Cited by 22Dendrimers and Hyperbranched PolymersLuminescence and Fluorescent MaterialsSupramolecular Chemistry and Complexes

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

Zeng, Yi, Li, Peng, Liu, Xinyang, Yu, Tianjun, Chen, Jinping, Yang, Guoqiang, Li, Yi·2014·Polym. Chem.

Abstract

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.

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Crossref · 10.1039/c4py00714j

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Authors
Zeng, Y., Li, P., Liu, X., Yu, T., Chen, J., Yang, G., & Li, Y.
Affiliations
Chinese Academy of Sciences (CN)
Corresponding author
  • Zeng, Yi
  • Yang, Guoqiang
  • Li, Yi
Venue
Polym. Chem.
Published
2014-07-07
Volume
5
Issue
20
Pages
5978-5984
ISSN
  • 1759-9954 (ISSN-L)
  • 1759-9962
OpenAlex
W2066961248
Cited by
22
References
50
Citations by year
2024: 1 · 2022: 1 · 2021: 4 · 2020: 4 · 2019: 3 · 2018: 3 · 2017: 2 · 2016: 1 · 2015: 3
FWCI
1.40
Type
journal article
Language
en
Open access
closed
Locations
Polymer Chemistry (publishedVersion)
Funders
  • National Natural Science Foundation of China
  • Chinese Academy of Sciences
  • National Key Research and Development Program of China
Topics
  • Physical Sciences › Materials Science › Polymers and Plastics › Dendrimers and Hyperbranched Polymers
  • Physical Sciences › Materials Science › Materials Chemistry › Luminescence and Fluorescent Materials
  • Physical Sciences › Chemistry › Organic Chemistry › Supramolecular Chemistry and Complexes
Keywords
PAMAM dendrimers, tetraphenylethylene, internal rotation, fluorescence enhancement, aggregation-induced emission, temperature-dependent emission, solvent-dependent emission, dendrimer generation, biomimetic systems, sensors

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