Abstract
Crystals Rb2[UO2(NO3)2(NCS)2] (I) and Cs2[UO2(NO3)2(NCS)2] (II) have been synthesized and studied by IR spectroscopy and X-ray diffraction. Crystals I are monoclinic, with the following parameters: a = 12.2118(5) Å, b = 10.2545(3) Å, c = 11.8754(4) Å, β = 110.287(1)°, sp. gr. C2/c, Z = 4, and R = 0.0523. Crystals II are orthorhombic, with a = 13.7309(3) Å, b = 10.5749(2) Å, c = 10.1891(2) Å, sp. gr. Pnma, Z = 4, and R = 0.0411. The basic structural units of crystals I and II are one-core complexes [UO2(NO3)2(NCS)2]2−, which belong to the crystallochemical group cis-AB 012 M 12 (A = UO 2+2 , B 01 = NO −3 , M 1 = NCS−), which are combined into a framework via electrostatic interactions with ions of alkaline metals R (R = Rb or Cs). The structural features of crystals I and II, which condition the formation of [UO2(NO3)2(NCS)2]2− complexes with a cis rather than a trans position of isothiocyanate ions in the coordination sphere of uranyl ions, are discussed.
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Original Russian Text © V.N. Serezhkin, E.V. Peresypkina, V.A. Grigor’eva, A.V. Virovets, L.B. Serezhkina, 2015, published in Kristallografiya, 2015, Vol. 60, No. 1, pp. 51–56.
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Serezhkin, V.N., Peresypkina, E.V., Grigor’eva, V.A. et al. Synthesis and structure of R 2[UO2(NO3)2(NCS)2] (R = Rb or Cs). Crystallogr. Rep. 60, 46–51 (2015). https://doi.org/10.1134/S1063774515010204
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DOI: https://doi.org/10.1134/S1063774515010204