Synthesis of nickel(II), copper(II), zinc(II), and cadmium(II) complexes of 2-[(2-mercaptophenyl)iminomethyl] pyrrole and 2-[(2-mercaptoethyl)-iminomethyl]pyrrole by the electrochemical cleavage of a disulphide bond: the crystal structure of bis{2-[(pyrrol-2-yl)methyleneamino]thiophenolato-S,N}zinc(II)

Abstract

The electrochemical oxidation of anodic metal (nickel, copper, zinc, or cadmium) in acetonitrile solutions of the Schiff bases derived from 2-pyrrolecarbaldehyde and bis(2-aminophenyl)disulphide (H₂L₂) or cysteamine (H₂L₂′) gives compounds [ML], [ML′] or [Zn(HL)₂]. The crystal structure of bis{2-[(pyrrol-2-yl)methyleneamino]thiophenolato}zinc(II) is orthorhombic, space group Pbca with a= 13.764(3), b= 17.819(1), c= 16.593(2)Å, and Z= 8. The zinc atom has ZnS₂N₂ distorted tetrahedral stereochemistry and the pyrrolic nitrogen atoms are not co-ordinated.