Thio­phene-2-carbonyl azide

The title compound, C₅H₃N₃OS, is almost planar (r.m.s. deviation for the ten non-H atoms = 0.018 Å) and forms an extended layer structure in the (100) plane, held together via hydrogen-bonding inter­actions between adjacent mol­ecules. Of particular note is the occurrence of RC—H...N⁻=N⁺=NR inter­actions between an aromatic C—H group and an azide moiety which, in conjunction with a complementary C—H...O=C inter­action, forms a nine-membered ring.