Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (10): 3144.doi: 10.7503/cjcu20210401

• Physical Chemistry • Previous Articles     Next Articles

Tunable Enantioselective Adsorption of the As⁃synthesized Mesoporous Silica Through Chiral Imprinting

SONG Wenyao1,2,3, ZHOU Zhanglang1,2, YANG Xinli1,2,4, CHEN Lan1,2(), GE Guanglu1,2()   

  1. 1.CAS Key Laboratory of Standardization and Measurement for Nanoscience,National Center for Nanoscience and Technology,Beijing 100190,China
    2.CAS Center for Excellence in Nanoscience,Beijing 100190,China
    3.Sino?Danish College,University of Chinese Academy of Sciences,Beijing 100049,China
    4.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2021-06-11 Online:2021-10-10 Published:2021-10-10
  • Contact: CHEN Lan,GE Guanglu E-mail:chenlan@nanoctr.cn;gegl@nanoctr.cn
  • Supported by:
    the National Key Research & Development Program of China(2016YFA0200904)

Abstract:

Chiral mesoporous silica(CMS) has unique chiral structure and good enantioselective adsorption properties, which can be used for the separation of racemic mixtures. The preparation and applications of the CMS have received many attentions in recent years, while less research has been conducted on the origin for the chiral selective adsorption of the CMS. In this work, CMS was prepared using chiral anionic surfactants as supramolecular templates assisted by co?structure directing method. The enantioselective adsorption of racemic molecules and chirality for the CMS were measured using circular dichroism(CD), and the effect of mesoporous surface modification with or without co?structure directing agent TMAPS(N?trimethoxysilylpropyl?N, N, N?trimethylammonium chloride) on the adsorption selectivity was compared. As a result, the as?synthesized CMS whose inner surface is grafted with TMAPS induced by supramolecular templates with opposite chirality can produce chiral imprinting with opposite helical arrangement and thus result in opposite adsorption selecti?vity. It has been confirmed that the enantioselective adsorption of the CMS for separating racemic mixtures is mainly caused by the chiral imprinting of TMAPS with helical arrangement grafted on the mesoporous surface. The chiral supramolecular templated TMAPS alignment to produce chiral imprinting is practical for some applications, which can in situ tune the enantioselective adsorption and separation property for the as?synthesized mesoporous materials. This work is thought to widen the applications of the CMS in many areas such as stereoselective recognition, asymmetric catalysis and drug delivery etc.

Key words: Chiral mesoporous silica, Chiral supramolecular template, Enantioselective adsorption, Chiral imprinting, co?Structure directing agent

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