Electron spin resonance and magnetic studies on some copper(II) azobarbituric and azothiobarbituric acid complexes

  • Masoud M
  • Khalil E
  • Hafez A
 et al. 
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Abstract

Electron spin resonance and magnetic susceptibility on some copper(II) complexes prepared from phenylazobarbituric and phenylazothiobarbituric acid compounds containing 2,5-dichloro and 2,5-dimethyl groups were discussed. The thio complexes exist in dimer-monomer mixture. The corresponding copper(II) complexes of the oxygen homologous failed to exhibit association. Singlet-triplet separation values equal to -321 and -263 cm(-1) for the 2,5-dimethyl and 2,5-dichloro complexes, respectively, of the thio series. An empirical measure of the amount of tetrahedral deformation based on the values of g||/A|| assigned the square-planar geometry of the dimethyl-oxygen complex while the other complexes are with tetrahedral planar geometries. The effect of temperature on the ESR data was discussed. The diamagnetic properties of the complexes derived from 2,5-dichloro and 2,5-dimethyl thiobarbituric acid suggested the formation of Cu(I) complexes.

Author-supplied keywords

  • Copper/*chemistry
  • Data Interpretation, Statistical
  • Electron Spin Resonance Spectroscopy
  • Magnetics
  • Thiobarbiturates/*chemistry

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Authors

  • M S Masoud

  • E A Khalil

  • A M Hafez

  • A F El-Husseiny

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