5. SOME ESR_ OPTICAL ABSORPTION AND BONDING PARAMETERS OF COPPER (II) COMPLEXEXS OF 1-(1-HYDROXY-2-NAPHTHYL)-3-(PHENYL OR SUBSTITUTED PHENYL)-PROP-2-EN-1-ONES By E.R. AGHARIA

Abstract

Some copper (II) complexes of naphthalene analogues of 2’-hydroxychalcones have been synthesized and characterized. The copper (II) complexes have the general formula CuL2, where, L is the deprotonated ligand, the naphthylchalcone. In the present investigation,some esr, optical absorption and bonding parameters of copper (II) complexes such as the Fermi Contact Interaction term (K), the Dipolar term (P),the Orbital Reduction parameter K2(?????2and ?????2),the Effective Spin-Orbit Coupling constant ?(???and??)and the approximate determination of 10Dq values are estimated from the experimental spin Hamiltonian parameters obtained from the ESR spectra of the Cu (II) complexes.These parameters are calculated by using different formulae involving different EPR parameters. In coordination chemistry, ESR or EPR or EMR plays a complementary role in elucidating the structure of coordination complexes, particularly Cu (II) complexes.The EPR studies of the copper complexes provide supportive evidence to the optical result.
KEY WORD: ESR, EPR, chalcones, coordination complexes, bonding, covalent, Fermi Contact term, Dipolar term, 10Dq, Spin-Orbit Coupling constant.