Complexes of some first-row transition elements with (–)-spartein

Abstract

Complexes of cobalt(II), nickel(II), copper(II), and zinc(II), of the general formula [M(spartein)X2], where X = Cl–, Br– or I–, have been prepared and characterised. Magnetic moments, electronic spectra, and the circular dichroism absorption (down to 5000 cm–1) of [Ni(sp)Cl2] are reported. The electronic structures of the cobalt(II) and nickel(II) complexes are discussed in terms of an effective C2v chromophoric symmetry. Complexes of manganese(III) and iron(III) have been obtained, but are less well characterised.