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Figure 1
Lettering denotes the different types of C—C bonds in the TCNQδ− radical used for geometric correlation between the bond lengths and charge of the ring. With increasing negative charge and radical character, bonds a and c are elongated, whereas bonds b and d are shortened.

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