2-Cyano-1-methyl­pyridinium iodide

The cation in the title compound, C₇H₇N₂⁺·I⁻, is planar (r.m.s. deviation for the nine fitted non-H atoms = 0.040 Å). The crystal packing is best described as undulating layers of cations and anions associated via C—H...I inter­actions.

2-Cyano­anilinium iodide

The solid-state structure of the title salt, C₇H₇N₂^+.I⁻, consists of cation–anion sheets lying parallel to (110), with the components linked by N—H...I hydrogen bonds.