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Figure 9
Lattice Voronoi–Dirichlet polyhedra in: (a) the low-temperature polymorph and (b) the high-pressure polymorph of cyclopropylamine and (c) for perfect body-centred cubic packing. Combinatorial types (Peresypkina & Blatov, 2000BB32) can be written as f/v − n, where f is the number of faces and v is the number of vertices; n is just an ordinal number to distinguish different VDPs where f and v are equal. These are: (a) 14/21–1, (b) 14/24–1 and (c) 14/24–1. The combinatorial types for (b) and (c) are therefore equivalent.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 61| Part 6| November 2005| Pages 717-723
doi:10.1107/S0108768105026327
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