1-{5-[2-(trifluoromethyl)phenyl]1,3,4-thiadiazol-2-yl}guanidinium chloride

In the title compound, C10H9F3N5S+. Cl-, which was developed as a potential anticonvulsant, the phenyl ring, the thiadiazole ring and the guanidinium moiety are all planar. There is a dihedral angle of 48.9 (1)degrees between the thiadiazole and phenyl rings which prevents steric hindrance arising f rom the Ir bonds within the former, and the trifluorophenyl moiety attached to the latter. The thiadiazole and guanidinium moieties are twisted by 12. 7 (2)degrees with respect to each other. An extensive network of hydrogen b onds, predominantly involving the chloride ion, maintains the crystal struc ture.