共价有机骨架
共轭体系
共价键
碳纤维
堆积
高分辨率透射电子显微镜
材料科学
轨道能级差
带隙
结晶学
化学
透射电子显微镜
纳米技术
有机化学
分子
复合数
光电子学
复合材料
聚合物
作者
Yingjie Zhao,Hui Liu,Chenyu Wu,Zhaohui Zhang,Qingyan Pan,Fan Hu,Ruiming Wang,Piwu Li,Xiaowen Huang,Zhibo Li
标识
DOI:10.1002/ange.201901194
摘要
Abstract The synthesis of fully conjugated sp 2 ‐carbon covalent organic frameworks (COF) is extremely challenging given the difficulty of the formation of very stable carbon‐carbon double bonds (‐C=C‐). Here, we report the successful preparation of a 2D COF (TP‐COF) based on triazine as central planar units bridged by sp 2 ‐carbon linkers through the ‐C=C‐ condensation reaction. High‐resolution‐transmission electron microscopy (HRTEM) clearly confirmed the tessellated hexagonal pore structure with a pore center‐to‐center distance of 2 nm. Powder X‐ray diffraction (PXRD) together with structural simulations revealed an AA stacking mode of the obtained layered structure. TP‐COF turned out to be an excellent semiconductor material with a LUMO energy of −3.23 eV and a band gap of 2.36 eV. Excitingly, this novel sp 2 ‐carbon conjugated TP‐COF exhibited unprecedented coenzyme regeneration efficiency and can significantly boost the coenzyme‐assisted synthesis of l ‐glutamate to a record‐breaking 97 % yield within 12 minutes.
科研通智能强力驱动
Strongly Powered by AbleSci AI