Cooperative Entrapment of Xanthene Dyes by a Core-Engineered Unimolecular Micelle

Cooperative Entrapment of Xanthene Dyes by a Core-Engineered Unimolecular Micelle
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核心设计的单分子胶束协同捕获呫吨染料

DOI:
10.1002/macp.201300221
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发表时间:
2013-08
影响因子:
2.5
通讯作者:
Pu, Hongting
Pu, Hongting
中科院分区:
化学4区
文献类型:
--
作者:
Lai, Yi;Wan, Decheng;Jin, Ming;Pu, Hongting

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指定访客的协作捕获仅适用于明确定义的主机。据报道,共同的主人对客人进行合作诱捕。环氧聚乙二醇单甲醚 (PEG1) 对超支化聚乙烯亚胺 (PEI) 进行烷基化,生成水溶性 PEI@PEG1 (H1)。 H1的多功能核心被修饰成H2–H4,具有不同的极性和离子电荷。H1–H4以单分子胶束形式存在,可以有效地捕获玫瑰红(RB)或曙红Y(EY)染料。实验表明客体染料仅容纳在 H1-H4 的核心中。封装以协作方式进行,如希尔方程 (n> 1) 分析。研究发现,协同作用源于封装后染料增强的π-π堆积,并且极性和离子环境有利于协同作用。这是由共同主机实现合作诱捕的第一个例子。
The cooperative entrapment of a specified guest is only available for a well‐defined host. Here it is reported that a common host conducts cooperative entrapment of guests. Alkylation of a hyperbranched polyethylenimine (PEI) by epoxy poly(ethylene glycol) monomethyl ethers (PEG1) leads to a water‐soluble PEI@PEG1 (H1). The multifunctional core ofH1is modified to result inH2–H4,with different polarities and ionic charges.H1–H4exist as unimolecular micelles, and can effectively entrap dyes of rose bengal (RB) or eosin Y (EY). Experiments indicate that the guest dyes are exclusively accommodated in the cores ofH1–H4. The encapsulation proceeds in a cooperative manner, as analysis by the Hill equation (n> 1). It is found that the cooperativity stems from the enhanced π–π stacking of the dyes upon encapsulation, and a polar and ionic environment favors the cooperativity. This is the first example of a cooperative entrapment being realized by a common host.
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