New fluorochromatouranylates of alkali metals: Synthesis and structure

作者：Serezhkin V N^*; Peresypkina E V; Novikov S A; Virovets A V; Serezhkina L B

来源：Russian Journal of Inorganic Chemistry, 2014, 59(8): 788-797.

DOI：10.1134/S003602361408018X

Four new fluorochromatouranylates, namely, K[UO2(CrO4)F] center dot 1.5H(2)O (I), Rb[UO2(CrO4)F] center dot 1.5H(2)O (II), Rb[UO2(CrO4)F] center dot 0.5H(2)O (III), and Cs[UO2(CrO4)F] center dot 0.5H(2)O (IV), have been synthesized, and their crystallographic characteristics have been determined. All the compounds crystallize in monoclinic system, space group P2(1)/c, with the unit cell parameters a = 13.1744(5) , b = 9.4598(3) , c = 13.0710(4) , beta = 103.746(1)A degrees, Z = 4, R = 0.0235 (I); a = 13.5902(7) , b = 9.5022(4) , c = 13.2271(6) , beta = 102.914(2)A degrees, Z = 4, R = 0.0247 (II); a = 24.7724(8) , b = 12.6671(4) , c = 9.4464(3) , beta = 97.661(1)A degrees, Z = 8, R = 0.0448 (III); a = 25.725(1) , b = 12.8261(5) , c = 9.4929(4) beta = 97.208(1)A degrees, 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 AT(3)M(2) crystallochemical group, to which the studied compounds I-III also belong, is discussed.

• 出版日期2014-8