The Origin of Dual Emission in Antiparallel-Stacked Two-Dimensional Covalent Organic Frameworks,ACS Materials Letters

当前位置： X-MOL 学术 › ACS Mater. Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

The Origin of Dual Emission in Antiparallel-Stacked Two-Dimensional Covalent Organic Frameworks
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-05-04 , DOI: 10.1021/acsmaterialslett.0c00119
Xing Li ₁ , Jingsi Qiao ₂ , Su Ying Quek _{2,

3} , Kian Ping Loh _{1,

2}

Affiliation

Most previous reports on covalent organic frameworks (COFs) are centered on eclipsed (or presumably eclipsed) structures, while the properties peculiar to the antiparallel stacked structure are little known. Recently, we discover that two-dimensional (2D) acylhydrazone COFs with alkyoxy side chains adopt an antiparallel stacked structure. This provides us with the opportunity to re-examine the origin of dual emission in such COFs in the context of an antiparallel stacked structure, in lieu of an earlier proposal based on incorrectly assigned eclipsed stacked structure. We discover that the intralayer and interlayer hydrogen bonding in the antiparallel stacked structure work synergistically to restrict intermolecular bond rotation, thus turning on fluorescence. The interlayer hydrogen bonding between the acyl oxygen and the side-chain hydrogen is stronger in the dual emissive COF, compared to those in the single emissive ones, underscoring the roles of competing interhydrogen and intrahydrogen bonds in the excited-state conformers.

中文翻译：

反平行堆积二维共价有机骨架中双重发射的起源

先前有关共价有机骨架（COF）的大多数报道都以偏光（或可能是偏光）结构为中心，而反平行堆叠结构特有的特性鲜为人知。最近，我们发现带有烷氧基侧链的二维（2D）酰基hydr COF采用反平行堆叠结构。这为我们提供了一个机会，可以在反平行堆叠结构的背景下重新检查此类COF中的双重发射的起源，代替先前基于分配不正确的日食堆叠结构的提议。我们发现反平行堆叠结构中的层内和层间氢键协同作用，以限制分子间键的旋转，从而开启荧光。

更新日期：2020-05-04

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11