Four transition metal complexes constructed with mixed mercaptotetrazole and 4,4′-bipyridine ligands

Abstract

Based on 5-mercapto-1H-tetrazole-1-methanesulfonic acid disodium salt (Na2mtms) and 4,4′-bipyridine (bpy) as ligands, four new transition metal complexes, namely {[Cd2(mtms)(bpy) 2(OAc)2]·H2O} n (1), {[Cd(mtms)(bpy)2(H2O)2] 2·bpy·4H2O} n (2), {[Zn 2(μ 2-OH)(mtms)(bpy)3(H2O)] ·ClO4·H2O} n (3), and {[Co(mtms)2(bpy)(H2O)2]·[Co(bpy) 2(H2O)4]·H2O} n (4), have been synthesized and characterized by single-crystal X-ray diffraction. Complex 1 features a pillared-layer coordination architecture linked by acetate, mtms, and bridging bpy ligands. Complex 2 has a 1D polymeric structure with [Cd(mtms)(bpy)2(H2O)2] as the repeating unit; these infinite chains are further connected into a 3D supramolecular framework through π-π stacking of bpy ligands. In complex 3, the mtms ligand combined with μ 2-OH bridges two Zn atoms to form a dimer structure, which is different from that of complex 2. Complex 4 shows a 3D supramolecular network containing infinite [Co(mtms) 2(bpy)(H2O)2]2- anionic chains and free [Co(bpy)2(H2O)4]2+ cationic components. The luminescence properties of 1 and 2 and the electrochemical properties of 3 are reported. © 2013 The Author(s).