Bis(trimethylammonium) tetrachloromercurate(II) at 343K

Titelangaben

Amami, Mongi ; van Smaalen, Sander ; Ben Salah, Abdelhamid:
Bis(trimethylammonium) tetrachloromercurate(II) at 343K.
In: Acta Crystallographica Section E. Bd. 58 (2002) Heft 8 . - m416-m419.
ISSN 1600-5368
DOI: https://doi.org/10.1107/S160053680201214X

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Abstract

In order to investigate a possible phase transition at 324 K in the title compound, (NHMe3)2[HgCl4], the crystal structures at 295 and 343 K have been determined, using restrictions of the non-crystallographic site symmetry of the tri­methyl­ammonium (TrMA) ions. The hydrogen-bond network, namely N-H...Cl, undergoes a considerable change, by a 38° rotation of one of the TrMA cations about the N-H bond axis. This transition is shown to be a non-symmetry-breaking structural transition, which corresponds to a gradual loss of the orientational order of the TrMA cations.