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Figure 1
Projection of the 200 K structure of [(CH[_{3}])[_{4}]N](BF[_{4}]) (Palacios et al., 1996BB6) along the [c] axis. [(CH[_{3}])[_{4}]N](ClO[_{4}]) has the same type of structure at 210 K, if we replace F atoms by O atoms and B atoms by Cl atoms. The ClO4− or BF4− ions are randomly disordered over four orientations (numbered 1 to 4 in the text). The F or O atoms corresponding to the orientation of each sublattice are marked with the same number. The low-temperature ordering mode is represented by grey circles.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 59| Part 5| September 2003| Pages 625-633
doi:10.1107/S0108768103019013
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