J- and H-Aggregates of 5,10,15,20-Tetrakis-(4-sulfonatophenyl)-porphyrin and Interconversion in PEG-b-P4VP Micelles

被引:70
|
作者
Zhao, Lizhi
Ma, Rujiang
Li, Junbo
Li, Yan
An, Yingli
Shi, Linqi [1 ]
机构
[1] Nankai Univ, Key Lab Funct Polymer Mat, Minist Educ, Tianjin 300071, Peoples R China
基金
中国国家自然科学基金;
关键词
D O I
10.1021/bm8004808
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Micellization of poly(ethylene glycol)-block-poly(4-vinylpyridine) (PEG(114)-b-P4VP(61)) induced by 5,10,15,20-tetrakis-(4-sulfonatophenyl)-porphyrin (TPPS) in acidic solutions were studied by dynamic and static light scattering, atomic force microscope, and UV-vis spectroscopy. The resultant complex micelles had a core-shell structure with the electrostatically complex TPPS/P4VP as the core and the soluble PEG as the shell. The anionic TPPS in the micellar core formed J-aggregates at pH 1.5-2.5 and H-aggregates at pH 3.0-4.0, respectively. Interconversion between the J-aggregates and the H-aggregates was carried out by adjusting the pH value of the micelle solutions. It is worth noting that the micelles showed strong split Cotton effect in the circular dichroism spectra although TPPS and the copolymer were all achiral. The resulting chirality sign could be selected by the hydrodynamic forces of a stirring vortex. Positive or negative chiral signals appeared when stirring clockwise or anticlockwise.
引用
收藏
页码:2601 / 2608
页数:8
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