10.1002/anie.201910734
Angewandte Chemie International Edition
COMMUNICATION
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further proof that London dispersion interactions in solution are
still contributing in a relevant way even to chemical systems with
a high degree of flexibility. These results provide a deeper
insight of how to adjust the subtle balance between steric
repulsion, attractive London dispersion and entropy with flexible
dispersion energy donors according to the desired needs.
The excellent solubility of these azobenzenes in a broad variety
of solvents as well as their modular synthesis provides the
possibility to extend the investigation also to other types of
interactions, i. e. fluoroalkyl-fluoroalkyl or fluoroalkyl-alkyl, as
well as other solvent systems in the future.
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Conflicts of interest
There are no conflicts to declare.
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Acknowledgements
Financial support was provided by the Justus Liebig University
Giessen and by the Deutsche Forschungsgemeinschaft
(SPP1807). We thank Dr. Heike Hausmann and Anja Platt for
NMR support and Jan M. Schümann for the fruitful discussions.
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Keywords: London dispersion • azobenzene • molecular probe •
solvent effects • spectroscopy
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