Author(s) Larvor, C.; Stöger, B.
Journal Acta Crystallogr E Crystallogr Commun
Date Published 2017 Jul 01

Rubidium hydrogen carbonate, RbHCO3, features an order/disorder phase transition at TC = 245 K from the high-temperature (HT) disordered C2/m modification to the low-temperature (LT) C-1 modification. The crystal structures are characterized by [HCO3]2(2-) pairs of hydrogen carbonate groups connected by strong hydrogen bonding. The [HCO3]2(2-) pairs are connected by Rb(+) cations into a three-dimensional network. In HT-RbHCO3, the hydrogen atom is disordered. In LT-RbHCO3, ordering of the hydrogen atom leads to a translation-engleiche symmetry reduction of index 2. The lost reflections and rotations are retained as twin operations.

DOI 10.1107/S2056989017008271
ISSN 2056-9890
Citation Acta Crystallogr E Crystallogr Commun. 2017;73(Pt 7):975979.

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