chelating ligands and two water molecules produces a distorted ( 1– 3) and an elongated ( 4) octahedral coordination center, in which these monomeric units are connected by various intermolecular hydrogen bonds.