Syntheses, structure and properties of chiral copper(II) complexes with end-on azide bridge and chiral-bipyridine ligand

Abstract

A novel one-dimensional chiral copper(II) complex with single end-on (EO) azide bridge and chiral 2,2-bipyridine ligand, [Cu(N 3) 2(L)] n ( 1), and a mononuclear chiral copper(II) complex, [Cu(N 3) 2(L)] ( 2) (L = (1R)-6,6-dimethyl-5,7-methano-2-(2-pyridinyl)-4,5,6,7-tetrahydroquinoline), have been synthesized and characterized. The crystal structure determination shows that complex 1 is a one-dimensional chiral coordination polymer with non-equivalent Cu–N(azide) bonds, in which the central Cu(II) ion is penta-coordinated in the form of a slightly distorted square-based pyramid. Compound 2 is a four-coordinated mononuclear complex where the Cu(II) ion has a highly distorted tetrahedronal environment. Both complexes 1 and 2 crystallize in the chiral space group: P2 12 12 1 and P 1, respectively. The magnetic studies show that there exists antiferromagnetic interaction between the copper(II) ions in complex 1.