Acta Crystallographica Section B

Volume 65, Part 1 (February 2009)

research papers

Acta Cryst. (2009). B65, 54-58 [ doi:10.1107/S0108768108035234 ]

Planar packing of tetrachlorodicyanobenzenes. II

D. Britton

Abstract: Equimolar mixtures of ortho- and meta-, or ortho- and para-, or meta- and para-tetrachlorodicyanobenzene, C₆Cl₄(CN)₂, form structures with disordered layers containing both kinds of molecules in rhombohedral or pseudo-rhombohedral cells. These structures are similar to the structure of the rhombohedral form of the meta isomer. The guiding force appears to be an intermolecular synthon, in which a nitrile group in one molecule interacts with Cl atoms in two adjacent molecules with NCl distances of approximately 3.1 Å.

Keywords: planar packing; disorder; polymorphism; synthons.


	Structure factor file (CIF format) (12.8 kbytes) [ doi:10.1107/S0108768108035234/bs5066M-IIsup2.hkl ] Contains datablock M-II

	Structure factor file (CIF format) (10.3 kbytes) [ doi:10.1107/S0108768108035234/bs5066O-Psup3.hkl ] Contains datablock O-P

	Structure factor file (CIF format) (29.6 kbytes) [ doi:10.1107/S0108768108035234/bs5066M-P-IIsup4.hkl ] Contains datablock M-P-II

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