Synthesis,structure,and redox properties of copper(I) complexes with phenylpyridin-2-ylmethyleneamine derivatives

Abstract

Four copper(I) complexes, [Cu(diimine)₂]ClO₄ (1 – 4, Diimine=(4-fluorophenyl)pyridin-2-ylmethylene-amine, (1) (4-chlorophenyl)pyridin-2-ylmethyleneamine, (2), (4-bromophenyl)pyridin-2-ylmethyleneamine, (3), and (4-iodophenyl)pyridin-2-ylmethyleneamine, (4)) have been synthesized and characterized by CHN analyses, ¹H NMR, IR, and UV – vis spectroscopy. The crystal structure of [Cu(B)₂]ClO₄ (2) was determined from single crystal X-ray diffraction. The coordination polyhedron about the copper(I) center in 2 is best described as a distorted tetrahedron. A quasi-reversible redox behavior is observed for the complexes. The spectral, structural, and redox data of these complexes are compared with similar iminopyridine copper(I) complexes. The variation of substituent on the phenyl ring of iminopyridine ligands did not show significant change in the absorption and redox properties of these types of complexes.