文献类型：期刊文献

英文题名：Enhancing photostability of cyanine dye by cucurbituril encapsulation

作者：Zhang, Hongyuan;Liu, Lele;Gao, Chao;Sun, Ruyi;Wang, Qiaochun[1]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：2012

卷号：94

期号：2

起止页码：266

外文期刊名：DYES AND PIGMENTS

收录：;EI(收录号：20121114852321);WOS:【SCI-EXPANDED(收录号:WOS:000302982200014)】；

基金：This work is financially supported by the NSFC/China (21072058), National Basic Research 973 Program (2011CB808400), and the Foundation for the Author of National Excellent Doctoral Dissertation of PR China (200758).

语种：英文

外文关键词：Pseudorotaxane; Cucurbituril; Cyanine dye; Photostability; Inclusion complex; Supramolecular chemistry

摘要：A linear cyanine dye (LDP) guest comprising two binding sites, one 4-[2-[4-(dimethylamino)phenyl]ethenyl]pyridinium group and one p-aminophenoxy ethylene group, was synthesized and proved could form inclusion complexes with cucurbit[7]uril (CB[7]) in aqueous solution. A partially encapsulated ([2]pseudorotaxane) state in which one CB[7] ring moved fast between the two binding sites was originally detected and was then transferred into a full encapsulated ([3]pseudorotaxane) state where two CB[7] macrocycles resided on both binding sites with the continuously adding of CB[7] to LDP. The two binding constants K-1 and K-2 were determined as (6.29 +/- 0.88) x 10(4) M-1 and (1.58 +/- 0.17) x 10(4) M-1, respectively. Compared with the free LDP, the photostability of the [3]pseudorotaxane is found been distinctively promoted, while that of the [2]pseudorotaxane state is hardly improved. (C) 2012 Elsevier Ltd. All rights reserved.