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Structure of caesium disulfate at 120 and 273 K

Details

Publisher
International Union of Crystallography
Copyright
Copyright (c) 2009 International Union of Crystallography
Subject
caesium disulfate, phase transition, catalyst, order-disorder
ISSN
0108-7681
eISSN
1600-5740
D.O.I.
10.1107/S0108768109029334
Publisher site
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Structure of caesium disulfate at 120 and 273 K

Abstract

The crystal structures of Cs2S2O7 at 120 and 273 K have been determined from X-ray single-crystal data. Caesium disulfate represents a new structure type with a uniquely high number of independent formula units at 120 K: In one part caesium ions form a tube surrounding the disulfate ions, Cs8(S2O7)6+n; in the other part a disulfate double-sheet sandwiches a zigzagging caesium ion chain, Cs2(S2O7)6-n. Caesium disulfate shows an isostructural order-disorder transition between 230 and 250 K, where two disulfate groups become partially disordered above 250 K. The Cs+-ion arrangement shows a remarkable similarity to the high-pressure RbIV metal structure.
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