Synthesis and Structure of M[UO₂(C₂O₄)(NCS)] 0.5H₂O
(M = Rb or Cs)

I. V. Medrish^a, E. V. Peresypkina^b, A. V. Virovets^b, and L. B. Serezhkina^a

^a Samara State University, ul. Akademika Pavlova 1, Samara, 443011 Russia

^b Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 3,
Novosibirsk, 630090 Russia

Received July 5, 2007

Abstract—Single crystals of [UO₂(C₂O₄)(NCS)] · 0.5H₂O (M = Rb (I) or Cs (II)) have been synthesized and
studied by X-ray diffraction analysis. The compounds are isostructural, and their crystals are monoclinic with
the space group 2/, Z = 4, and unit cell parameters: a = 9.0624(5) Å, b = 13.1242(7) Å, c = 8.9204(5) Å,
=98.897(2), R = 0.0226 (I); a = 9.3171(3) Å, b = 13.2987(5) Å, c = 9.1151(3) Å, = 101.0860(10)°, R =
0.0214 (II). The main structural units of the crystals of I and II are the [[UO₂(C₂O₄)(NCS)] chains belonging
to the crystal-chemical group AK⁰²M¹ (A = K⁰² = M¹ = NCS of the uranyl complexes. The
uranium-containing chains are joined into a three-dimensional framework through electrostatic interactions
with the outer-sphere cations and hydrogen bonds involving the water molecules.

DOI: 10.1134/S0036023608070115

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