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 C_2v chromophoric symmetry. Complexes of manganese(III) and iron(III) have been obtained, but are less well characterised.