摘要
Isomerism is an essential and widespread phenomenon in organic chemistry but rarely observed in covalent organic frameworks(COFs),a novel class of crystalline porous organic polymers with versatile applications.Herein,we give an account of the first example of a controllable synthesis of constitutional isomers of a COF.The two isomers exhibited marked differences in their gas/vapor adsorption behaviors and chemical stability in various solvents.Furthermore,structure transformation from one isomer to the other was realized.This work not only paves the way for rational design and synthesis of COF isomers but also provides a vivid example of structure–property relationship in crystalline porous polymers.
基金
the National Science Fund for Distinguished Young Scholars of China(no.21725404)
Shanghai Scientific and Technological Innovation Project(18JC1410600)
the Strategic Priority Research Program of the Chinese Academy of Sciences(grant no.XDB20000000)for financial support.
