A Flexible Hydrogen‐Bonded Organic Framework Constructed from a Tetrabenzaldehyde with a Carbazole N−H Binding Site for the Highly Selective Recognition and Separation of Acetone. (22nd November 2022)

• Record Type: Journal Article
• Authors: Chen, Liangji; Yuan, Zhen; Zhang, Hao; Ye, Yingxiang; Yang, Yisi; Xiang, Fahui; Cai, Kaicong; Xiang, Shengchang; Chen, Banglin; Zhang, Zhangjing
• Is Part Of: Angewandte Chemie. Volume 134:Number 51(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-11-22
• Subjects: Aldehyde -- Gate-Open -- Hydrogen-Bonded Organic Framework -- Turn-on Fluorescence -- Vapor Separation; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202213959
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Rational design of hydrogen‐bonded organic frameworks (HOFs) with multiple functionalities is highly sought after but challenging. Herein, we report a multifunctional HOF (HOF‐FJU‐2 ) built from 4, 4′, 4′′, 4′′′‐(9H‐carbazole‐1, 3, 6, 8‐tetrayl)tetrabenzaldehyde molecule with tetrabenzaldeyde for their H bonding interactions and carbazole N−H site for its specific recognition of small molecules. The Lewis acid N−H sites allow HOF‐FJU‐2 facilely separate acetone from its mixture with another solvent like methanol with smaller p K a value. The donor (D)‐π‐acceptor (A) aromatic nature of the organic building molecule endows this HOF with solvent dependent luminescent/chromic properties, so the column acetone/methanol separation on HOF‐FJU‐2 can be readily visualized. Abstract : Combining tetrabenzaldeyde for hydrogen bonding interactions, a carbazole N−H site for the specific recognition of small molecules, and a D‐π‐A building molecule for solvent‐dependent chromic properties has led to the hydrogen‐bonded organic framework HOF‐FJU‐2. This combination has enabled the separation of an acetone/methanol mixture to be readily visualized.