Abstract
Four new fluorochromatouranylates, namely, K[UO2(CrO4)F] · 1.5H2O (I), Rb[UO2(CrO4)F] · 1.5H2O (II), Rb[UO2(CrO4)F] · 0.5H2O (III), and Cs[UO2(CrO4)F] · 0.5H2O (IV), have been synthesized, and their crystallographic characteristics have been determined. All the compounds crystallize in monoclinic system, space group P21/c, with the unit cell parameters a = 13.1744(5) Å, b = 9.4598(3) Å, c = 13.0710(4) Å, β = 103.746(1)°, Z = 4, R = 0.0235 (I); a = 13.5902(7) Å, b = 9.5022(4) Å, c = 13.2271(6) Å, β = 102.914(2)°, Z = 4, R = 0.0247 (II); a = 24.7724(8) Å, b = 12.6671(4) Å, c = 9.4464(3) Å, β = 97.661(1)°, Z = 8, R = 0.0448 (III); a = 25.725(1) Å, b = 12.8261(5) Å, c = 9.4929(4) β = 97.208(1)°, Z = 8 (IV). The pairs of compounds I and II and compounds III and IV are isostructural. Crystals of compounds I–III have been subjected to complete X-ray diffraction study. It has been established that the structures of compounds I–III are built of [UO2(CrO4)F] n− n layers, which are parallel to the (100) plane and linked into a framework by alkali-metal cations located between layers, together with water molecules. The effect of topological and geometric isomerism on the structural features of 34 known uranyl compounds of the AT3M2 crystallochemical group, to which the studied compounds I–III also belong, is discussed.
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Original Russian Text © V.N. Serezhkin, E.V. Peresypkina, S.A. Novikov, A.V. Virovets, L.B. Serezhkina, 2014, published in Zhurnal Neorganicheskoi Khimii, 2014, Vol. 59, No. 8, pp. 1008–1017.
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Serezhkin, V.N., Peresypkina, E.V., Novikov, S.A. et al. New fluorochromatouranylates of alkali metals: Synthesis and structure. Russ. J. Inorg. Chem. 59, 788–797 (2014). https://doi.org/10.1134/S003602361408018X
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DOI: https://doi.org/10.1134/S003602361408018X