A “breathing” dendritic molecule—conformational fluctuation induced by external stimuli

文献信息

发布日期 2014-07-07

DOI 10.1039/C4PY00714J

影响因子 5.582

作者

Yi Zeng, Peng Li, Xinyang Liu, Tianjun Yu, Jinping Chen, Guoqiang Yang, Yi Li

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摘要

A series of PAMAM dendrimers peripherally modified with tetraphenylethylene (TPE), a typical chromophore with emission enhancement in aggregate, were synthesized (D0–D4). The dendrimers are molecularly dissolved in toluene, a selective solvent. The intramolecular rotation of TPE is depressed by the restrained conformation caused by the congested packing periphery in higher generation dendrimers (D2–D4), which results in a remarkable emission enhancement. The fluorescence quantum yield increases more than 10-fold in D3 and D4 dendrimers compared with a model compound. Furthermore, the emission intensity of dendrimers can be tuned by changing the temperature or solvent conditions, which alters the conformational confinement. Unimolecular spheres with multiple chromophores and conformation-controlled emission are reminiscent of proteins with modulated sizes and photofunctions. Developing these dendritic systems will promote the research of multi-functionalized chromophores and lead to their potential applications in biomimics and sensors.

期刊推荐

Journal of Natural Medicines

Russian Journal of Organic Chemistry

Saudi Pharmaceutical Journal

Organic Process Research & Development

New Journal of Chemistry

Russian Journal of Coordination Chemistry

Nature Medicine

Current Opinion in Solid State & Materials Science

Journal of Saudi Chemical Society

Crystallography Reports

来源期刊

Polymer Chemistry

CiteScore: 8.6

自引率: 7.3%

年发文量: 457

Polymer Chemistry welcomes submissions in all areas of polymer science that have a strong focus on macromolecular chemistry. Manuscripts may cover a broad range of fields, yet no direct application focus is required.

A “breathing” dendritic molecule—conformational fluctuation induced by external stimuli

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