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

Abstract

Two salts of 4-[(benzyl-amino)-carbon-yl]-1-methyl-pyridinium (Am) with chloride (C₁₄H₁₅N₂O⁺·Cl^-) and bromide (C₁₄H₁₅N₂O⁺·Br^-) anions were studied and compared with the iodide salt. AmCl crystallizes in the centrosymmetric space group P2₁/n while AmBr and AmI form crystals in the Sohncke space group P2₁2₁2₁. 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.

Keywords: 4-[(benzyl­amino)­carbon­yl]-1-methyl­pyridinium; Hirshfeld surface analysis; crystal structure; mol­ecular structure.