New organogels based on an anthracene derivative with one urea group and its photodimer: fluorescence enhancement after gelation.
New organogels based on an anthracene derivative with one urea group and its photodimer: fluorescence enhancement after gelation.
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DOI：
10.1021/la701142d
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发表时间：
2007-07
期刊：
影响因子：
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通讯作者：
Cheng Wang;Deqing Zhang;J. Xiang;Daoben Zhu
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文献类型：
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作者：
Cheng Wang;Deqing Zhang;J. Xiang;Daoben Zhu
结合蒽和脲的性质，设计合成了一种含蒽和脲的新型低分子量胶凝剂（LMWG，1）。LMWG 1在1，2-二氯乙烷中形成不透明的凝胶并进行表征。特别感兴趣的是观察到凝胶化后显著的荧光增强，这被称为凝胶诱导的增强的荧光发射。紫外光照射LMWG 1的THF溶液产生具有h-t构象的光二聚体。光二聚体可以凝胶化几种有机溶剂，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，无论是基于LMWG 1的凝胶相还是基于光二聚体的凝胶相都不能通过相应的紫外光照射或可见光照射/加热转化为溶液。
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.