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    STUDIA CHEMIA - Issue no. 4 / 2007  
         
  Article:   SYNTHESIS AND CHARACTERIZATION OF A NEW BISMUTHO(III)POLYOXOMETALATE WITH MIXED ADDENDA.

Authors:  OANA BABAN, DAN RUSU, ADRIAN PATRUT, CORA CRĂCIUN, MARIANA RUSU. 		 
       
         
  Abstract:   A new bismutho(III)polyoxometalate cluster with mixed addenda, which corresponds to the formula K8[BiIII2W20VIV2O70(OH)2(H2O)4]•23H2O, was synthesized. The cluster was investigated by FT-IR, UV-Vis-NIR and EPR spectroscopy. The FT-IR spectrum exhibits vibrations, which indicates the presence of Bi heteroatoms and of W and V addenda. The UV spectrum contains charge-transfer bands, which are specific to the polyoxometalate building. The Vis-NIR spectrum shows two heteronuclear intervalence charge-transfer bands 608 and 806 nm, due to the presence of V4+ metal centers. The EPR spectrum indicates non-interacting V4+metal centers.  
         
     
         
         
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