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Figure 1
(a) Crystal structure of 3,4-dichlorophenol: hydrogen bond (red), type I contacts (green) and type II contacts (blue) showing the symmetry requirement for different non-covalent interactions. (b) The halogen bond acts as interlayer glue pulling two layers together.

IUCrJ
Volume 1| Part 1| January 2014| Pages 49-60
ISSN: 2052-2525
https://doi.org/10.1107/S2052252513025657