EPR and optical absorption studies of VO2+ doped L-alanine (C3H7NO2) single crystals


Biyik R.

PHYSICA B-CONDENSED MATTER, vol.404, no.20, pp.3483-3486, 2009 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 404 Issue: 20
  • Publication Date: 2009
  • Doi Number: 10.1016/j.physb.2009.05.039
  • Journal Name: PHYSICA B-CONDENSED MATTER
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3483-3486
  • Keywords: L-Alanine, EPR, Absorption spectrum, Vanadyl ion, ELECTRON-PARAMAGNETIC-RES, BETA-CELL LINE, VANADYL ION, RESONANCE, COMPLEXES, SPECTRA, CU2+
  • Ondokuz Mayıs University Affiliated: Yes

Abstract

VO2+ doped L-alanine (C3H7NO2) single crystals and powders are examined by electron paramagnetic resonance (EPR) and optical absorption spectroscopy. Three magnetically different sites are resolved from angular variations Of L-alanine single crystal EPR spectra. In some specific orientations each VO2+ line splits into three superhyperfine lines with intensities of 1:2:1 and maximum splitting value of 2.23 mT. The local symmetries of VO2+ complex sites are nearly axial. The optical absorption spectra show three bands. Spin Hamiltonian parameters are measured and molecular orbital coefficients are calculated by correlating EPR and optical absorption data for the central vanadyl ion. (C) 2009 Elsevier B.V. All rights reserved.