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    STUDIA CHEMIA - Issue no. 2 / 2009  
         
  Article:   SYNTHESIS AND CHARACTERIZATION OF A SANDWICH-TYPE CERIUM (IV) COMPLEX DERIVED FROM MONOLACUNARY DAWSON 2-MOLYBDO-15-TUNGSTO-2-PHOSPHATE.

Authors:  ADRIAN-RAUL TOMŞA, ANA-MARIA TODEA, DANIELA CIOLOBOC, LAURA MUREŞAN, MARIANA RUSU, VIOLETA PAŞCALĂU. 		 
       
         
  Abstract:   The reaction of monolacunary Dawson 2-molybdo-15-tungsto-2-phosphate, i.e. [1,2-P2Mo2W15O61]10- with Ce(SO4)2 in aqueous solution results in the formation of a new polyoxometalate complex, with the stoichiometry metal:ligand = 1:2. The new complex was isolated as potassium salt, i.e. K16[Ce(P2Mo2W15O61)2]•34H2O. The molecular formula was determined by elemental and thermogravimetric analysis. UV-Vis, FT-IR and 31P-NMR spectroscopy were used to characterize the new compound. Ion-exchange chromatography provided evidence for covalent, inner-sphere bonding of cerium (IV) to the monolacunary [1,2-P2Mo2W15O61]10- heteropolyoxometalate anion. The investigation results strongly suggest a sandwich-type structure with the cerium atom coordinated by two monolacunary Dawson anions.

Keywords: polyoxometalate, heteropolyoxometalate, cerium, 2-molybdo-15-tungsto-2-phosphate, 31P-NMR 		 
         
     
         
         
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