Research Article: dl-Alaninium iodide

Date Published: June 01, 2012

Publisher: International Union of Crystallography

Author(s): Kevin Lamberts, Ulli Englert.


The crystal structure of dl-alanine hydro­iodide (1-carb­oxy­ethanaminium iodide), C3H8NO2+·I−, is that of an organic salt consisting of N-protonated cations and iodide anions. The compound features homochiral helices of N—H⋯O hydrogen-bonded cations in the [010] direction; neighbouring chains are related by crystallographic inversion centers and hence show opposite chirality. The iodide counter-anions act as hydrogen-bond acceptors towards H atoms of the ammonium and carb­oxy groups, and cross-link the chains along [100]. Thus, an overall two-dimensional network is formed in the ab plane. No short contacts occur between iodide anions.

Partial Text

For related structures of l-alanine hydro­chloride, see: Di Blasio et al. (1977 ▶), d-alanine alaninium bromide, see: Fischer (2006 ▶), l-alanine hydro­chloride monohydrate, see: Yamada et al. (2008 ▶) and dl-alanine hydro­chloride, see: Trotter (1962 ▶).




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