Single-crystal electronic and electron spin resonance spectra of dichloroaquo-(2,9-dimethyl-1,10-phenanthroline)copper(II)

Abstract

The polarised single-crystal electronic spectra and e.s.r. spectra of dichloroaquo-(2,9-dimethyl-1,10-phenanthroline)copper(II), [Cu(dmp)Cl₂(H₂O], are reported and are interpreted in C_2v effective symmetry. A comparison of the crystal structure with that of [Cu(dien)(HCO₂)]HCO₂(dien = diethylenetriamine) and a study of the electronic properties provide reasons for preferring a distorted square-pyramidal description of the stereochemistry of [Cu(dmp)Cl₂(H₂O)] rather than a distorted trigonal-bipyramidal description.