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Here, this work presents a comparative study of their fluorescence response upon SO\n                    <jats:sub>2<\/jats:sub>\n                    exposure, with a particular focus on the role of the metal centers. MFM\u2010300(Al) exhibits the strongest emission and highest quenching upon SO\n                    <jats:sub>2<\/jats:sub>\n                    exposure, attributed to localized interactions with\n                    <jats:italic>\u00b5<\/jats:italic>\n                    <jats:sub>2<\/jats:sub>\n                    \u2010OH functional groups and aromatic sites. In contrast, Sc(III) and In(III) analogues show moderate quenching via charge transfer at the semi\u2010open 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\u2010300(M), to elucidate the role of metal centers in SO\n                    <jats:sub>2<\/jats:sub>\n                    retention and to assess the semiconducting nature of these metal\u2010 organic frameworks (MOFs).\n                  <\/jats:p>","DOI":"10.1002\/smll.202507448","type":"journal-article","created":{"date-parts":[[2025,9,1]],"date-time":"2025-09-01T11:23:36Z","timestamp":1756725816000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Fluorescent Sensing of SO\n                    <sub>2<\/sub>\n                    by MFM\u2010300(M) Metal\u2013Organic Frameworks: Influence of Semi\u2010Open Metal Centres"],"prefix":"10.1002","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8274-2432","authenticated-orcid":false,"given":"Valeria B.","family":"L\u00f3pez\u2010Cervantes","sequence":"first","affiliation":[{"name":"Laboratorio de Fisicoqu\u00edmica y Reactividad de Superficies (LaFReS) Instituto de Investigaciones en Materiales Universidad Nacional Aut\u00f3noma de M\u00e9xico  Circuito Exterior s\/n, CU, Coyoac\u00e1n Ciudad de M\u00e9xico 04510 M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1053-0430","authenticated-orcid":false,"given":"Hashim","family":"Alhashimi","sequence":"additional","affiliation":[{"name":"Advanced Materials Research Group Faculty of Engineering University of Nottingham  Nottingham NG7 2NR UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9415-2766","authenticated-orcid":false,"given":"Christian A.","family":"Celaya","sequence":"additional","affiliation":[{"name":"Centro de Nanociencias y Nanotecnolog\u00eda Universidad Nacional Aut\u00f3noma de M\u00e9xico Km 107 Carretera Tijuana\u2010Ensenada Ensenada Baja California 22860 M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8727-8448","authenticated-orcid":false,"given":"M.","family":"Sol\u00f3rzano","sequence":"additional","affiliation":[{"name":"Centro de Nanociencias y Nanotecnolog\u00eda Universidad Nacional Aut\u00f3noma de M\u00e9xico Km 107 Carretera Tijuana\u2010Ensenada Ensenada Baja California 22860 M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marco L.","family":"Mart\u00ednez","sequence":"additional","affiliation":[{"name":"Laboratorio de Fisicoqu\u00edmica y Reactividad de Superficies (LaFReS) Instituto de Investigaciones en Materiales Universidad Nacional Aut\u00f3noma de M\u00e9xico  Circuito Exterior s\/n, CU, Coyoac\u00e1n Ciudad de M\u00e9xico 04510 M\u00e9xico"},{"name":"Laboratorio de Investigaci\u00f3n en Materiales Porosos Cat\u00e1lisis Ambiental y Qu\u00edmica Fina ESIQIE \u2013 Instituto Polit\u00e9cnico Nacional  Avenida IPN UPALM Edificio 7, Zacatenco Ciudad de M\u00e9xico 07738 M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5107-5358","authenticated-orcid":false,"given":"Yoarhy A.","family":"Amador\u2010S\u00e1nchez","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica Universidad Aut\u00f3noma Metropolitana\u2010Iztapalapa Av. 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