Wang Cheng, Zhang Deqing, Xiang Junfeng, Zhu Daoben
Beijing National Laboratory for Molecular Sciences, Organic Solids Laboratory, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
Langmuir. 2007 Aug 28;23(18):9195-200. doi: 10.1021/la701142d. Epub 2007 Jul 6.
By coupling the features of anthracene and urea, a new low-molecular-weight gelator (LMWG, 1) with anthracene and urea moieties was designed and synthesized. A nontransparent gel of LMWG 1 in 1,2-dichloroethane was formed and characterized. Of particular interest is the observation of significant fluorescence enhancement after gelation, which is referred as to gelation-induced enhanced fluorescence emission. UV light irradiation of the THF solution of LMWG 1 yielded a photodimer with the h-t conformation. The photodimer can gel several organic solvents, including cyclohexane, n-hexane, and n-heptane. It should be mentioned that the gel based on the photodimer is rather stable. Our studies indicate that neither the gel phase based on LMWG 1 nor that based on the photodimer can be transformed to the solution by respective UV light irradiation or visible light irradiation/heating.
通过结合蒽和尿素的特性，设计并合成了一种具有蒽和尿素部分的新型低分子量凝胶剂（LMWG，1）。形成了LMWG 1在1,2 - 二氯乙烷中的不透明凝胶并进行了表征。特别有趣的是观察到凝胶化后显著的荧光增强，这被称为凝胶化诱导增强荧光发射。LMWG 1的四氢呋喃溶液经紫外光照射产生了具有h - t构象的光二聚体。该光二聚体可以使几种有机溶剂凝胶化，包括环己烷、正己烷和正庚烷。应该提到的是，基于光二聚体的凝胶相当稳定。我们的研究表明，基于LMWG 1的凝胶相和基于光二聚体的凝胶相都不能通过各自的紫外光照射或可见光照射/加热转化为溶液。
