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    STUDIA CHEMIA - Issue no. 1-2 / 2000  
         
  Article:   SPECTROPHOTOMETRIC AND PAPER ELECTROPHORETIC STUDIES OF THE COPPER (II) POLYOXOTUNGSTOBISMUTHATE COMPLEXES.

Authors:  DAN RUSU, CRISTINA ROÅžU, MARIANA RUSU, GHEORGHE MARCU. 		 
       
         
  Abstract:  The starting point of this study is represented by the trilacunar structure of the polyoxotungstate anion [BiW9O33]9- having the capacity of functioning as the coordinating ligand for the cupper Cu2+ cation, and the formation of the complex polyoxotungstate anions of the type [Cu3(BiW9O33)2]12-.and [Cu4(BiW9O33)2]10-. The pH range of the complexes’ formation was established and the stability constants were calculated by the electrophoresis method. By applying the molar ratio method to spectrophotometry, the molar ratio of polyoxometalate ligands and Cu2+ cations have been found to have the values of 2:3 and 2:4, respectively.  
         
     
         
         
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