Crystal structure of dunnione p-bromophenylhydrazone

Abstract

The crystal structure of dunnione p-bromophenylhydrazone has been determined by single-crystal X-ray diffraction methods at 295 K, the structure being refined to a residual of 0.054 for 1429 'observed' reflections. Crystals are triclinic, Pī, a 15.620(8), b 8.804(4), c 7.439(4) Ǻ, α 68.03(4), β 89.85(4), γ 77.44(4)°, Z 2. The conjugation throughout the molecule is extensive and the crystal packing is dominated by intermolecular charge-transfer interactions. Bonding in the hydrazone moiety lies intermediate between those expected for hydrazone and azo forms.