6-phenyl-3-(4-pyridyl)-1,2,4-triazolo[3,4-b][1,3,4]thiadiazole.

The title compound, C(14)H(9)N(5)S, has been synthesized and characterized both spectroscopically and structurally. The triazolo-thiadiazole system, the pyridine ring and the phenyl ring are all planar. The plane of the triazolo-thiadiazole system forms dihedral angles of 1.53 (13) and 7.55 (12) degrees with the planes of the pyridine and phenyl rings, respectively. In the molecule, there are two intramolecular interactions of types C-H...N and C-H...S. Intermolecular C-H...N interactions involving a phenyl CH group and a triazole N atom lead to the formation of a one-dimensional chain. In the crystal structure, two types of pi-pi interactions affect the packing of the molecules. In addition, there are intermolecular non-bonded S...N contacts of 2.870 (2) A, which may cause steric hindrance.