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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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聚阳离子糖缀物氢键诱导TPPS手性聚集
DOI: 10.11777/j.issn1000-3304.2014.14029, PP. 1378-1385
Keywords: 自组装,超分子手性,J-聚集,氢键
Abstract:
利用原子转移自由基聚合(ATRP)方法制备了亲水性嵌段聚合物聚乙二醇-b-聚甲基丙烯酸N,N-二甲氨基乙酯(PEG-b-PDMAEMA),并通过季铵化反应,得到侧链接枝不同单糖分子(葡萄糖、半乳糖、甘露糖)的聚阳离子糖缀物PEG-b-P(DMAEMA-co-DMAEMA-Sac)(Monosaccharide).研究了该聚合物与5,10,15,20-四(对磺酸基苯基)-卟啉(TPPS)在水溶液中的复合自组装行为.研究结果表明,TPPS在该组装体中以J-聚集体形式存在且显示超分子手性特征.手性信号的产生是聚合物侧链糖单元C(4)和C(5)上的羟基与TPPS通过非共价键——氢键相互作用的结果,因此手性信号方向应与糖单元构型有关.通过对比单糖构型发现,具有(4S,5R)构型的糖单元可诱导TPPS产生424nm正Cotton效应和490nm负Cotton效应的聚集体,具有(4R,5R)构型的糖单元可诱导TPPS产生424nm负Cotton效应和490nm正Cotton效应的聚集体.
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