中国科学院化学研究所刘鸣华团队合成出新型二维手性聚轮烷单层材料。相关论文于2021年11月23日在线发表在《德国应用化学》杂志上。

研究人员提出了一种机械联锁的策略，通过利用β-环糊精作为手性轮和发光的动态共价有机框架作为二维聚合物轴，实现了二维手性聚糖（2D CPR）单层的出现和可导向的CPL活性。这种方法整合了主客体和动态共价化学，能够直接构建具有超大尺寸（达几十微米）的分层二维CPR单层，并同时赋予扩展的二维CPR网络手性来产生CPL活性。重要的是，二维CPR网络的结构和CPL性能不仅可以通过β-环糊精的加入量进一步调节。

这项工作首次展示了具有CPL活性的单层二维CPR。对诱导CPL的结构-性能关系的深入研究，将有助于深入理解二维手性纳米材料的激发态手性。

附：英文原文

Title: Two-dimensional Chiral Polyrotaxane Monolayer with Emergent and Steerable Circularly Polarized Luminescence

Author: Liangyu Hu, Xuefeng Zhu, Chenchen Yang, Minghua Liu

Issue&Volume: 2021-11-23

Abstract: Here, we propose a mechanically interlocked strategy to achieve 2D chiral polyrotaxane (2D  CPR  ) monolayer with emergent and steerable CPL activity by utilizing β-cyclodextrin as the chiral wheel and a luminescent dynamic covalent organic framework as 2D polymeric axle. Such methodology, integrating the host-guest and dynamic covalent chemistry, enabled the direct construction of delaminated 2D  CPR  monolayer with extraordinarily large size (up to tens of micrometers) and simultaneously endowed chirality to the extended 2D  CPR  network to generate CPL activity. Importantly, not only the structure but also the CPL performance of 2D  CPR  network can be further regulated by the feeding amount of β-cyclodextrin. This work demonstrated a monolayered 2D  CPR  with CPL activity for the first time. The insightful structure-property relationship on the induced CPL will benefit to a deep understanding of the excited-state chirality of 2D chiral nanomaterials.

DOI: 10.1002/anie.202114759

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202114759