Structural diversity in the d10 metal complexes containing N,N′-di(3-pyridyl)oxamide

Abstract

A series of d10 metal complexes {[Cd(L)2(CH3OH)2](ClO4)2}∞ (L=N,N′-di(3-pyridyl)oxamide), 1, {[Zn(L)2(H2O)2](NO3)2·2H2O}∞, 2, [ZnCl2(L)·2DMF·C4H10O]∞, 3, [ZnX2(L)·2DMF]∞ (X=Br, 4 and I, 5), [HgCl2(L)]∞, 6, [HgBr2(L)·2DMF]∞, 7, and Hg2I4(L)2, 8 have been prepared by the reactions of M(II) salts (M=Zn, Cd and Hg) with L, which have been structurally characterized by X-ray crystallography. Complexes 1 and 2 form 1D looped chains with 22-membered metallocycles and complexes 3, 4, 6 and 7 show 1D zigzag chains, while complex 5 exhibits a 1D concavo-convex chain and complex 8 displays a dinuclear metallocycle. Two types of ligand conformations, syn and anti, are adopted by the L ligands in these complexes. In the Zn(II) complexes 3–5 and Hg(II) complexes 6–8, the chloride and bromide anions play similar role in the crystal structures, while the iodide anion is distinct.