A core-shell nanocomposite is formed by co-assembly of an amphiphilic polymer and hydrophobically modified magnetic nanoparticles, with its core being a hydrophobically modified magnetic nanomaterial and its shell being the amphiphilic polymer, wherein hydrophilic segments in the amphiphilic polymer are located at an outermost layer of the shell. The above composite can be used as additives in the crystallization of conglomerates and obtain optically pure crystals of both enantiomers in a single process. The key thereof is that the composite is used to enrich molecules with the same configuration while inhibit the crystallization of the other enantiomer in a supersaturated solution of conglomerates, such that a non-magnetic crystal and a magnetic crystal (which are enantiomers of each other) are generated in a unit operation. Optically pure crystals of both enantiomers with over 90 ee % can be obtained by one-time crystallization, and the total yield can be as high as 40%.
一种核-壳纳米复合材料是由两性聚合物和疏
水修饰的磁性纳米颗粒共同组装而成,其核心是疏
水修饰的磁性纳米材料,其壳是两性聚合物,其中两性聚合物中的亲
水性段位于壳的最外层。上述复合材料可以用作在凝聚物的结晶中的添加剂,并在单个过程中获得两个对映异构体的光学纯晶体。其关键在于利用复合材料来富集具有相同构型的分子,同时抑制凝聚物的另一个对映异构体的结晶,在凝聚物的过饱和溶液中产生非磁性晶体和磁性晶体(它们彼此是对映异构体)的单元操作。一次结晶可以获得超过90%的光学纯度的两个对映异构体的纯晶体,总产率可以高达40%。