1. Tuning the Topology of Two‐Dimensional Covalent Organic Frameworks through Site‐Selective Synthetic Strategy.
- Author
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Wu, Xueying, Tang, Xihao, Zhang, Kai, Harrod, Chelsea, Li, Rui, Wu, Jialin, Yang, Xi, Zheng, Shengrun, Fan, Jun, Zhang, Weiguang, Li, Xinle, and Cai, Songliang
- Subjects
TOPOLOGY ,FREE groups ,GENTIAN violet ,ORGANIC dyes ,CONGO red (Staining dye) ,ADSORPTION capacity ,COORDINATION polymers - Abstract
Tuning the topology of two‐dimensional (2D) covalent organic frameworks (COFs) is of paramount scientific interest but remains largely unexplored. Herein, we present a site‐selective synthetic strategy that enables the tuning of 2D COF topology by simply adjusting the molar ratio of an amine‐functionalized dihydrazide monomer (NH2−Ah) and 4,4′,4′′‐(1,3,5‐triazine‐2,4,6‐triyl)tribenzaldehyde (Tz). This approach resulted in the formation of two distinct COFs: a clover‐like 2D COF with free amine groups (NH2−Ah−Tz) and a honeycomb‐like COF without amine groups (Ah−Tz). Both COFs exhibited good crystallinity and moderate porosity. Remarkably, the clover‐shaped NH2−Ah−Tz COF, with abundant free amine groups, displayed significantly enhanced adsorption capacities toward crystal violet (CV, 261 mg/g) and congo red (CR, 1560 mg/g) compared to the non‐functionalized honeycomb‐like Ah−Tz COF (123 mg/g for CV and 1340 mg/g for CR), underscoring the pivotal role of free amine functional groups in enhancing adsorption capacities for organic dyes. This work highlights that the site‐selective synthetic strategy paves a new avenue for manipulating 2D COF topology by adjusting the monomer feeding ratio, thereby modulating their adsorption performances toward organic dyes. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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