{Glyoxal bis[(2S)-pyrrolidin-2-ylmethylimine]}metal tetrachlorometallate complexes. The detection of polynuclear complex formation in solution by circular dichroism

Abstract

The Cu^II, Ni^II, Pd^II, and Co^II complexes of the tetradentate chiral ligand, glyoxal bis[(2S)-pyrrolidin-2-ylmethylimine](gpmi) have been prepared. Circular dichroism spectra show strong peaks in the absorption range of the free [M′Cl₄]^2–(M′= Cu, Ni, or Co) ions which indicate the polynuclear structures achieved by chloro-bridging between M and M′(M = Cu, Ni, and Co) persist in solution at concentrations >3 mmol dm^–3.