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The N\u2010containing cage molecular material, a tertiary amine POC (6FT\u2010RCC3), demonstrates the highest H<jats:sub>2<\/jats:sub>S (hydrogen sulfide) capture (record capacity) for a porous material at room temperature and atmospheric pressure (20.6\u00a0mmol H<jats:sub>2<\/jats:sub>S g<jats:sup>\u22121<\/jats:sup>; 25 H<jats:sub>2<\/jats:sub>S molecules per cage) combined with excellent reversibility for at least five adsorption\u2013desorption cycles. In situ FTIR spectroscopy, solid\u2010state <jats:sup>13<\/jats:sup>C, and <jats:sup>15<\/jats:sup>N CP MAS NMR spectroscopy experiments are applied to investigate the adsorption mechanism, identifying relatively weak interactions via hydrogen bonding. In addition, the fluorescence performances of this POC material are evaluated for the detection and sensing of H<jats:sub>2<\/jats:sub>S, where a clear H<jats:sub>2<\/jats:sub>S selectivity is observed over other gases. Remarkably, the limit of detection (LOD) is calculated to be 0.13\u00a0m<jats:sc>m<\/jats:sc> (\u22484.43\u00a0ppm) in a tetrahydrofuran (THF) solution of H<jats:sub>2<\/jats:sub>S.<\/jats:p>","DOI":"10.1002\/smll.202408155","type":"journal-article","created":{"date-parts":[[2024,11,6]],"date-time":"2024-11-06T09:36:22Z","timestamp":1730885782000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Record\u2010Breaking H<sub>2<\/sub>S Capture and ppm\u2010Level Sensing with a Chemically Stable Porous Organic Cage"],"prefix":"10.1002","volume":"21","author":[{"given":"Juan L.","family":"Obeso","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 Mexico"},{"name":"Laboratorio Nacional de Ciencia Tecnolog\u00eda y Gesti\u00f3n Integrada del Agua (LNAgua) Instituto Polit\u00e9cnico Nacional CICATA U. 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