胶束
偶氮苯
化学
分子动力学
异构化
光异构化
两亲性
降水
化学物理
分析化学(期刊)
水溶液
物理化学
分子
有机化学
计算化学
聚合物
共聚物
催化作用
气象学
物理
作者
Lenka Filipová,Miriam Kohagen,Peter Štacko,Eva Muchová,Petr Slavı́ček,Petr Klán
出处
期刊:Langmuir
[American Chemical Society]
日期:2017-02-24
卷期号:33 (9): 2306-2317
被引量:10
标识
DOI:10.1021/acs.langmuir.6b04455
摘要
We designed and studied the structure, dynamics, and photochemistry of photoswitchable reverse micelles (RMs) composed of azobenzene-containing ammonium amphiphile 1 and water in chloroform at room and subzero temperatures by NMR spectroscopy and molecular dynamics simulations. The NMR and diffusion coefficient analyses showed that micelles containing either the E or Z configuration of 1 are stable at room temperature. Depending on the water-to-surfactant molar ratio, the size of the RMs remains unchanged or is slightly reduced because of the partial loss of water from the micellar cores upon extensive E → Z or Z → E photoisomerization of the azobenzene group in 1. Upon freezing at 253 or 233 K, E-1 RMs partially precipitate from the solution but are redissolved upon warming whereas Z-1 RMs remain fully dissolved at all temperatures. Light-induced isomerization of 1 at low temperatures does not lead to the disintegration of RMs remaining in the solution; however, its scope is influenced by a precipitation process. To obtain a deeper molecular view of RMs, their structure was characterized by MD simulations. It is shown that RMs allow for amphiphile isomerization without causing any immediate significant structural changes in the micelles.
科研通智能强力驱动
Strongly Powered by AbleSci AI