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    STUDIA PHYSICA - Ediţia nr.2 din 2004  
         
  Articol:   EPR AND HF-EPR OF METALLIC CLUSTERS INCORPORATED IN SOME SUPRAMOLECULAR SYSTEMS.

Autori:  O. COZAR, L. DAVID, M. RUSU, VASILE CHIŞ. 		 
       
         
  Rezumat:  The obtained results about the electronic structure, metal-ligand interaction, local symmetry changes as solvent effects, molecular association processes and the appearance of some dimeric or polymeric species in some supramolecular systems are reported. EPR spectra of Cu(II)-complexes with antiimflammatory and cardiovascular drugs (indomethacin, ibuprofen, piroxicam, dihidrazinophtalazine) exhibit typical absorbtions of randomly oriented triplet state (S=1) species (dimers) with small rhombical distorted axial symmetry. Trinuclear metallic clusters encapsulated in some polyoxometalates (supramolecular blocks of metal oxide) with applications in medicine and catalysis were evidenced too. The local symmetry, type of the coupling between the spins of transition metal ions and active EPR states depend strongly on the nature of these ions. The spectrum of one Cu(II)-tetranuclear polyoxometalate cluster is explained considering a superposition of the spectra for the (S,S13,S24) type states: (1,1,0), (1,1,1) and (1,0,1).  
         
     
         
         
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