title: Crystal structure of 2-(1H-imidazol-3-ium-4-yl)ethanaminium dichloride, a re-determination.
abstract: The crystal structure of the title mol-ecular salt, C5H11N3 (+)·2Cl(-), was redetermined. In comparison with the previous study [Bonnet et al. (1975 ▸). Bull. Soc. Fr. Mineral. Crist. 98, 208-213.], the positions of some H atoms were corrected, allowing a more accurate description of the hydrogen-bonding scheme. In addition, the absolute structure was also determined. The maximum differences in terms of bond lengths and angles between the two determinations are 0.022 Å and 1.43°, respectively. The organic cation display a anti conformation of the protonated amine function and the imidazolium ring. The dihedral angle between the imidazolium plane and the plane through the C-C-N side chain is 29.58 (3)°. In the crystal, the organic cations and Cl(-) anions are stacked alternatively into layers parallel to (100). N-H⋯Cl hydrogen bonds between all H atoms of the ammonium group and both N-H groups of the imidazolium ring and the Cl(-) acceptor anions lead to the linkage of organic and inorganic layers into a three-dimensional network.
authors.affiliation: Laboratoire de Chimie Inorganique et Environnement, Universite de Tlemcen, BP119, 13000, Tlemcen, Algeria.
authors.forename: Samira
authors.initials: S
authors.lastname: Louhibi
authors.affiliation: Laboratoire de Chimie Inorganique et Environnement, Universite de Tlemcen, BP119, 13000, Tlemcen, Algeria.
authors.forename: Imene
authors.initials: I
authors.lastname: Belfilali
authors.affiliation: Laboratoire de Chimie Inorganique et Environnement, Universite de Tlemcen, BP119, 13000, Tlemcen, Algeria.
authors.forename: Leila
authors.initials: L
authors.lastname: Boukli-Hacene
authors.affiliation: Centre de Diffractometrie X, UMR 6226 CNRS, Unite Sciences Chimiques de Rennes, Universite de Rennes I, 263 Avenue du General Leclerc, 35042 Rennes, France.
authors.forename: Thierry
authors.initials: T
authors.lastname: Roisnel
keywords: crystal structure; histamine; hydrogen bonding; redetermination