Acta Cryst. (2007). E63, o2933 [ doi:10.1107/S1600536807022866 ]
Abstract: The title compound, C13H17N4O+·Cl-, contains a cation protonated at its pyridine ring N atom. Pyridinium and amide NH groups (from two different cations) form hydrogen bonds with the Cl- ion, together with three weaker C-HCl interactions. The pyrazole rings of the cations associate into cyclic dimers through N-HN hydrogen bonding. The N-HN and N-HCl interactions combine to associate the cations and anions into alternating chains along the  vector, generated by crystallographic inversion centres. These chains are then further aggregated by a C-HCl interaction into two-dimensional layers parallel to (010).
Online 23 May 2007
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