Synthesis and characterization of bis(undecatungstocuprate) lanthanates of potassium

Abstract The complexes of K 17 Ln(CuW 11 O 39 ) 2 ·nH 2 O (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Yb) have been prepared by the stepwise acidification and the stepwise addition of materials. The products were charachterized by elemental analysis, ion-exchange, conductometric titration, IR, UV, X-ray power diffraction and thermal analysis. The results show that the structure of the products is similar to that of Cs 12 U(GeW 11 O 39 ) 2 . The thermal analysis indicated that the complexes with undecatungstocuprate heteropolyanion as a ligand had higher thermal stability than that of saturated Keggin Structure dodecatungstocuprate.