Fluorescent Sensing of SO <sub>2</sub> by MFM‐300(M) Metal–Organic Frameworks: Influence of Semi‐Open Metal Centres
The MFM-300(M) series (M = Al(III), Sc(III), Cr(III), and In(III)) have previously demonstrated excellent sulfur dioxide (SO<sub>2</sub>) adsorption capabilities, however, their potential as fluorescent SO<sub>2</sub> sensors remains unexplored. Here, this work presents a comparative study of their fluorescence response upon SO<sub>2</sub> exposure, with a particular focus on the role of the metal centers. MFM-300(Al) exhibits the strongest emission and highest quenching upon SO<sub>2</sub> exposure, attributed to localized interactions with µ<sub>2</sub>-OH functional groups and aromatic sites. In contrast, Sc(III) and In(III) analogues show moderate quenching via charge transfer at the semi-open metal sites, while Cr(III) remains weakly emissive. Density Functional Theory (DFT) calculations employing periodic boundary conditions are conducted to characterize the electronic structure of MFM-300(M), to elucidate the role of metal centers in SO<sub>2</sub> retention and to assess the semiconducting nature of these metal- organic frameworks (MOFs).
Authors
- M. Solórzano (ORCID: https://orcid.org/0000-0002-8727-8448)
- Enrique Lima (ORCID: https://orcid.org/0000-0002-5168-5981)
- Yoarhy A. Amador‐Sánchez (ORCID: https://orcid.org/0000-0002-5107-5358)
- Ricardo A. Peralta (ORCID: https://orcid.org/0000-0001-7573-2968)
- Ilich A. Ibarra (ORCID: https://orcid.org/0000-0002-8573-8033)
- Evandro Castaldelli (ORCID: https://orcid.org/0000-0003-2946-8697)
- Diego Solís-Ibarra (ORCID: https://orcid.org/0000-0002-2486-0967)
- Sihai Yang⧫ (ORCID: https://orcid.org/0000-0002-1111-9272)
- Christian A. Celaya (ORCID: https://orcid.org/0000-0001-9415-2766)
- Edward Lester
- Marcela Martı́nez (ORCID: https://orcid.org/0000-0002-6236-7903)
- Andrea Laybourn (ORCID: https://orcid.org/0000-0003-4093-2243)
- Valeria B. López‐Cervantes
- Hashim Alhashimi (ORCID: https://orcid.org/0000-0002-1053-0430)
Institutions
- University of Leeds (GB)
- University of Nottingham (GB)
- Universidad Autónoma de Baja California (MX)
- Universidad Autónoma Metropolitana (MX)
- Peking University (CN)
- Beijing National Laboratory for Molecular Sciences (CN)
- Instituto Politécnico Nacional (MX)
- Centro de Investigación Científica y de Educación Superior de Ensenada (MX)
- Universidad Nacional Autónoma de México (MX)
Publication Details
- Journal
- Small
- Published
- 2025-09-01
- DOI
- https://doi.org/10.1002/smll.202507448
- Primary Topic
- Metal-Organic Frameworks: Synthesis and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- UK Research and Innovation
- China National Offshore Oil Corporation
- Engineering and Physical Sciences Research Council
- Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México