4-(4-Amino-5-thioxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)pyridinium chloride

The crystal structure of the title compound, C7H8N5S+·Cl−, is stabilized by intermolecular N—H⋯Cl and N—H⋯S hydrogen-bond interactions.

The crystal structure of the title compound, C 7 H 8 N 5 S + ÁCl À , is stabilized by intermolecular N-HÁ Á ÁCl and N-HÁ Á ÁS hydrogen-bond interactions.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: AT2609).

Comment
An important type of fungicides, triazole compounds are highly efficient and of low tocicity (Shi et al.,1995;Xu, et al., 2002). The part of our research is to find triazole with higher cooperational activity, we synthesized the title compound (I) and report its crystal structure here.

Experimental
The title compound (I) was prepared by the process as following: ethyl isonicotinate 1.51 g (0.01 mol) and hydrazine hydrate 0.32 g (0.01 mol) with ethanol at 377 K for 3 h, afford ivory-white compound A 1.32 g (yield 96%), then add 0.06 ml carbon disulfide and KOH 0.56 g (0.01 mol) with ethanol, stirred at room temperature for 5 h, afford yellow compound B 2.0 g (yield 85.6%). At last, add 0.32 g hydrazine hydrate to the compound B with water at 377 K for 12 h. Single crystals suitable for X-ray measurements were obtained by recrystallization from DMF-HCl (3:1) at 334 K.

Refinement
The H atoms of the NH 2 group were found from a difference Fourier map and refined freely. The other H atoms were positioned geometrically and allowed to ride on their parent atoms, with N-H and C-H distances of 0.86 and 0.93 Å, respectively, and with U iso (H) = 1.2U eq of the parent atoms. Fig. 1. The molecular structure of the title compound with the atom-labeling scheme. Displacement ellipsoids are drawn at the 30% probability level.