The title crystal (systematic name: 2,3,5,6-tetra-bromo-benzene-1,4-dicarbonitrile), C8Br4N2, is the first bromo analog in a study of cyano-halo (C≡N⋯X) 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.

The crystal structure of 2,3,5,6-tetra-bromo-tereph-thalo-nitrile reveals a nearly planar sheet structure with cyano-halo non-bonded contacts, similar to those in hexa-methyl-benzene co-crystals.

Paper

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

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