Crystal structure and Hirshfeld surface analysis of a pyridiniminium bromide salt: 1-[2-([1,1′-biphen­yl]-4-yl)-2-oxoeth­yl]-3-methyl-1,4-di­hydro­pyridin-4-iminium bromide

In the cation of the title salt, C(20)H(19)N(2)O(+)·Br(−), the phenyl rings are inclined to one another by 38.38 (8)°, whereas the central phenyl ring and the pyridiniminium ring are almost perpendicular with a dihedral angle of 87.37 (9)°. The N(+)=C cationic double bond was verified by the shortened bond length of 1.337 (2) Å. In the crystal, the Br(−) anion is linked to the cation by an N—H⋯Br hydrogen bond. C—H⋯O hydrogen bonds link adjacent pyridiniminium cations into inversion dimers with an R (2) (2)(18) graph-set motif. These dimers are stacked in a phen­yl–phenyl T-shaped geometry through C—H⋯π inter­actions. A Hirshfeld surface analysis was conducted to verify the contributions of the different inter­molecular inter­actions.