Date Published: June 01, 2012
Publisher: International Union of Crystallography
Author(s): Alan R. Kennedy, Maurice O. Okoth.
The title salt, [NH3CH2CH2NH2]+·I−, has an array structure based on strong intermolecular N—H⋯N hydrogen bonding formed between the ammonium and amine groups of adjacent cations. This interaction 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.
For syntheses and structures of salt forms of the related ethylene-1,2-diammonium, see: Chen (2009 ▶); Saidi et al. (2011 ▶). For a structural example of a complex of ethylene-1,2-diammonium, see: Zhang et al. (2006 ▶). For the synthesis that gave the title compound as a by-product, see: Kennedy et al. (2011 ▶). For C–N bond length changes in another monoprotonated symmetrical diamine, see: Craig et al. (2012 ▶).