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
中科院分区:
文献类型:
--
作者:
Lai, Yi;Wan, Decheng;Jin, Ming;Pu, Hongting
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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