A second polymorph of 3,4 bis(6 bromopyridin 3 yl) 1,2,5 thiadiazole
The title compound, C12H6Br2N4S, a second polymorph in the triclinic space group P 1, is presented. As in the earlier reported monoclinic polymorph in the space group C2/c [Becker et al. (2016) Chem. Eur. J. In the press] the thiadiazole ring is planar with an r.m.s. deviation of 0.004 A. The five membered ring is tilted with respect to the two pyridyl substituents by 23.16 (7) and 49.47 (9)deg. In the crystal, molecules are linked by a weak non bonding BrN interaction [3.056 (3) A] Furthermore, a column of molecules is established along the b axis by p p stacking interactions between the pyridine rings [centroid centroid distances 3.7014 (16) and 3.5934 (15) A] Additionally, a short intermolecular BrBr contact [3.3791 (6) A] and Brp aryl contacts [3.6815 (11) 3.7659 (12) A] towards the thiadiazole and pyridine rings are found.