Wu Jia-Sheng, Liu Wei-Min, Zhuang Xiao-Qing, Wang Fang, Wang Peng-Fei, Tao Si-Lu, Zhang Xiao-Hong, Wu Shi-Kang, Lee Shuit-Tong
Nano-Organic Photoelectronic Laboratory, Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, PR China.
Org Lett. 2007 Jan 4;9(1):33-6. doi: 10.1021/ol062518z.
[reaction: see text] A new sensing mechanism based on C=N isomerization, which shows a very significant fluorescence enhancement to the metal cations in a simple and efficient way, is demonstrated. A coumarin derivative (L) containing a C=N group was designed as an example for illustration. The free ligand L is almost nonfluorescent due to the isomerization of C=N double bond in the excited state. However, the solution of ligand shows about a 200-fold increase of fluorescence quantum yield (about 30%) upon addition of Zn(ClO4)2.
[反应：见正文] 展示了一种基于C=N异构化的新型传感机制，该机制以简单有效的方式对金属阳离子表现出非常显著的荧光增强。设计了一种含C=N基团的香豆素衍生物（L）作为示例进行说明。由于激发态下C=N双键的异构化，游离配体L几乎不发荧光。然而，加入Zn(ClO4)2后，配体溶液的荧光量子产率增加了约200倍（约30%）。
