Crystal structure of 2,3,5,6-tetra-bromo-tereph-thalo--nitrile

The title crystal (systematic name: 2,3,5,6-tetra-bromo-benzene-1,4-dicarbonitrile), C Br N , is the first bromo analog in a study of cyano-halo (C≡N⋯ ) non-bonded contacts in crystals of halogenated di-cyano-benzenes. The complete mol-ecule is generated by a crystallographic center of symmetry. In the extended structure, each Br atom accepts one C≡N⋯Br inter-action, and each N atom is bis-ected by two. This contact network forms a nearly planar sheet structure propagating in the (01) plane, similar to that reported in hexa-methyl-benzene co-crystals of the tetra-chloro analog.