Enhanced emission by stacking of crown ether side chains in a 2D covalent organic framework
Yuan Liu, Zhu Jun, Shaofei Wu, Chunyan Chi
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.
Topics & Concepts
HydrazoneStackingIntramolecular forceSide chainCrown etherCovalent bondEtherChemistryPhotochemistryLuminescenceMaterials scienceCrystallographyStereochemistryOrganic chemistryPolymerOptoelectronicsIonCovalent Organic Framework ApplicationsLuminescence and Fluorescent MaterialsMetal-Organic Frameworks: Synthesis and Applications