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首页> 外文期刊>RSC Advances >Optically active helical polyacetylene/Fe3O4 composite microspheres: prepared by precipitation polymerization and used for enantioselective crystallization
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Optically active helical polyacetylene/Fe3O4 composite microspheres: prepared by precipitation polymerization and used for enantioselective crystallization

机译：旋光螺旋聚乙炔/ Fe3O4复合微球：通过沉淀聚合制备并用于对映选择性结晶

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摘要

This article reports the first coordination-precipitation polymerizations for preparing chiral, magnetic composite microspheres consisting of helical substituted polyacetylene and Fe3O4 nanoparticles. The microspheres were obtained in high yield (>85%) and characterized by XRD, FT-IR, SEM, TEM, CD and UV-vis absorption techniques. TEM and SEM images showed that the microspheres were approx. 600 nm in average diameter and possessed a spherical morphology with a rough surface. CD and UV-vis absorption spectra demonstrated that the polyacetylene chains constructing the microspheres adopted helical structures of a predominantly one handed screw nature, which enabled the microspheres to show remarkable optical activity. The microspheres also performed desirable magneticity. They were further used as chiral selectors efficiently inducing enantioselective crystallization of D-and L-alanine as model chiral enantiomers. Moreover, the microspheres can be easily restored under the assistance of an external magnetic field. The coordination-precipitation polymerizations provide a versatile platform for preparing advanced chiral and non-chiral, magnetic hybrid microspheres.
机译：本文报道了用于制备由螺旋取代的聚乙炔和Fe3O4纳米粒子组成的手性磁性复合微球的首个配位沉淀聚合反应。以高产率（> 85％）获得微球，并通过XRD，FT-IR，SEM，TEM，CD和UV-vis吸收技术表征。 TEM和SEM图像表明，微球约为0。平均直径600nm，具有粗糙表面的球形。 CD和UV-vis吸收光谱表明，构成微球的聚乙炔链采用主要是单手螺旋性质的螺旋结构，这使微球显示出显着的光学活性。微球还具有理想的磁性。它们还被用作手性选择剂，可有效地诱导D-和L-丙氨酸作为模型手性对映异构体的对映选择性结晶。此外，微球可以在外部磁场的帮助下容易地恢复。配位沉淀聚合为制备高级手性和非手性磁性杂化微球提供了多功能平台。

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