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    STUDIA CHEMIA - Issue no. 2 / 2006  
         
  Article:   SPECTROSCOPIC AND MAGNETIC INVESTIGATIONS OF THE CHROMIUM(III) TUNGSTOARSENATE.

Authors:  DAN RUSU. 		 
       
         
  Abstract:  The sandwich-type tungstoarsenate complex Na6[Cr4(H2O)2}(AsW9O34)2] . 18H2O (CrIIIAsW9) was synthesized and investigated by elemental analysis, thermogravimetry, FT-IR, UV-VIS, EPR spectroscopy and magnetic susceptibility methods. The results suggest a sandwich-type structure in which two of the [AsW9O34]9- trilacunary Keggin fragments are connected by a Cr4O16 group of four coplanar CrO6 octahedra sharing edges. The aim of this study consists in establishing the modifications that CrIII ions make in the trivacant Keggin units, in determination of the local symmetry around the chromium ions and the identification of the nature of the chromium-chromium interactions.  
         
     
         
         
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