1-Butyl-2,3,3-trimethylindol-1-ium iodide

In the title molecular salt, C15H22N+·I−, the fused-ring system is slightly puckered [dihedral angle between the five- and six-membered rings = 3.43 (8)°]. In the crystal, very weak C—H...I interactions link the cations to the anions. Photophysical data for the title salt in different solvents are presented.