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EPR and Optical Absorption Studies of VO

2+

Doped Trisodium Citrate Dihydrate Single Crystals

B. Karabulut, ˙I. ˙Ilkin, and R. Tapramaz

Ondokuz Mayıs University, Faculty of Art and Sciences, Department of Physics, 55139 Samsun, Turkey

Reprint requests to Dr. B. K.; E-mail: bbulut@omu.edu.tr Z. Naturforsch. 60a, 95 – 100 (2005); received July 20, 2004

The electron paramagnetic resonance of VO2+ doped trisodium citrate dihydrate (Na3C6H5O7·2H2O) single crystals and powder has been examined at room temperature. The angular variation of the EPR spectra has shown that two different VO2+complexes are located in different chemical environments, each environment containing two magnetically inequivalent VO2+ sites in distinct orientations occupying substitutional positions in the lattice and showing a very large angular dependence. The crystalline field around the VO2+ion is nearly axial. The optical absorption spectrum shows three bands, centered at 24631, 16892, and 12195 cm1. The spin Hamiltonian parameters and the molecular orbital coefficients are calculated from the EPR and optical data, and result are discussed.

Key words: EPR; Trisodium Citrate; Absorption the Spectrum; Vanadyl Ion.

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