SPECTROSCOPIC STUDIES OF POLYOXOMETALATES AND THEIR COMPLEXES WITH LANTHANIDE(III) IONS IN SOLUTION

Tile results of investigations related to physico-chemical properties, synthesis and structure of polyoxometalates and their lanthanide(III) complexes are briefly reviewed. Useful techniques for the verificatio n of polyoxometalate compositions and tile determination of components are compared. Complexation of metal ions, especially of lanthanide(II I) ions, with polyoxometalates using absorption (ill tile UV-visible a nd tile near In region) and luminescence spectroscopy methods are pres ented. Absorption hypersensitive transitions of certain lanthanide(III ) lolls and laser-induced europium(III) ion luminescence spectroscopy are shown to be useful in complexation investigations. The significanc e of some polyoxometalate complexes as potential magnetic resonance im aging agents and ill biological studies as antiviral agents are discus sed.