Single‐Layered Chiral Nanosheets with Dual Chiral Void Spaces for Highly Efficient Enantiomer Absorption

Although considerable effort in recent years has been devoted to the development of two‐dimensional nanostructures, single‐layered chiral sheet structures with a lateral assembly of discrete clusters remain elusive. Here, we report single‐layered chiral 2D sheet structures with dual chiral void spaces in which discrete clusters of planar aromatic segments are arranged with in‐plane AB order in aqueous methanol solution. The chirality of the sheet is induced by the slipped‐cofacial stacks of rectangular plate‐like aromatic segments in the discrete clusters which are arranged laterally with up and down packing, resulting in dual chiral void spaces. The chiral nanosheets function as superfast enantiomer separation nanomaterials, which rapidly absorb a single enantiomer from a racemic mixture with greater than 99 % ee. Being picky: Single‐layered chiral 2D sheet structures with dual chiral void spaces are formed in aqueous methanol solution from discrete clusters of planar aromatic segments with in‐plane up and down AB packing. The slipped cofacial stacks of aromatic segments induce the chirality of the sheet. The nanosheets absorb rapidly one enantiomer from a solution of the racemic mixture with greater than 99 % ee.