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Impact of cyclic topology: odd–even glass transition temperatures and fluorescence quantum yields in molecularly-defined macrocycles

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Abstract

Topological molecular architectures play a crucial role in many physico-chemical properties of materials and biological processes. Herein we synthesized a series of molecularly-defined cyclic oligomers, cyclic-TPEn+1 (n = 1–6), containing tetraphenylethylene (TPE) segments in the main chain by a stepwise chain-growth strategy. The cyclic structure endows the cyclic-TPEn+1 with a higher glass transition temperature (Tg) and quantum yields of aggregation induced emission (AIE) for n = 1 and 2 due to the constraints imposed by the cyclic topology itself. Importantly, the cyclic topology induces odd–even effects on both Tg and photoluminescence quantum yield, arising from the alternation of intermolecular interactions. Hopefully, this work will advance our understanding on the glass transition and AIE mechanism, and finally pave the way for the development of luminogens with a wide variety of functions.

Graphical abstract: Impact of cyclic topology: odd–even glass transition temperatures and fluorescence quantum yields in molecularly-defined macrocycles

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Publication details

The article was received on 09 Jan 2017, accepted on 01 Apr 2017 and first published on 03 Apr 2017


Article type: Paper
DOI: 10.1039/C7PY00037E
Citation: Polym. Chem., 2017, Advance Article
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    Impact of cyclic topology: odd–even glass transition temperatures and fluorescence quantum yields in molecularly-defined macrocycles

    K. Li, G. Jiang, F. Zhou, L. Li, Z. Zhang, Z. Hu, N. Zhou and X. Zhu, Polym. Chem., 2017, Advance Article , DOI: 10.1039/C7PY00037E

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