期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 51, 页码 18552-18556出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201910734
关键词
azobenzenes; London dispersion; molecular probes; solvent effects; spectroscopy
资金
- Justus Liebig University Giessen
- Deutsche Forschungsgemeinschaft [SPP1807]
Interactions on the molecular level control structure as well as function. Especially interfaces between innocent alkyl groups are hardly studied although they are of great importance in larger systems. Herein, London dispersion in conjunction with solvent interactions between linear alkyl chains was examined with an azobenzene-based experimental setup. Alkyl chains in all meta positions of the azobenzene core were systematically elongated, and the change in rate for the thermally induced Z -> E isomerization in n-decane was determined. The stability of the Z-isomer increased with longer chains and reached a maximum for n-butyl groups. Further elongation led to faster isomerization. The origin of the intramolecular interactions was elaborated by various techniques, including H-1 NOESY NMR spectroscopy. The results indicate that there are additional long-range interactions between n-alkyl chains with the opposite phenyl core in the Z-state. These interactions are most likely dominated by attractive London dispersion. This work provides rare insight into the stabilizing contributions of highly flexible groups in an intra- as well as an intermolecular setting.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据