Research Article: 2-Amino-3-carb­oxy­pyridinium chloride hemihydrate

Date Published: May 01, 2012

Publisher: International Union of Crystallography

Author(s): Rafika Bouchene, Sofiane Bouacida, Fadila Berrah, Jean-Claude Daran.


The asymmetric unit of the title compound, C6H7N2O2+·Cl−·0.5H2O, consists of two protonated 2-amino-3-carb­oxy­pyridine cations, two chloride anions and one mol­ecule of water. The crystal packing can be described as alternating layers of cations and anions parallel to (110), which are linked together by Ow—H⋯Cl inter­actions. In the crystal, four types of classical hydrogen bonds are observed, viz. cation–anion (O—H⋯Cl and N—H⋯Cl), cation–cation (N—H⋯O), cation–water (N—H⋯Ow) and water–anion (Ow—H⋯Cl), resulting in the formation of an infinite three-dimensional network.

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For applications of hybrid organic–inorganic compounds, see: Bouacida (2008 ▶); Kickelbick (2007 ▶); Mitzi et al. (1998 ▶); Asaji et al. (2007 ▶); Lynch & Jones (2004 ▶). For related structures, see: Beatty (2003 ▶); Sengupta et al. (2001 ▶); Berrah et al. (2011a ▶,b ▶,c ▶); Akriche & Rzaigui (2007 ▶).