Abstract
In the asymmetric unit of the title compound, C16H12BrN7S, there are two crystallographically independent molecules with similar conformations. Both molecules are slightly twisted; the central 1,2,4-triazolo[ 3,4-b]-1,3,4-thiadiazine ring system makes dihedral angles of 9.65 (15) and 13.29 (15)degrees with the pyridine and benzene rings, respectively, in one molecule, whereas the corresponding values in the other molecule are 9.30 (15) and 4.84 (15)degrees. A weak intramolecular C-H center dot center dot center dot N interaction with an S(6) ring motif is observed in each molecule. In the crystal, the independent molecules are each linked through N-H center dot center dot center dot N hydrogen bonds and weak C-H center dot center dot center dot N interactions into ribbons along the c axis. The ribbons are further linked together by weak C-H center dot center dot center dot N, C-H center dot center dot center dot pi and pi-pi [centroid-centroid distances = 3.572 (2)-3.884 (2) angstrom] interactions.