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    STUDIA PHYSICA - Issue no. 1 / 2001  
         
  Article:   RAMAN AND SERS STUDIES ON COBALT(II) CUPFERRONATO COMPLEXES.

Authors:  M. BOLBOACA, SIMONA CINTĂ PÂNZARU, O. COZAR, T. ILIESCU, P. RÖSCH, WOLFGANG KIEFER.
 
       
         
  Abstract:  Raman and surface-enhanced Raman scattering (SERS) spectra of cupferron, [PhN2O2]NH4 and the new corresponding cobalt(II) cupferronato complexes, CoL2A2, L = PhN2O2-, A = MeOH, o-C6H4(NH2)2, p-C6H4(NH2)2 were recorded and discussed. All the complexes show a Raman band at about 1302 cm-1 and the characteristic (N-N) and (ONNO) modes of the anionic ligand. The vibrational analysis of the title compounds reveals the electron delocalisation over the N-nitroso-N-hydroxylaminato (ONNO) unit as well as the bidentate coordination of the cupferronato ligand to the metal center through the oxygen atoms. These complexes were found to adsorb on different Ag SERS substrates. SERS spectra of the title compounds bring additional arguments for the bidentate coordination of the ONNO group.  
         
     
         
         
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