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    STUDIA PHYSICA - Issue no. 1 / 2012  
         
  Article:   SPECTROSCOPIC STUDIES OF LACUNARY POLYOXOTUNGSTATES CERIUM (III) COMPLEXES BASED ON α-Β-[ΒiIII W9O33]9- UNITS.

Authors:  D. RUSU, OANA BABAN, L. DAVID. 		 
       
         
  Abstract:  Two new large cerium complexes (1: K19[(BiW9O33)4WO2(H2O)]2Ce3(H2O)8(Bi4O4)].48H2O and 2: K15[Ce2(H2O)2(BiW9O33)(W5O18)2].21H2O were synthesized and characterized by chemical analysis, FT-IR and UV-Vis spectroscopy in order to determine the coordination, the ordering of cation electronic levels and the local symmetry. Based on the FT-IR spectra of the complexes we estimated that the coordination take place through the cerium ions, forming trilacunary polyoxoanion compounds. The UV and Vis electronic spectra present bands assigned to the charge transfer metal-ligand. The spectroscopic investigations indicate a sandwich-type structure for the two complexes.

Keywords: polyoxometalates, heteropolyoxotungstates, FT-IR, UV-Vis.
 
         
     
         
         
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