共轭体系
离域电子
共价键
电子传输链
材料科学
电子
化学物理
化学
聚合物
有机化学
物理
复合材料
生物化学
量子力学
作者
Shitao Wang,Ling Da,Jinsong Hao,Jin Li,Mao Wang,Yan Huang,Zexu Li,Zhiping Liu,Dapeng Cao
标识
DOI:10.1002/anie.202100464
摘要
Abstract Although π‐conjugated two dimensional (2D) covalent organic frameworks (COFs) have been extensively reported, developing fully π‐conjugated 3D COFs is still an extremely difficult problem due to the lack of fully π‐conjugated 3D linkers. We synthesize a fully conjugated 3D COF (BUCT‐COF‐1) by designing a saddle‐shaped building block of aldehyde‐substituted cyclooctatetrathiophene (COThP)‐CHO. As a consequence of the fully conjugated 3D network, BUCT‐COF‐1 demonstrates ultrahigh Hall electron mobility up to ≈3.0 cm 2 V −1 s −1 at room temperature, which is one order of magnitude higher than the current π‐conjugated 2D COFs. Temperature‐dependent conductivity measurements reveal that the charge carriers in BUCT‐ COF‐1 exhibit the band‐like transport mechanism, which is entirely different from the hopping transport phenomena observed in common organic materials. The findings indicate that fully conjugated 3D COFs can achieve electron delocalization and charge‐transport pathways within the whole 3D skeleton, which may open up a new frontier in the design of organic semiconducting materials.
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