4-[(Benzyl-amino)-carbon-yl]-1-methyl-pyridinium halogenide salts: X-ray diffraction study and Hirshfeld surface analysis.

Two salts of 4-[(benzyl-amino)-carbon-yl]-1-methyl-pyridinium ( Am ) with chloride (C 14 H 15 N 2 O + ·Cl - ) and bromide (C 14 H 15 N 2 O + ·Br - ) anions were studied and compared with the iodide salt. AmCl crystallizes in the centrosymmetric space group P 2 1 / n while AmBr and AmI form crystals in the Sohncke space group P 2 1 2 1 2 1 . Crystals of AmBr are isostructural to those of AmI . The cation and anion are bound by an N-H⋯Hal hydrogen bond. Hirshfeld surface analysis was used to compare different types of inter-molecular inter-actions in the three structures under study.