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    STUDIA PHYSICA - Issue no. Sp.%20Issue / 2003  
         
  Article:   EPR STUDY OF TWO SANDWICH-TYPE HETEROPOLYOXOMETALATES WITH TRINUCLEAR VANADIUM CLUSTERS (VIV3 AND VIV2VV).

Authors:  L. DAVID, O. COZAR, VASILE CHIŞ. 		 
       
         
  Abstract:  The sandwich-type K12[(VO)3(BiW9O33)2]31H2O (1) and K11[(VO)3(BiW9O33)2]21H2O (2) heteropolyoxotungstates were investigated by means of EPR spectroscopy. The powder EPR spectrum of the complex 1 obtained at room temperature was simulated as a superposition of one axial component with gII = 1.899, g = 1.974, AII = 184 G and A = 69 G for the S = 1/2 ground state of the VIV3 cluster and a broad component ( 500 G) with giso = 1.974 for the excited S = 3/2 state and accounting for a combined effect of unresolved g and A anisotropies and VV dipolar coupling. The powder spectrum of the complex 2 presents the same features, but with the EPR parameters: gII = 1.908, g = 1.968, AII = 186 G, A = 60 G for the axial component and giso = 1.968, Biso = 500 G for the isotropic component.  
         
     
         
         
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