Topological Isomerism in Three-Dimensional Covalent Organic Frameworks

01 February 2023, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Although isomerism is a typical and significant phenomenon in organic chemistry, it is rarely found in covalent organic framework (COF) materials. Herein, for the first time, we report a controllable synthesis of topological isomers in three-dimensional COFs via a distinctive tetrahedral building unit under different solvents. Based on this strategy, both isomers with dia or qtz net (termed JUC-620 and JUC-621) have been obtained, and their structures are deter-mined by combining powder X-ray diffraction and transmission electron microscopy. Remarkably, these architectures show a dis-tinct difference in their porous features, e.g., JUC-621 with qtz net exhibits permanent mesopores (up to ~ 2.3 nm) and high surface area (~ 2060 m2 g-1), which far surpasses those of JUC-620 with dia net (pore size of ~1.2 nm and surface area of 980 m2 g-1). Further-more, mesoporous JUC-621 can remove dye molecules efficiently and achieves excellent iodine adsorption (up to 6.7 g g-1), which is 2.3 times that of microporous JUC-620 (~2.9 g g-1). This work thus provides a new way for constructing COF isomers and promotes structural diversity and promising applications of COF mate-rials.

Keywords

Covalent Organic Frameworks
Topological Isomerism
qtz net

Supplementary materials

Title
Description
Actions
Title
Supplementary Materials
Description
Materials, characterization and references
Actions

Comments

Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.