文献类型：期刊文献

英文题名：Effects of anionic surfactant SDS on the photophysical properties of two fluorescent molecular sensors

作者：Qian, Junhong;Xu, Yufang;Qian, Xuhong[1];Wang, Jiaobing;Zhang, Shenyi

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Shanghai Key Lab Chem Biol, Sch Pharm, Shanghai 200237, Peoples R China

年份：2008

卷号：200

期号：2-3

起止页码：402

外文期刊名：JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY

收录：;EI(收录号：20241015685667);WOS:【SCI-EXPANDED(收录号:WOS:000261839600040)】；

基金：This work was financially supported by the National Natural Science Foundation of China (20536010), the National Key Project for Basic Research (2003CB 114400) and the Science and Technology Foundation of Shanghai.

语种：英文

外文关键词：Fluorescent sensor; Micelle; Premicelle; SDS

摘要：Two fluorescent molecular sensors CS1 and CS2 were designed and synthesized to probe the aggregate behavior of anionic surfactant SDS. CS1 was based on the photo-induced electron transfer (PET) mechanism, while CS2 was founded on the intramolecular charge transfer (ICT) mechanism. The photophysical properties of CS1-2 in anionic surfactant sodium dodecyl sulfate (SDS) solution were studied by fluorescence and UV-vis methods. The experimental results show that significant absorption and emission spectral responses of CS1 were observed with the addition of SIDS: the absorbance and fluorescence intensity decreased first and then increased. The plot of fluorescence intensity of CS1 versus SDS concentration showed two break points, which might be ascribed to the critical micellar concentration (cmc) and the formation of premicelle (cac) aggregate, respectively. But the solution's color of CS2 changed from yellow to red with increasing SDS concentrations. The large red-shift in both absorption (50 nm) and emission (55 nm) spectra of CS2 was resulted from the protonation of the electron accepting moiety (N=C nitrogen), which enhanced the "push-pull" interaction of the ICT fluorophore. This was facilitated by the increase of local H-center dot concentration around SIDS premicelle and micelle. As a consequence, pK(a) values of CS1 and CS2 were elevated in SDS micelle. (C) 2008 Elsevier B.V. All rights reserved.