Synthesis, Crystal Structures and Catalytic Oxidation Property of Copper(II) Complexes Derived from 5-Bromo-2-((2-diethylaminoethylimino)methyl)Phenol

Abstract

Two new copper(II) complexes, [CuBrL] (1) and [CuL(CH₃COO)] (2), where L is the deprotonated form of the Schiff base 5-bromo-2-((2-diethylaminoethylimino)methyl)phenol (HL), are prepared. The Schiff base and complexes are characterized by IR and UV spectra. In addition, the free Schiff base is characterized by ¹H NMR spectrum. Structures of the complexes are further confirmed by single crystal X-ray determination. The Cu atoms in the complexes are in square planar coordination. The Schiff base ligand coordinates to the Cu atoms through phenolate oxygen, imino nitrogen and amino nitrogen. The bromide and acetate anions in the complexes furnish the square planar coordination. Catalytic property for epoxidation of styrene by the complexes is studied.