Abstract
Single crystal and powder EPR studies of VO 2+ doped di-ammonium hydrogen citrate [(NH 4) 2C 6H 6O 7] are carried out at room temperature. The angular variation of the EPR spectra show three different VO 2+ complexes that are located in different chemical environment, and each environment contains two magnetically inequivalent VO 2+ sites in distinct orientations occupying substitutional positions in the lattice. Crystalline field around the VO 2+ ion is nearly axial. The optical absorption spectrum shows two bands centred at 16,949 and 12,345 cm −1. Spin Hamiltonian parameters and molecular orbital coefficients are calculated from the EPR and optical data, and results are discussed.
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More From: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
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