Journalartikel

Jahr der Veröffentlichung: 2015

Seiten: 13436-13439

Zeitschrift: Angewandte Chemie International Edition

Bandnummer: 54

Heftnummer: 45

ISSN: 1433-7851

DOI Link: https://doi.org/10.1002/anie.201506126

Verlag: Wiley

Abstract: 
Large substituents are commonly seen as entirely repulsive through steric hindrance. Such groups have additional attractive effects arising from weak London dispersion forces between the neutral atoms. Steric interactions are recognized to have a strong influence on isomerization processes, such as in azobenzene-based molecular switches. Textbooks indicate that steric hindrance destabilizes the Zisomers. Herein, we demonstrate that increasing the bulkiness of electronically equal substituents in the meta-position decreases the thermal reaction rates from the Z to the E isomers. DFT computations revealed that attractive dispersion forces essentially lower the energy of the Z isomers.

Harvard-Zitierstil: Schweighauser, L., Strauss, M., Bellotto, S. and Wegner, H. (2015) Attraction or Repulsion? London Dispersion Forces Control Azobenzene Switches, Angewandte Chemie International Edition, 54(45), pp. 13436-13439. https://doi.org/10.1002/anie.201506126

APA-Zitierstil: Schweighauser, L., Strauss, M., Bellotto, S., & Wegner, H. (2015). Attraction or Repulsion? London Dispersion Forces Control Azobenzene Switches. Angewandte Chemie International Edition. 54(45), 13436-13439. https://doi.org/10.1002/anie.201506126