Uranyl Incorporation into the Polyoxometalate Cavity. Synthesis and Characterization of [(UO2)8P8W48O184]24–

Resumo

The reaction of uranyl nitrate with the [P₈W₄₈O₁₈₄]^40– polylacunary polyanion gives the [(UO₂)₇P₈W₄₈O₁₈₄]^26– (1) and [(UO₂)₈P₈W₄₈O₁₈₄]^24– (2) anions, which were isolated as potassium and ammonium salts. For K₂₄[(UO₂)₈P₈W₄₈O₁₈₄] · 50H₂O · 3LiCl and (NH₄)₁₆H₈[(UO₂)₈P₈W₄₈O₁₈₄] · 50H₂O, X-ray diffraction study was performed. The incorporation of uranyl ions into [P₈W₄₈O₁₈₄]^40– was confirmed by IR and Raman spectroscopy and by mass spectrometry. Electrochemical study of 2 indicated the possibility of uranium reduction to U(IV). X-ray luminescence of the potassium salts of 1 and 2 was investigated.