Synthesis and crystal structure characterization of iron(II), cobalt(II) and nickel(II) complexes with 1,3-bis(2-pyridylmethylthio)propane

• DOI: 10.1016/j.poly.2009.02.039
• Publication Date: 2009-03-12T08:23:44Z
• Authors: Animesh Patra; Sandipan Sarkar; Michael G.B. Drew; Ennio Zangrando; Pabitra Chattopad...
• Keywords: iron; cobalt; nickel 1; 3-bis(2-pyridylmethylthio)propane; 3-bis(2-pyridylmethylthio)propane; iron; nickel 1; cobalt; 01 natural sciences; 0104 chemical sciences

Abstract Three new mononuclear complexes of nitrogen–sulfur donor sets, formulated as [FeII(L)Cl2] (1), [CoII(L)Cl2] (2) and [NiII(L)Cl2] (3) where L = 1,3-bis(2-pyridylmethylthio)propane, were synthesized and isolated in their pure form. All the complexes were characterized by physicochemical and spectroscopic methods. The solid state structures of complexes 1 and 3 have been established by single crystal X-ray crystallography. The structural analysis evidences isomorphous crystals with the metal ion in a distorted octahedral geometry that comprises NSSN ligand donors with trans located pyridine rings and chlorides in cis positions. In dimethylformamide solution, the complexes were found to exhibit FeII/FeIII, CoII/CoIII and NiII/NiIII quasi-reversible redox couples in cyclic voltammograms with E1/2 values (versus Ag/AgCl at 298 K) of +0.295, +0.795 and +0.745 V for 1, 2 and 3, respectively.