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Applied Magnetic Resonance

, Volume 16, Issue 4, pp 499–506 | Cite as

ESR study of some Cu(II)-oxazepam complexes

  • E. Forizs
  • L. David
  • O. Cozar
  • V. Chiş
  • C. Craciun
  • R. Tetean
  • M. Todica
Article

Abstract

The CuL2X2 (L = 7-chlor-l,3-dihydro-3-hydroxi-5-phenyl-2H-l,4-benzodiazepin-2-one, also known as oxazepam, X = Cl, Br) complexes were prepared and investigated by ESR (electron spin resonance) method. Powder ESR spectra of CuL2X2 compounds at room temperature show the presence of monomeric species having an axial symmetry with a small rhombic distortion. In case of compounds with Cl there is a superposition of two nonequivalent mononuclear species, one with a\(d_{x^2 - y^2 } \) ground state and another with a\(d_{z^2 } \) ground state. In pyridine (Py) and dimethylformamide (DMF) solutions the monomeric species prevail. Two different monomeric species, one with pseudotetrahedral (Td) and the other with elongated tetrahedral-octahedral symmetry, were evidenced in DMF solutions adsorbed on NaY zeolite. In Py-DMF solutions two monomeric species were also identified. Dimeric species appear in DMF and Py solutions adsorbed on NaY zeolite through the coordination of two Cu(II) ions at the same keto-oxygen from one oxazepam molecule.

Keywords

Electron Spin Resonance Oxazepam Thick Solid Line Thin Solid Line Monomeric Species 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 1999

Authors and Affiliations

  • E. Forizs
    • 1
  • L. David
    • 2
  • O. Cozar
    • 2
  • V. Chiş
    • 2
  • C. Craciun
    • 2
  • R. Tetean
    • 2
  • M. Todica
    • 2
  1. 1.Department of Chemistry“Babes-Bolyai” UniversityCluj-NapocaRomania
  2. 2.Department of Physics“Babes-Bolyai” UniversityCluj-NapocaRomania

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