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    Crystal structure and Hirshfeld surface analysis of a new polymorph of (E)-2-(4-bromo­phen­yl)-1-[2,2-di­bromo-1-(3-nitro­phen­yl)ethen­yl]diazene
    (2022) Atioğlu, Zeliha; Akkurt, Mehmet; Shikhaliyev, Namiq Q.; Mammadova, N. A.; Mammadova, Naila A.; Babayeva, Gülnara V.; Khrustalev, Victor N.; Bhattarai, Ajaya
    A new polymorph of the title compound, C14H8Br3N3O2, (form-2) was obtained in the same manner as the previously reported form-1 [Akkurt et al. (2022[Akkurt, M., Yıldırım, S. Ö., Shikhaliyev, N. Q., Mammadova, N. A., Niyazova, A. A., Khrustalev, V. N. & Bhattarai, A. (2022). Acta Cryst. E78, 732-736.]). Acta Cryst. E78, 732–736]. The structure of the new polymorph is stabilized by a C—H?O hydrogen bond that links mol­ecules into chains. These chains are linked by face-to-face ?–? stacking inter­actions, resulting in a layered structure. Short inter-mol­ecular Br?O contacts and van der Waals inter­actions between the layers aid in the cohesion of the crystal packing. In the previously reported form-1, C—H?Br inter­actions connect mol­ecules into zigzag chains, which are linked by C—Br?? inter­actions into layers, whereas the van der Waals inter­actions between the layers stabilize the crystal packing of form-2. Hirshfeld mol­ecular surface analysis was used to compare the inter­molecular inter­actions of the polymorphs.