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Figure 5
(a)–(c) Representation of the Hirshfeld surface of the L-histidinium cation in 1 along different crystallographic directions, with the dnorm function plotted onto the surface to highlight various inter­actions. The subscripts indicate different functional groups: (a) = NH3+; (c) = COOH; (i) = imidazolium ring; (w) = co-crystallized water mol­ecule; (CH2) = methyl­ene group.

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 81| Part 12| December 2025| Pages 1158-1163
https://doi.org/10.1107/S2056989025010023
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