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- Title
Halogen bonding stabilizes a cis-azobenzene derivative in the solid state: a crystallographic study.
- Authors
Saccone, Marco; Siiskonen, Antti; Fernandez-Palacio, Franisco; Priimagi, Arri; Terraneo, Giancarlo; Resnati, Giuseppe; Metrangolo, Pierangelo
- Abstract
Crystals of trans- and cis-isomers of a fluorinated azobenzene derivative have been prepared and characterized by single-crystal X-ray diffraction. The presence of F atoms on the aromatic core of the azobenzene increases the lifetime of the metastable cis-isomer, allowing single crystals of the cis-azobenzene to be grown. Structural analysis on the cis-azobenzene, complemented with density functional theory calculations, highlights the active role of the halogen-bond contact (N...I synthon) in promoting the stabilization of the cis-isomer. The presence of a long aliphatic chain on the azobenzene unit induces a phase segregation that stabilizes the molecular arrangement for both the trans- and cis-isomers. Due to the rarity of cis-azobenzene crystal structures in the literature, our paper makes a step towards understanding the role of non-covalent interactions in driving the packing of metastable azobenzene isomers. This is expected to be important in the future rational design of solid-state, photoresponsive materials based on halogen bonding.
- Subjects
AZOBENZENE; HALOGENS; ISOMERIZATION
- Publication
Acta Crystallographica Section B: Structural Science, Crystal Engineering & Materials, 2017, Vol 73, Issue 2, p227
- ISSN
2052-5192
- Publication type
Article
- DOI
10.1107/S2052520617003444