An EPR study of VO2+ ions in arsanilic acid [C6H4AsNO (H2O)2] single crystals

EPR spectra of VO2+ ions doped [C6H4AsNO (H2O)2] and powder have been studied at room temperatures. The detailed EPR analysis have shown that two different VO2+ complexes are located in different chemical environments, and each environment contains two magnetically inequvalent VO2+ sites in distinct orientations occupying interstitial positions in the lattice and show very high angular dependence. The EPR spectra of VO2+ are characteristic of tetragonally compressed complex. The spin Hamiltonian parameters obtained from single crystal data for two VO2+ complexes. These are found to be axially symmetric. The EPR spin-Hamiltonien parameters have been used to evaluate the bonding coefficients of the vanadyl ion in the arsanilic acid lattice.