Copper(II), zinc(II) and nickel(II) coordination polymers using bidentate hyroxyphenyl-tetrazolyl ligand

Abstract

Herein, we report various metal complexes containing {5-(2-hydroxy)phenyl}tetrazolyl (H(2)hptz) which form various high-dimensional coordination polymers in a crystalline solid state. A reaction of metal per chlorates, 2,2'-bipyrimidine (bpym), KOH, and tetrazolyl ligand (H(2)hptz) in H2O or N,N-dimethylmethanamide (DMF) yield 2-D [Cu(hptz)(bpym)](n) (1), [Zn(hptz)(bpym)](n) (2) and 3-D [K(bpym)(2)Ni(hptz) (H2O)(2.5)(OH)](n) (3) coordination complexes with a high synthetic yield. These compounds were characterized by elemental analysis, IR spectroscopy, and single crystal X-ray crystallography. Cu2+ and Zn2+ complexes showed 2-D infinite network systems, forming coordination polymers (caused by extra bonding between metal ions and tetrazolyl). The environment of the Cu and Zn metal centers are quite similar; however, Zn2+ complexes have significantly shorter Zn-O bond distances with the hydroxyl group of other [Zn(hptz)(bpym)] unit. The Ni2+ complex 3 showed a completely different composition from that of complexes 1-2. Complex 3 showed 3-D structure based on octahedral units, which were composed of two hptz(2-) and one bpym ligands around the Ni center. These units infinitely repeat with K ions and water molecules along the a-, b-, and c-axes of the unit cells. Their magnetic behaviors were also studied. (C) 2016 Elsevier Ltd. All rights reserved