5-(1H-Tetra­zol-5-yl)-1H-indole monohydrate

In the title compound, C(9)H(7)N(5)·H(2)O, the inter­planar angles between the benzene and tetra­zole rings and between the benzene and imidazole rings are 8.71 (3) and 1.32 (2)°, respectively. In the crystal, strong N—H⋯N hydrogen bonds link the organic 5-(1H-tetra­zol-5-yl)-1H-indole mol­ecules into chains extended along the b axis. The chains are further inter­connected into layers parallel to (100) via strong O—H⋯N and N—H⋯O hydrogen bonds. Furthermore, the layers are inter­connected via strong O—H⋯N hydrogen bonds. Moreover, cohesion between the layers is provided by the π–π inter­actions between the imidazole, tetra­zole and benzene rings with centroid–centroid distances of 3.766 (2), 3.832 (2) and 3.733 (2) Å.