Syntheses, crystal structures, and properties of four new coordination compounds of transition metals and imidazoledicarboxylic acid derivatives

Abstract

Four new transition metal coordination complexes, [Cd(H2pimdc)2(H2O)2] · 4H2O (1), [Zn(H2pimdc)2(H2O)2]2 · 7H2O (2), and [M(H2pimdc)2] (M = Cu (3) or Ni (4), H2pimdc− = 2-propyl-4,5-imidazoledicarboxylate), have been prepared by conventional synthesis and characterized by elemental analyses, IR, TG, and single-crystal X-ray diffraction. H2pimdc− is a bidentate chelating ligand in 1 and 2, leading to 3-D supramolecular structures through hydrogen bonds. However, H2pimdc− is a tridentate chelating-bridge ligand in 3 and 4, which exhibit 2-D layer structures. Thermal properties and photoluminescence spectra of 1–4 were measured.