主客体组装诱导圆偏振发射金纳米簇的构建

圆偏振发光是一种具有手性性质的发光现象，在近年来已成为有机以及纳米光功能材料研究的一个新方向。作为一种新兴的纳米发光材料，金纳米簇具有精确的原子组成，是一种极具潜力的纳米发光材料。然而，受制于较低的发光量子产率以及绝大多数金纳米簇缺少手性结构，有关金纳米簇圆偏振发光方面的研究还比较匮乏。本项目书中，我们通过对多肽为配体的金纳米簇进行表面修饰，以主客体组装为手段将有机手性发光分子固定于金纳米簇的表面配体上，首次研究有机发光分子与无机金纳米簇金核之间的手性能量转移作用，并且通过主客体组装对这一能量转移作用进行调控以构建具有发光量产以及不对称因子双重增强效应的手性发光金纳米簇。本项目不仅进一步拓展了主客体组装在亚纳米尺度上的构建和调控功能，同时手性能量转移的策略在构筑其他圆偏振发光纳米材料方面上也可提供借鉴意义。

Circularly polarized luminescence (CPL) is a emitting phenomenon with chiral properties, which has become an emerging direction in the research of organic and nano-optical functional materials in recent years. As a new kind of emitting nanoparticles with precise atomic composition, gold nanoclusters have shown a great potential in luminescent materials. However, due to the low luminescence quantum yield and the lack of chiral structure in most gold nanoclusters, the research on CPL from gold nanoclusters is still relatively scarce. In this project, we plan to anchor organic fluorophores with CPL properties at the surface peptide ligands on gold nanoclusters via host-guest assembly. By this method, it is the first time to study the chiral energy transfer between organic fluorescent molecules and the Au cores of gold nanoclusters, and fabricate tunnable CPL-emitting gold nanoclusters mediated by host-guest assembly. We believe that this project can not only further expand the utilization and regulation of the host-guest assembly on the sub-nanometer scale, but also provide a great reference significance for the fabrication of other nanomaterials with CPL property.