4-(1H-Tetrazol-5-yl)-1H-indole

There are two molecules with similar configurations in the asymmetric unit of the title compound, C₉H₇N₅, which are linked by intermolecular N-H⋯N hydrogen bonds into chains with graph-set motif C 2 ²(8) along the b axis. The indole core has the expected planar geometry in the two molecules, with a maximum deviation of 0.008 (8) Å from the least-squares plane defined by the nine constituent atoms, and the dihedral angles between the indole and tetrazole rings are similar [42.4 (2) and 42.7 (2)°].