2-Amino-ethanaminium iodide.

The title salt, [NH(3)CH(2)CH(2)NH(2)](+)·I(-), has an array structure based on strong inter-molecular N-H⋯N hydrogen bonding formed between the ammonium and amine groups of adjacent cations. This inter-action gives a helical chain of cations that runs parallel to the b axis. The four remaining NH group H atoms all form hydrogen bonds to the iodide anion, and these iodide anions lie in channels parallel to the cation-cation chains.