Study on the extent of folding back conformation in poly(aryl ether) dendrimers by intramolecular electron transfer and exciplex formation

doi:10.1021/ma071901w

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	Study on the extent of folding back conformation in poly(aryl ether) dendrimers by intramolecular electron transfer and exciplex formation
	Li, Ying-Ying 1,2; Han, Lei 1,2; Chen, Jinping 1; Zheng, Shaojun 1,2; Zen, Yi 1; Li, Yi 1; Li, Shayu 3; Yang, Guoqiang 3
刊名	MACROMOLECULES
	2007-12-25
卷号	40 期号:26 页码:9384-9390
ISSN号	0024-9297
DOI	10.1021/ma071901w
英文摘要	A series of poly(aryl ether) dendrimers (Py-Gn-NHPh, n = 1-4) with only one pyrene chromophore at the periphery and an aniline group at the core were synthesized and the extent of folding back conformation was given by the intramolecular electron transfer and exciplex formation. Selective excitation of the periphery Py-Gn-NHPh in dichloromethane resulted in an electron-transfer process from. pyrene moiety of aniline to pyrene, and as a consequence of the electron transfer, an intramolecular exciplex was formed. Since the exciplex formation requires a direct orbital overlap between the donor and the acceptor groups, this gives us a direct experimental observation for the folding back conformation of poly(aryl ether) dendrimers. The efficiencies and the rate constants of electron transfer in dichloromethane are measured to be 0.90, 0.83 0.78, 0.68, and 3.6 x 10(s), 1.7 x 10(8), 1.2 x 10(8), and 6.6 x 10(7) s(-1) for generations 1-4, respectively. The separations (center to center) between the core donor group and the periphery acceptor chromophore are estimated from the rate constants of electron transfer, which are 7.7. 8.0, 8.2, and 8.5 A for generations 1-4, respectively. This means that the periphery chromophores can fold inward and reach to the core vicinity for all four generations.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000251724700026
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/62475]
专题	中国科学院化学研究所
通讯作者	Li, Yi
作者单位	1.Chinese Acad Sci, Lab Organ Optoelect Funct Mat & Mol Engn, Tech Inst Phys & Chem, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 3.Chinese Acad Sci, Inst Chem, Key Lab Photochem, BNLMS, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Li, Ying-Ying,Han, Lei,Chen, Jinping,et al. Study on the extent of folding back conformation in poly(aryl ether) dendrimers by intramolecular electron transfer and exciplex formation[J]. MACROMOLECULES,2007,40(26):9384-9390.
APA	Li, Ying-Ying.,Han, Lei.,Chen, Jinping.,Zheng, Shaojun.,Zen, Yi.,...&Yang, Guoqiang.(2007).Study on the extent of folding back conformation in poly(aryl ether) dendrimers by intramolecular electron transfer and exciplex formation.MACROMOLECULES,40(26),9384-9390.
MLA	Li, Ying-Ying,et al."Study on the extent of folding back conformation in poly(aryl ether) dendrimers by intramolecular electron transfer and exciplex formation".MACROMOLECULES 40.26(2007):9384-9390.