An EPR and optical absorption study of VO2+ ions in di-ammonium hydrogen citrate [(NH4)(2)C6H6O7] single crystals

Karabulut B., Tufan A.

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, cilt.69, sa.2, ss.642-646, 2008 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 69 Sayı: 2
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1016/j.saa.2007.05.015
  • Dergi Adı: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.642-646
  • Anahtar Kelimeler: EPR, VO2+, metal ions, optical absorption, di-ammoniurn hydrogen citrate, DAHC, VANADYL ION, ESR-SPECTRA, GLASSES, CU2+, ACID
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

Single crystal and powder EPR studies of VO2+ doped di-ammonium hydrogen citrate [(NH4)(2)C6H6O7] are carried out at room temperature. The angular variation of the EPR spectra show three different VO2+ complexes that are located in different chemical environment, and each environment contains two magnetically inequivalent VO2+ sites in distinct orientations occupying substitutional positions in the lattice. Crystalline field around the VO2+ 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. (c) 2007 Published by Elsevier B.V.