QQ客服 官方微博 反馈留言

	Conversion of intramolecular singlet electron transfer at room temperature into triplet energy transfer at 77 k: photoisomerization in norbornadiene- and carbazole-labeled poly(aryl ether) dendrimers
	Chen, J; Chen, JP; Li, SY; Zhang, L; Yang, GQ; Li, Y
刊名	Journal of physical chemistry b
	2006-03-16
卷号	110期号:10页码:4663-4670
ISSN号	1520-6106
DOI	10.1021/jp057002w
通讯作者	Yang, gq()
英文摘要	A series of frechet-type poly(aryl ether) dendrimers (cz-gn-nbd, n = 1-3) with carbazole (cz) chromophores and a norbornadiene (nbd) group attached to the periphery and the core, respectively, were synthesized, and their photophysical and photochemical properties were investigated. selective excitation of the carbazole units in cz-gn-nbd resulted in a singlet electron transfer from cz to nbd at room temperature, and an intersystem crossing followed a triplet-triplet energy transfer from cz to nbd in glassy 2-methyltetrahydrofuran at 77 k. both singlet electron transfer and triplet energy transfer processes lead to the isomerization of the norbornadiene group into the quadricyclane (cz-gn-qc). the efficiencies and the rate constants for singlet electron transfer are approximately 88, 80, and 74% and 1.8 x 10(9), 6.1 x 10(8), and 4.0 x 10(8) s(-1) for generations 1-3, respectively. the quantum yields of the intramolecular photosensitized isomerization are measured to be approximately 0.013, 0.012, and 0.011, and the efficiencies of triplet norbornadiene formation via singlet electron transfer are approximately 0.070, 0.065, and 0.059 for generations 1-3, respectively. the light-harvesting ability of cz-gn-nbd increases with the generation due to an increase of the number of peripheral chromophores. in glassy 2-methyltetrahydrofuran at 77 k, the triplet-triplet energy transfer proceeds with efficiencies of approximately 0.86, 0.64, and 0.36 and rate constants of 0.96, 0.25. and 0.08 s(-1) for generations 1-3, respectively. the intramolecular singlet electron transfer and triplet energy transfer in cz-gn-nbd proceed mainly via a through-space mechanism involving the proximate donor (folding back conformation) and acceptor groups.
WOS关键词	DENDRITIC MACROMOLECULES ; SITE-ISOLATION ; ELECTROCHEMICAL-BEHAVIOR ; PHOTOCHEMICAL REACTIONS ; MOLECULAR ARCHITECTURE ; POLY(AMIDE) DENDRIMERS ; LASER PHOTOCHEMISTRY ; CONVERGENT APPROACH ; SOLVENT DEPENDENCE ; PERIPHERAL GROUPS
WOS研究方向	Chemistry
WOS类目	Chemistry, Physical
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000236077600028
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2379587
专题	中国科学院大学
通讯作者	Yang, GQ
作者单位	1.Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Inst Chem, Key Lab Photochem, Beijing 100080, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Chen, J,Chen, JP,Li, SY,et al. Conversion of intramolecular singlet electron transfer at room temperature into triplet energy transfer at 77 k: photoisomerization in norbornadiene- and carbazole-labeled poly(aryl ether) dendrimers[J]. Journal of physical chemistry b,2006,110(10):4663-4670.
APA	Chen, J,Chen, JP,Li, SY,Zhang, L,Yang, GQ,&Li, Y.(2006).Conversion of intramolecular singlet electron transfer at room temperature into triplet energy transfer at 77 k: photoisomerization in norbornadiene- and carbazole-labeled poly(aryl ether) dendrimers.Journal of physical chemistry b,110(10),4663-4670.
MLA	Chen, J,et al."Conversion of intramolecular singlet electron transfer at room temperature into triplet energy transfer at 77 k: photoisomerization in norbornadiene- and carbazole-labeled poly(aryl ether) dendrimers".Journal of physical chemistry b 110.10(2006):4663-4670.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。