Copper(I) complexes with schiff base and 1,2-bis(diphenylphosphino)ethane as ligands: synthesis, structure and catalytic properties for the amination of aryl halide

Abstract

Some copper(I) complexes of the type [Cu(L)(dppe)]X (1–4) [where L = (3-trifluoromethylphenyl)pyridine-2-ylmethylene-amine; dppe = 1,2-bis(diphenylphosphino)ethane; X = Cl^-, CN^-, ClO₄^- and BF₄^-] have been synthesized by the condensation of 3-aminobenzotrifluoride with 2-pyridinecarboxaldehyde followed by the reaction with CuCl, CuCN, [Cu(MeCN)₄]ClO₄ and [Cu(MeCN)₄]BF₄in presence of dppe. The complexes 1–4 were then characterized on the basis of elemental analysis, IR, UV–Vis and ¹H NMR spectral studies. The representative complex of the series 4 has been characterized by single crystal X-ray diffraction which reveal that in complex the central copper(I) ion assumes the irregular pseudo-tetrahedral geometry. The catalytic activity of the complexes was tested and it was found that all the complexes worked as effective catalyst in the amination of aryl halide.