Crystal structure and Hirshfeld surface analysis of a new polymorph of (E)-2-(4-bromophenyl)-1-[2,2-dibromo-1-(3-nitrophenyl)ethenyl]diazene
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Tarih
2022
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Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
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.
Açıklama
Anahtar Kelimeler
crystal structure, azo compounds, polymorphism, C—HO interactions, Hirshfeld surface analysis
