Complex fluorouranates (VI). Synthesis characterization and structural assessment of new mixed-fluoro complexes of UO22+ containing phosphate, nitrate or hydrazine as the co-ligands

Chaudhuri, Mihir K. ; Srinivas, Pendyala (1994) Complex fluorouranates (VI). Synthesis characterization and structural assessment of new mixed-fluoro complexes of UO22+ containing phosphate, nitrate or hydrazine as the co-ligands Polyhedron, 13 (9). pp. 1343-1350. ISSN 0277-5387

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S02775...

Related URL: http://dx.doi.org/10.1016/S0277-5387(00)81699-X

Abstract

New mixed-fluoro complexes of UO22+ of the types A2[UO2(PO4)F(H2O)3].3H2O [A = K (1), Na (2) or NH4+ (3)], A2[UO2(NO3)3F] . 3H2O [A = K (4), Na (5) or NH4+ (6) and [UO2(N2H4)2F2] . 2H2O (7) have been synthesized. The compounds have been characterized by analyses, electrical conductance measurements and electronic, IR and laser Raman (IR) spectroscopic studies. The occurrence of trans-linked (O=U=O), coordinated fluoride and bidentate co-ligands are the common features of complexes 1-7. Typically, the scanning electron micrographs of 2 and 7 provide evidence for their crystallinity and homogeneity. The laser Raman spectra of the aqueous solutions of the systems 1-6 and the solid complexes 1-7 were recorded separately. While for the reaction solutions (cf. 1-6) the symmetric stretching frequency of O=U=O was observed at ca 840 cm-1, the band was found to occur at ca 900 cm-1 for the solids 1-7. This has been interpreted in terms of the decrease in the hydration number of the coordination shell of UO22+ of the solid complexes.

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