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Updated: Sep 24, 2025
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A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
Published on: April 28, 2023
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Unravelling the true MOF-5 luminescence
Vincent Villemot1, Matthieu Hamel1, Robert B Pansu2
1CEA, LIST, Laboratoire Capteurs et Architectures Électroniques F-91191 Gif-sur-Yvette Cedex France guillaume.bertrand@cea.fr.
RSC Advances
|May 6, 2022
Summary
Highly pure MOF-5 crystals exhibit solvent-dependent photoluminescence, revealing true emission at 355 nm. This study clarifies MOF-5
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Metal-Organic Frameworks (MOFs) are porous materials with diverse applications.
- MOF-5 is an iconic MOF whose photoluminescence properties require precise characterization.
- Previous studies on MOF-5 luminescence have been complicated by solvent effects.
Purpose of the Study:
- To synthesize highly pure, millimeter-sized MOF-5 single crystals.
- To investigate the solvent-guest dependency of MOF-5's photoluminescence.
- To determine the intrinsic luminescence of MOF-5, free from solvent interference.
Main Methods:
- Synthesis and characterization of high-purity MOF-5 single crystals.
- Photoluminescence (PL) spectroscopy.
- Time-correlated single photon counting (TCSPC) for lifetime measurements.
Main Results:
- MOF-5 emission is ligand-centered and strongly dependent on solvent presence.
- True MOF-5 luminescence was measured at 355 nm, a lower wavelength than previously reported.
- Hydration effects and the influence of Zn4O subunits on fluorescence were elucidated.
Conclusions:
- Accurate photoluminescence measurements of MOF-5 require phase-pure materials.
- Solvent and moisture significantly influence MOF-5's observed electronic transitions.
- This work provides a rigorous re-evaluation of MOF-5's photoluminescence properties.
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