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Hollow Two-Layered Chiral Nanoparticles Consisting of Optically Active Helical Polymer/Silica: Preparation and Application for Enantioselective Crystallization

机译：光学活性螺旋聚合物/二氧化硅组成的中空两层手性纳米粒子：对映选择性结晶的制备和应用

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摘要

This article reports for the first time a novel category of hollow organic® inorganic hybrid two-layered nanoparticles (NPs), in which the inner layer is formed by optically active helical polyacetylene, and the outer layer by silica. Such NPs show remarkable optical activity and are successfully used for enantioselective crystallization. To prepare such NPs, n-butyl acrylate undergoes radical polymerization to first form poly(n-butyl acrylate) (PBA) cores two shells by catalytic polymerization of substituted acetylene and sol-gel approach of TEOS (tetraethyl orthosilicate), respectively. Removal of the PBA cores provides the expected hollow core/shell NPs. The intense dircular dichroism (CD) effects demonstrate that the hollow chiral NPs possess considerable optical activity, arising from the helical substituted polyacetylenes forming the inner layer. The hollow NPs are further used as chiral templates to induce enantioselective crystallization of racemic alanines, demonstrating the significant potential applications of the hollow chiral NPs in chiral technologies. Also of particular significance is the detailed process of the induced crystallization observed by TEM. The strategy for preparing the hollow hybrid chiral NPs should be highlighted since it combines free radical polymerization and catalytic polymerization with sol-gel process in a single system, by which numerous advanced materials will be accessible.
机译：本文首次报道了一种新型的中空有机无机杂化两层纳米颗粒（NPs），其中内层由旋光螺旋聚乙炔形成，外层由二氧化硅形成。这样的NP显示出显着的光学活性，并成功用于对映选择性结晶。为了制备这种NP，丙烯酸正丁酯进行自由基聚合以首先通过取代的乙炔的催化聚合和TEOS（原硅酸四乙酯）的溶胶-凝胶法分别形成两个壳的聚丙烯酸正丁酯（PBA）核。去除PBA核心可提供预期的空心核/壳NP。强烈的二向色性（CD）效应表明，中空手性NP具有很强的光学活性，这是由形成内层的螺旋取代的聚乙炔引起的。空心NP被进一步用作手性模板以诱导外消旋丙氨酸的对映选择性结晶，证明了空心手NP在手性技术中的巨大潜在应用。 TEM观察到的诱导结晶的详细过程也具有特别的意义。应该强调制备空心杂化手性NP的策略，因为它将自由基聚合和催化聚合与溶胶-凝胶法结合在一个单一的系统中，通过该系统可以得到许多先进的材料。

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  • 来源
    《Advanced Functional Materials》 |2011年第12期|p.2345-2350|共6页
  • 作者

    Bo Chen; Jicmping Deng; Wantai Yang;

  • 作者单位

    State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029, P. R. China College of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029, P. R. China;

    State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029, P. R. China College of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029, P. R. China;

    State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029, P. R. China College of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029, P. R. China;

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