Most synthetic building blocks self-assemble into one- or three-dimensional architectures. However, fewer examples have been reported on the aggregation of amphiphiles to form optically-active two-dimensional (2D) structures. Herein, we report the self-assembly of tetraphenylethylene (TPE)-containing hydrophilic dendrons into 2D sheet structures in aqueous methanol solution. TEM and AFM investigations showed that the self-assembly of disubstituted TPE generates helical nanofibers as an intermediate structure which, in turn, laterally associate into a chiral sheet structure with a thickness of 4.6 nm, whereas tetrasubstituted TPE self-assembles into a nonchiral sheet structure with a thickness of 3.8 nm. In great contrast to the nonchiral sheets, the chiral sheets are able to preferentially absorb the d-enantiomer in a racemic phenylalanine derivative solution accompanied by fluorescence enhancement, thus indicating that the single-layered chiral sheets act as an enantioselective membrane that can be used for fluorescence sensing.

中文翻译：

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四苯乙烯基两亲物在甲醇水溶液中的自组装成二维手性片，用于对映选择性吸附。

大多数合成构建块会自动组装为一维或三维结构。然而，关于两亲物的聚集以形成光学活性的二维（2D）结构的报道较少。在这里，我们报告了含四苯乙烯（TPE）的亲水树枝状分子在甲醇水溶液中的自组装成二维片状结构。TEM和AFM研究表明，双取代TPE的自组装产生了螺旋纳米纤维，作为中间结构，而后者又横向结合成厚度为4.6 nm的手性片结构，而四取代的TPE自组装成非手性片结构厚度为3.8 nm。与非手性片材形成鲜明对比的是，