文献类型：期刊文献

英文题名：Aggregation and host-guest interactions in dansyl-substituted poly(acrylate)s in the presence of β-cyclodextrin and a β-cyclodextrin dimer in aqueous solution: A UV-vis, fluorescence, 1H NMR, and rheological study

作者：Wang, Jie[1]; Pham, Duc-Truc[2]; Kee, Tak W.[2]; Clafton, Scott N.[2]; Guo, Xuhong[1]; Clements, Philip[2]; Lincoln, Stephen F.[2]; Prud'homme, Robert K.[3]; Easton, Christopher J.[4]

机构：[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; [2] School of Chemistry and Physics, University of Adelaide, Adelaide, SA 5005, Australia; [3] Department of Chemical Engineering, Princeton University, Princeton, NJ 08544, United States; [4] Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia

年份：2011

卷号：44

期号：24

起止页码：9782

外文期刊名：Macromolecules

收录：EI(收录号：20115214643863)

语种：英文

外文关键词：Sodium chloride - Cyclodextrins - Sulfur compounds - Fluorescence quenching - Solutions - Complexation - Urea

摘要：A UV-vis, steady-state, and time-resolved fluorescence 2D 1H NOESY NMR spectroscopic and rheological study of new poly(acrylate)s 3% randomly substituted with either N-(2-aminoethyl)-, N-(6-aminohexyl)-, or N-(12-aminododecyl)-5-dansyl-sulfonamide to give the substituted polymers PAADSen, PAADShn, and PAADSddn, respectively, is reported. Their dansyl substituent aggregation and complexation by β-cyclodextrin, βCD, and its covalently linked dimer N,N′-bis(6A-deoxy-6 A-β-cyclodextrin)urea, 66βCD2ur, is also reported. The βCD complexation of the dansyl substituents is characterized by apparent complexation constants, K = 89, 105, and 55 dm3 mol -1 for PAADSen, PAADShn, and PAADSddn, respectively, and the analogous complexations by 66βCD2ur are characterized by K = 3.04 × 103, 3.42 × 104, and 2.42 × 105 dm3 mol-1 at pH 7.0 in aqueous 0.10 mol dm-3 NaCl at 298.2 K. Under the same conditions the dansyl substituent shows three fluorescence decay constants assigned to the aggregated (τ1 = 2.2, 2.5, and 3.2 ns), single (τ2 = 5.0, 5.3, and 9.5 ns), βCD (τ3 = 13.2, 11.7 ns, and undetected), and 66βCD2ur complexed dansyl substituent states (τ3 = 13.9, 20.8, and 19.3 ns) where the values in each data set correspond to PAADSen, PAADShn, and PAAddn solutions, respectively. 2D 1H NOESY NMR spectroscopy provides additional insight into dansyl substituent complexation by βCD and 66βCD2ur, as do rheological studies. These data are interpreted in terms of the factors affecting dansyl substituent fluorescence quenching and the impact of tether length on dansyl substituent aggregation, complexation, and network formation. ? 2011 American Chemical Society.