Crystal structure and Hirshfeld surface analysis of 5-bromo-1,3,4-thia-diazol-2-amine.

In the crystal of the title compound, C2H2BrN3S, N-H⋯N hydrogen bonds connect the mol-ecules in the form of hydrogen-bonded double-layered ribbons along the c-axis direction including R 2 2(8) and R 2 1(3) motifs, which extend to double layers in the bc-plane through the same hydrogen bonding albeit at different angles. The actual packing between these layers appears to also be a result of weak vdW inter-actions (Br/S, Br/Br) as well as Br-Br repulsion (steric and/or electrostatic). Looking along b or slightly deviating from that direction shows that the latter adopt a zipper pattern in order to not get too close to each other. Hirshfeld surface analysis indicates that N⋯H/H⋯N, Br⋯S/S⋯Br, Br⋯Br and H⋯H contacts account for 69.3% of the total contributions to the Hirshfeld surface.