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Figure 1
(a) A representation of a σ-hole on a halogen atom (X = F, Cl, Br, I). (b) The ideal geometry for a σ-hole interaction. (c) The ideal geometry for a π-hole interaction.

IUCrJ
Volume 5| Part 5| September 2018| Pages 647-653
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518011041