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Figure 4
Different types of layers of TCNQδ− radicals observed in the compounds studied: (a) `brick wall' array of pancake-bonded dimers in 7·(TCNQ)2, (b) stacking of parallel hydrogen-bonded chains in 8·(TCNQ)2, (c) brick-wall array of pancake-bonded trimers in 10·(TCNQ)3 (A are red and B are blue), (d) brick wall array of pancake-bonded tetramers in 4·(TCNQ)2 (A are red and B are blue), (e) herringbone-like array of pancake-bonded tetramers in 9·(TCNQ)4 (A are red and B are blue) and (f) 2D array formed by stacks of equidistant radicals in 12·(TCNQ)2 (B are red and C are blue). Individual dimers, trimers and tetramers are highlighted in green; hydrogen bonds are shown as black dotted lines.

IUCrJ
Volume 9| Part 4| July 2022| Pages 449-467
ISSN: 2052-2525
https://doi.org/10.1107/S2052252522004717