Chiral ionic organic single-crystal and its exfoliated two-dimensional nanosheets with enhanced enantioseparation
Huifeng Liu1,2, Yongrui He3, Jia Chen1
1Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences Lanzhou 730000 China jiachen@licp.cas.cn.
Abstract:
A chiral ionic organic single-crystal (CIOC) was prepared for the first time through ionic self-assembly using bipyridium chiral ionic liquid (CIL) and 4,4'-biphenyldisulfonic acid (BDA). The CIOC can be ultrasonically exfoliated to produce two-dimensional nanosheets (2D-NSs). The 2D-NSs presented enhanced enantioseparation compared to the CIOC and CIL when used as gas chromatography stationary phase, which may be due to the exfoliated 2D-NSs exhibiting greater exposure of functional groups. Additionally, better resolution of other organic compounds such as positional isomers, n-alkanes and n-alkanols, Grob mixture, phenols and anilines was obtained in 2D-NSs than CIOC and CIL. This work not only provides a reference for the preparation of chiral ionic organic single-crystals and two-dimensional nanosheets for chiral separation, but also stimulates the preparation of such new ionic organic single-crystals via self-assembly for other potential applications.
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