A Spectroscopic Reexamination of a Series of Bis(β-diketonato)copper(II) Complexes

Abstract

ESR and optical absorption studies of a series of bis(α-substituted β-diketonato)copper(II) complexes (the substituent is the alkyl or trifluoromethyl group) in toluene or cyclohexane have been carried out systematically. ESR spectra have been analyzed by computer simulation. The coordination bondings as well as the energies and intensities of the metal ← ligand charge-transfer transitions of B3u and B2u← B1g in D2h and those of d-d transitions have been fully discussed, with special attention to the correlation of them with the pKa of the ligands and their mutual relationships have been explained satisfactorily in terms of covalency in the σ bonding. © 1978, American Chemical Society. All rights reserved.