EPR spectra of Cu2+ and VO2+ ions in ammonium hydrogen oxalate hemihydrate [(NH4)HC2O4 center dot 1/2H(2)O single crystals

Karabulut B., Tufan A.

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, vol.65, no.2, pp.285-291, 2006 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 65 Issue: 2
  • Publication Date: 2006
  • Doi Number: 10.1016/j.saa.2005.10.044
  • Journal Name: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.285-291
  • Keywords: EPR, ammonium hydrogen oxalate hemihydrate, [(NH4)HC2O4 center dot 1/2H(2)O], VO2+, Cu2+ ground state wave function, ELECTRON-PARAMAGNETIC-RESONANCE, OPTICAL-ABSORPTION, SPIN-RESONANCE, VANADYL ION, SUPERHYPERFINE INTERACTION, ESR, CU-2+, COMPLEXES
  • Ondokuz Mayıs University Affiliated: No

Abstract

Cu2+ and VO2+ doped ammonium hydrogen oxalate hemihydrate, [(NH4)HC2O4 center dot(1)/2H2O], single crystals have been studied at room temperature and at 113 K in three mutually perpendicular planes. Both ions yield unexpectedly large number of lines. The calculated results of the Cu2+ and VO2+ doped in [(NH4)HC2O4 center dot(1)/2H2O] indicate that both ions substitute with the NH4+ ion in the structure. The EPR spectra of Cu2+ ions are characteristic of tetragonally elongated octahedral site and the spectra of VO2+ are characteristic of tetragonally compressed complex. The angular variation of the EPR spectra has shown that two different Cu2+ and VO2+ complexes are located in different chemical environments, and each environment contains two magnetically inequivalent Cu2+ and VO2+ sites in distinct orientations occupying substitutional positions in the lattice and show very high angular dependence. The principal g and the hyperfine (A) values of both ions are determined. (c) 2005 Elsevier B.V. All rights reserved.