Correlation Within Paramagnetic Shifts of 1h Nmr of 3-Imidazolidine Nitroxyl free Radical Transition Metal Complexes

E. M. R. Kiremire, G. Kumar, K. Chibale, J. C. A. Boeyens, J. Makhubela and E. Matabane

University of Namibia, Private Bag 13301 Windhoek (Namibia) Department of Chemistry, University of Capetown, Rondebosch 7701 (South Africa)

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ABSTRACT:

The ¹HNMR paramagnetic shifts of NiL2 phen, Nil2 Im2 and ML2 complexes where M = Co(II), Ni(II), Cu(II) and Zn(II) and L is the deprotonated imidazolidine nitroxyl free radical ligand have been obtained and analysed. The paramagnetic shifts of the phenyl proton were found to increase in the order Zn(II) < Cu(II) < Ni(II) < Co(II) in congruence with increase in the magnetic moment of the metal ion.

KEYWORDS:

Paramagnetic shifts; free radical; transition metal complexes