Journal article

Publication year: 2014

Pages: 3371-3379

Journal: Organic & Biomolecular Chemistry

Volume number: 12

Issue number: 21

ISSN: 1477-0520

Open access status: Hybrid

DOI Link: https://doi.org/10.1039/c4ob00230j

Publisher: Royal Society of Chemistry

Abstract: 
The isomerization properties of an azocarbazole macrocycle in solution were investigated utilizing NMR spectroscopy with in situ irradiation in combination with DFT calculations. It was demonstrated that the position of azo units in a rigid macrocyclic system influences the photoisomerization pathway even if the initial all-E isomer is highly symmetric. Furthermore, the effect of ring strain on lowering the rates of thermal isomerization was demonstrated and a mechanism via an inversion-rotation proposed. The herein presented results and methods give new insights into the general nature of the azobenzene unit. In particular we illustrate the effect of symmetry changes due to macrocyclic arrangement on the photochemical and thermal isomerization properties, which will stimulate future development towards multinary molecular switches.

Harvard Citation style: Schweighauser, L., Häussinger, D., Neuburger, M. and Wegner, H. (2014) Symmetry as a new element to control molecular switches, Organic and Biomolecular Chemistry, 12(21), pp. 3371-3379. https://doi.org/10.1039/c4ob00230j

APA Citation style: Schweighauser, L., Häussinger, D., Neuburger, M., & Wegner, H. (2014). Symmetry as a new element to control molecular switches. Organic and Biomolecular Chemistry. 12(21), 3371-3379. https://doi.org/10.1039/c4ob00230j