Jiang Shu-Yan, Gan Shi-Xian, Zhang Xi, Li Hui, Qi Qiao-Yan, Cui Fu-Zhi, Lu Jian, Zhao Xin
Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China.
University of Chinese Academy of Sciences , Beijing 100049 , China.
J Am Chem Soc. 2019 Sep 25;141(38):14981-14986. doi: 10.1021/jacs.9b08017. Epub 2019 Sep 11.
New linkage chemistry will endow covalent organic frameworks (COFs) with not only structural diversity but also fascinating properties. However, to develop a new type of linkages has been a great challenge. We herein report the first two COFs using aminal as the linkages. These two COFs have been synthesized by condensation of secondary amine and aldehyde. They crystallize in net, which is a new topology for COFs. The aminal linkage is found to favor reservation of photophysical property of the monomers due to its tetrahedral geometry and nonconjugated feature. These aminal-COFs exhibit good thermal stability and high chemical stability under neutral and basic conditions.
新型连接化学将赋予共价有机框架（COFs）不仅结构多样，而且具有迷人的特性。然而，开发一种新型连接方式一直是一项巨大的挑战。我们在此报告了首例以缩醛胺为连接方式的两种COFs。这两种COFs是通过仲胺与醛的缩合反应合成的。它们以 网络结构结晶，这是COFs的一种新拓扑结构。由于其四面体几何形状和非共轭特征，发现缩醛胺连接方式有利于保留单体的光物理性质。这些缩醛胺基COFs在中性和碱性条件下表现出良好的热稳定性和高化学稳定性。
