Direct electrochemical synthesis of tin(IV) complexes of 2-(2-mercaptoethyl)iminomethyl-phenols; the molecular structure of bis{2-(2-mercaptoethyl)iminomethyl-5-bromo-phenoxy}tin(IV)

Abstract

Anodic oxidation of tin in acetonitrile solutions of Schiff bases (H 2L 2) derived from the required salicylaldehyde and bis(2- aminoethyl)disulfide yielded compounds with general formula SnL 2. The crystal structure of bis{2-(2-mercaptoethyl)iminomethyl-5-bromo-phenoxy}tin(IV) has been determined: orthorhombic, space group Pbcn with a=11.023(1), b=8.376(1), c=22.184(2) Å and Z=4. The structure was determined by direct methods and refined to R=0.063 and R w=0.070. The ion atom is coordinated to the sulfur, nitrogen and oxygen atoms of two dianionic tridentate ligands and the coordination polyhedron around the metallic atom can be described as slightly distorted octahedral. Vibrational, 1H, 13C, 119Sn NMR and Mössbauer spectroscopic data are presented for the synthesized compounds.