Acta Cryst. (2008). E64, o1553 [ doi:10.1107/S1600536808022319 ]
Abstract: The structure of the title compound, C5H5N2O2+·Cl-, is composed of chloride anions and 4-carboxypyridazin-1-ium cations. Chloride anions bridge the cations via O-HCl and N-HCl hydrogen bonds to form ribbons. The latter, linked by van der Waals forces with lengths in the range 3.254 (2)-3.497 (2) Å, form coplanar layers. Very weak interactions operate also between adjacent layers, as indicated by their spacing of 3.339 (1) Å.
Online 19 July 2008
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