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Figure 6
Calculated HOMO and lowest unoccupied molecular orbital (LUMO) in a pair of closely interacting TCNE radical anions, indicating two-electron/multicentric covalent bonding. SOMO denotes a singly occupied molecular orbital. Adapted from Cui et al. (2014BB18a).

IUCrJ
Volume 6| Part 2| March 2019| Pages 156-166
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519000186