Hybrid NS ligands supported Cu(i)/(ii) complexes for azide-alkyne cycloaddition reactions

Abstract

Three copper complexes of nitrogen-sulfur donor ligands, [CuBr 2(L1)] (1), [CuCl2(L2)2] (2) and [Cu 2I2(L3)]n (3) (L1 = bis(2- cyclohexylsulfanylethyl)amine, L2 = 2-(benzylsulfanylmethyl)pyridine and L3 = 2-(4-pyridylsulfanylmethyl)pyridine), have been synthesized and characterized by single-crystal X-ray diffraction (XRD), powder XRD and TGA analysis. Complexes 1 and 2 are mononuclear Cu(ii) complexes and are EPR active with distorted square-pyramidal and octahedral geometry, respectively. Complex 3 is a two-dimensional tetrahedral Cu(i) coordination polymer with 16- and 20-membered metallocycles. These complexes show good catalytic activities for one-pot azide-alkyne cycloaddition reactions in CH3OH-H2O. © 2013 The Royal Society of Chemistry.