Research Article: 2-Amino-3-carb­oxy­pyrazin-1-ium perchlorate bis­(2-amino­pyrazin-1-ium-3-carboxyl­ate) monohydrate

Date Published: June 01, 2012

Publisher: International Union of Crystallography

Author(s): Fadila Berrah, Sofiane Bouacida, Ahlem Bouhraoua, Thierry Roisnel.


The asymmetric unit of the title compound, C5H6N3O2+·ClO4−·2C5H5N3O2·H2O, comprises two symmetry-independent zwitterions, one cation, one perchlorate anion and one water mol­ecule. In the crystal, the three different types of organic entities are linked by N—H⋯O and N—H⋯N hydrogen bonds, forming undulating sheets parallel to (1-10). These sheets are in turn connected by O—H⋯N and O—H⋯O hydrogen bonds involving perchlorate anions and water mol­ecules, forming a three-dimensional network. Intra­molecular N—H⋯O and weak inter­molecular C—H⋯O hydrogen bonds are also present.

Partial Text

For crystal structures of hybrid compounds obtained from 3-amino-pyrazine 2-carb­oxy­lic acid, see: Berrah et al. (2011a ▶,b ▶,c ▶). For related perchlorate compounds, see: Bendjeddou et al. (2003 ▶); Berrah et al. (2012 ▶); Toumi Akriche et al.(2010 ▶).




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