5-Amino-1H-benzimidazole-2(3H)-thione: mol­ecular, crystal structure and Hirshfeld surface analysis

The title compound, C(7)H(7)N(3)S, which has potential biological activity, can be used as a ligand in metal complexation. This compound exists as the thione tautomer in the crystal phase, which is confirmed by the study of its mol­ecular structure. The amino group has pyramidal configuration. In the crystal phase, the two independent mol­ecules in the asymmetric unit form tetra­mers as a result of N—H⋯S hydrogen bonds. These tetra­mers are linked by N—H⋯N hydrogen bonds, forming chains/tubes in the [010] direction. The Hirshfeld surface analysis showed that the highest contribution to the total surface is provided by H⋯H inter­actions as well as S⋯H/H⋯S and C⋯H/H⋯C contacts associated with X—H⋯S hydrogen bonds and X—H⋯C(π) inter­actions.