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Figure 12
Frequency distributions for X⋯X (X = Cl/Br/I) XB interactions within homo-X3 synthons. For X = Cl, Br and I, the X⋯X distance and the |Δζ| angular orientation are represented in (a) and (d), (b) and (e), and (c) and (f), respectively. The motif shown in Fig. 10[link](b) was used for the CSD search with the geometrical parameters d(X⋯X) ≤ sum(vdW) + 0.4 Å and ζ1 and ζ2 angles within the range 100–180°. vdW radii = 1.75, 1.85 and 1.98 Å for Cl, Br and I atoms, respectively.

IUCrJ
Volume 12| Part 3| May 2025|
ISSN: 2052-2525
https://doi.org/10.1107/S2052252525001447