Intramolecular Exciplex Formation Induced by the Folding-Back Conformation of Poly(aryl ether) Dendrimers†
Intramolecular Exciplex Formation Induced by the Folding-Back Conformation of Poly(aryl ether) Dendrimers†
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DOI：
10.1021/jp9004554
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发表时间：
2009-03
影响因子：
3.7
通讯作者：
Ming Li;Yingying Li;Yi Zeng;Jinping Chen;Yi Li
中科院分区：
文献类型：
--
作者：
Ming Li;Yingying Li;Yi Zeng;Jinping Chen;Yi Li
合成了一系列含有萘基核心基团的聚（芳基醚）树枝状聚合物 Gn-NA（n = 1−4），第 1−4 代。稳态和时间分辨荧光研究表明，Gn-NA (n = 1, 2) 具有松散的结构，Gn-NA (n = 3, 4) 具有更密集的结构，它们在二氯甲烷中经历从树枝状主链到萘基的单线态电子转移过程。作为电子转移过程的结果，在 G3-NA 和 G4-NA 中的核心萘基发色团和树突主链的苄氧基单元之间形成分子内激基复合物。二氯甲烷-乙腈二元溶剂中的荧光测量验证了树枝状聚合物的折叠构象可以增强分子内激基复合物的形成。
A series of poly(aryl ether) dendrimers Gn-NA (n = 1−4), generations 1−4, containing a naphthyl core group were synthesized. The steady-state and time-resolved fluorescence studies reveal that Gn-NA (n = 1, 2) take a loose structure and Gn-NA (n = 3, 4) bear a more congested structure, which undergo the singlet electron transfer process in dichloromethane from dendritic backbone to the naphthyl group. As a consequence of the electron transfer process, an intramolecular exciplex is formed between the core naphthyl chromophore and the benzyloxy unit of dendritic backbone in G3-NA and G4-NA. Fluorescence measurements in the dichloromethane−acetonitrile binary solvents validate that the intramolecular exciplex formation can be enhanced by the folding back conformation of dendrimers.