view article
Figure 4
Two views of the Hirshfeld surface for the pyrazinium cation within the cocrystal with dnorm mapped over the surface. Red areas indicate contacts significantly closer than the sum of the respective van der Waals radii. Dashed lines showing atom-to-atom close contacts. (a) the ‘x’ label shows the carboxyl­ate pyrazinium H⋯O contact; (b) the ‘y’ corresponds to the carboxyl­ate hydrogen bond to the two amino groups and ‘z’ corresponds to the two-pronged hydrogen bond of the carb­oxy­lic acid to the amino­pyrazine.

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 82| Part 3| March 2026| Pages 289-292
https://doi.org/10.1107/S2056989026001581
Follow Acta Cryst. E
Sign up for e-alerts
E-alerts
Follow Acta Cryst. on Twitter
Twitter
Follow us on facebook
Facebook
Sign up for RSS feeds
RSS