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    STUDIA PHYSICA - Issue no. Sp.%20Issue / 2003  
         
  Article:   ESR STUDY OF SOME METAL-COMPLEXES WITH THEOPHYLLINE AND NUCLEOTIDES.

Authors:  O. COZAR, L. DAVID, VASILE CHIŞ. 		 
       
         
  Abstract:  The CuT2L2∙H2O complexes [T= Theophylline (1,3-dimethylxanthine), L=NH3, n-propylamine (npa)] where prepared and investigated by ESR spectroscopy. Powder ESR spectrum of CuT2(NH3)22H2O is axial (g|| = 2.255, g = 2.059). ESR spectrum of CuT2 (npa)22H2O is a superposition of one axial (g|| = 2.299, g = 2.064) and one isotropic component (g0 = 2.100). The axial spectra of the former complexes are due to a statistic Jahn-Teller effect (EJT = 2880 cm-1). ESR investigation of Cu(II) complexes with guanosine-5''-monophosphate (5''-GMP) and cytidine-5''-monophosphate (5''-CMP) shows the affinity of Cu(II) ion to interact with the base and the phosphate groups. The different modes of the coordination of the metallic ion at the nucleotide and the water molecules lead to octahedral species, distorted by dynamical Jahn-Teller effect (g0 = 2.106) for Cu(II)5''-CMP complex and rhombically distorted (g1 = 2.358, g2 = 2.126, g3 = 2.068) or tetragonally distorted (g''|| = 2.299, g'' = 2.126) for Cu(II)5''-GMP complex.  
         
     
         
         
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