Chemistry of mercaptopyridines and related ligands: Part I-Synthesis & spectroscopic studies of complexes of copper(I) with 2(1H)-pyridinethione-S and tertiaryphosphines

Abstract

Reaction of 2(1H)-pyridinethione-S(HpyS) with copper(II) chloride gives a copper(I); complex of stoichiometry, CuCl(HpyS) which on further reaction with triphenylphosphine (Ph₃P ) and bis(diphenylphosphino) alkanes, Ph₂P(CH₂)_nPPh₂ (n = 1-4) gives mixed ligand complexes, CuCl(HpyS)L_n (n = 2 for Ph₃P and 1 for other ligands). On the other hand, the reaction of copper(II) bromide with HpyS gives a copper(II) complex, CuBr₂(HpyS)₂ which on similar reactions with phosphine ligands gives the analogous copper(I) complexes, CuBr(HpyS)L_n. The X-ray crystal structure for CuCl(HpyS)(Ph₃P)₂ supports the formulated geometries for other complexes.