Electron Paramagnetic Resonance of VO2+ in Cd(HCOO)2·2H2O and Pb(HCOO)2 Single Crystals

Abstract

The EPR spectra of VO2+ in Cd(HCOO)<inf>2</inf>IH<inf>2</inf>O and Pb(HCOO)<inf>2</inf> single crystals and powders were studied at room temperature. The angular variations of the spectra indicated that the VO2+ enters Cd2+ and Pb2+ sites in their respective host crystals. Two magnetically inequivalent sites in Cd(HCOO)<inf>2</inf>2H<inf>2</inf>O and Pb(HCOO)<inf>2</inf> for VO2+ were observed. The principal values of the spin-Hamiltonian parameters g and A were determined from the single crystal and powder EPR spectra. Using the EPR parameters and diffuse reflectance data molecular orbital bonding coefficients and crystal field parameters of VO2+ have been evaluated and discussed. © 1998 Elsevier Science Ltd.