A new polymorph of 2,5-bis­(4-pyrid­yl)-1,3,4-thia­diazole

A new polymorph of 2,5-bis­(4-pyrid­yl)-1,3,4-thia­diazole, C₁₂H₈N₄S, obtained under hydro­thermal conditions, is described. In this structure, the two terminal pyrid­yl groups are inclined to the central thia­diazole ring with dihedral angles of 6.47 (2) and 29.95 (5)°, and the dihedral angle between the pyrid­yl ring planes is 23.65 (6)°. An inter­molecular C—H...N weak inter­action is observed. The structural differences of two polymorphs of 2,5-bis­(4-pyrid­yl)-1,3,4-thia­diazole are also discussed.