Construction of Crystalline Nitrone-Linked Covalent Organic Frameworks Via Kröhnke Oxidation
Fangyuan Kang1, Xin Wang1, Cailing Chen2
1Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR 999077, P. R. China.
Abstract:
Developing diverse synthetic routes to prepare various crystalline covalent organic frameworks (COFs) and enrich the family of COFs is very important and highly desirable. In this research, we demonstrate that Kröhnke oxidation (originally developed to prepare carbonyl compounds) can be employed as an efficient method to construct two crystalline nitrone-linked COFs (CityU-1 and CityU-2) through the ingenious design of the polynitroso-containing precursors as well as the exquisite control of the polymerization conditions. The formation and structure of nitrone-based linkage units have been confirmed through a mode reaction. The as-obtained crystalline COFs have been characterized by Fourier transform infrared and X-ray photoelectron spectroscopy, powder X-ray diffraction patterns, and scanning electron microscopy. Notably, CityU-1 exhibits a BET specific surface area of 497.9 m2g-1 with an I2 capture capacity of 3.0 g g-1 at 75 °C. Our research would provide more chances to prepare various crystalline COFs for diverse applications.
More Related Videos
Related Concept Videos
Ketones with Nonenolizable Aromatic Aldehydes: Claisen–Schmidt Condensation
As the self-condensation of ketones is generally not favored in basic conditions, the self-condensed products do not form in the reaction between ketones and benzaldehyde. The general reaction of Claisen–Schmidt...
Preparation of Nitriles
Nitriles to Ketones: Grignard Reaction
The mechanism begins with a nucleophilic attack by the Grignard...
Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview
Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism
Preparation of Carboxylic Acids: Hydrolysis of Nitriles


