Issue 29, 2022

Enhanced luminescence in multivariate metal–organic frameworks through an isolated-ligand strategy

Abstract

Numerous luminescent metal–organic frameworks (LMOFs) with desired functionalized ligands often suffer from solid-state fluorescence quenching, which greatly restricts their practical applications. The multivariate LMOFs and isolated-ligand strategy provide an effective platform to address the above defect. In this work, two new zinc-based MOFs constructed with isolated ligands [1,1′:4′,1′′-terphenyl]-4,4′′-dicarboxylic acid (H2TPDC) or desired functionalized ligands 4,4′-(benzo[c][1,2,5]-thiadiazole-4,7-diyl)dibenzoic acid (H2BTDD), denoted as ZJU-235 and ZJU-236, were synthesized and their structures were well characterized. Then, a series of isostructural multivariate LMOFs with different ratios of H2BTDD with a solid-state fluorescence quenching feature and H2TPDC were synthesized and used to enhance the photoluminescence quantum yield of H2BTDD in ZJU-236. Thanks to the isolation of H2TPDC, the solid-state fluorescence quenching of the LMOF is suppressed, the quantum yield of the LMOF significantly increases from ∼0.00% to as high as 80.92% and a high efficiency luminescent material is obtained. Furthermore, preliminary studies based on steady-state and time-resolved photoluminescence experiments also reveal that the solid-state fluorescence quenching can be systematically tuned by an isolated-ligand strategy. We believe that the general approach can be extended to other linker systems for the development of well-functionalized LMOFs.

Graphical abstract: Enhanced luminescence in multivariate metal–organic frameworks through an isolated-ligand strategy

Supplementary files

Article information

Article type
Paper
Submitted
11 May 2022
Accepted
21 Jun 2022
First published
22 Jun 2022

J. Mater. Chem. C, 2022,10, 10473-10479

Enhanced luminescence in multivariate metal–organic frameworks through an isolated-ligand strategy

Z. Jiang, H. Zheng, L. Guan, Y. Yang, Y. Cui and G. Qian, J. Mater. Chem. C, 2022, 10, 10473 DOI: 10.1039/D2TC01949C

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