2-(1,3-Benzothia­zol-2-yl)guanidinium chloride

The non-H atoms of the cation of the title salt, C8H9N4S+·Cl−, are approximately co-planar (r.m.s. deviation = 0.037 Å), with one amino group forming an intra­molecular hydrogen bond to the tertiary N atom of the benzothia­zole fused-ring system. The cations and anions are linked by cyclic R 2 1(6) N—H⋯Cl hydrogen-bonding associations, generating helical chains running along the b-axis direction

2-(1,3-Benzoxazol-2-yl)guanidinium chloride

The non-H atoms of the cation of the title salt, C8H9N4O+·Cl−, are approximately co-planar (r.m.s. deviation = 0.024 Å) with one amino group forming an intra­molecular hydrogen bond to the tertiary N atom of the benzoxazole fused-ring system. The cations and anions are linked by cyclic R 2 1(6) N—H⋯Cl hydrogen-bonding associations, generating linear chains running along the a-axis direction