Abstract
Dicaesium hexa-nitratothorate(IV), Cs2[Th(NO3)6], was synthesized in the form of colourless crystals by reaction of thorium nitrate and caesium nitrate in aqueous solution. The Th atom is located on an inversion centre and is coordinated by six chelating nitrate anions. The resulting ThO12 coordination polyhedron is best described as a slightly distorted icosa-hedron. The Cs atom also has a coordination number of 12, but its coordination polyhedron is considerably more distorted. The crystal packing can be derived from an hexa-gonal dense packing (hcp) of idealized spherical CsO12 and ThO12 units. The CsO12 units form a distorted hcp arrangement and half of the octa-hedral sites are occupied by the ThO12 units.
Highlights
Kohler, 1989) play an important role in the production of nuclear fuel as well as in its reprocessing
Multinary thorium nitrate compounds are of potential interest as anhydrous starting materials for further chemical conversion
The thorium atom, Th1, occupies Wyckoff position 2c and has site symmetry 1. It is coordinated by six chelating nitrate anions in general positions
Summary
The thorium atom, Th1, occupies Wyckoff position 2c and has site symmetry 1 It is coordinated by six chelating nitrate anions in general positions. E70, 98–100 research communications compare quite well with Th—O distances of other reported thorium nitrate structures. Th—O distances ranging from 2.535 (2) to 2.581 (2) Å were reported (Sigmon & Burns, 2010). The An—O (An = Th) and N—O distances in the title compound are comparable to the respective distances reported for the uranyl nitrate Rb(UO2)(NO3) (Zalkin et al., 1989), with 2.474 (3) Å for An—O (An = U), 1.205 (6) Å for terminal N—O, and 1.268 (4) Å for the metal-coordinating oxygen atoms. The unit cells are similar and the space group types are identical
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