Enhanced emission by stacking of crown ether side chains in a 2D covalent organic framework

Liu Yuan; Jun Zhu; Shaofei Wu; Chunyan Chi

doi:10.1039/d1cc03409j

Enhanced emission by stacking of crown ether side chains in a 2D covalent organic framework

Chem Commun (Camb). 2022 Jan 27;58(9):1302-1305. doi: 10.1039/d1cc03409j.

Authors

Liu Yuan^{1

2}, Jun Zhu¹, Shaofei Wu¹, Chunyan Chi¹

Affiliations

¹ Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore, Singapore. chmcc@nus.edu.sg.
² State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China.

PMID: 34989727
DOI: 10.1039/d1cc03409j

Abstract

Hydrazone compounds could be highly emissive in the solid state. However, most hydrazone-linking COFs are poorly luminescent. Here we report the enhancement of fluorescence in a 2D hydrazone-linking COF by side chain engineering. Stacking of the bulky and semi-rigid crown ether side chains restricts intramolecular rotation of the backbone around the hydrazone linkers, reducing the thermal dissipation and achieving 20-fold improved emission.