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journal article·2026-07Open access

Mechanistic Insight into H 2 S‐Induced Fluorescence Quenching in a Robust Metal–Organic Framework

Valeria B. López‐Cervantes, Juan L. Obeso, J. Gabriel Flores, Ricardo A. Peralta, José Antonio de los Reyes, Jiangnan Li, Sihai Yang, Elodie Strupiechonski, Andrés De Luna Bugallo, Aída Gutiérrez‐Alejandre, Yoarhy A. Amador‐Sánchez, Diego Solis‐Ibarra, Ilich A. Ibarra

Small· Volume 22· Issue 39
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Abstract

ABSTRACT The development of chemically robust sorbents capable of integrating capture and optical sensing of toxic gas remains a major challenge. Herein, the ultramicroporous Zn(II)‐based metal‐organic framework, MFM‐520, has been investigated for the adsorption and luminescent detection of H 2 S. Breakthrough measurements at 298 K and 1 bar show a reversible H 2 S uptake of 3.91 mmol g −1 , while powder X‐ray diffraction confirms full retention of crystallinity after adsorption. Solid‐state photoluminescence experiments reveal a pronounced, selective fluorescence turn‐off response to H 2 S in the gas phase, with a limit of detection of 6.13 ppm. Time‐resolved spectroscopy shows a decrease in the excited‐state lifetime upon H 2 S adsorption, indicating enhanced non‐radiative decay pathways. In situ DRIFTS measurements indicate that H 2 S interacts with MFM‐520 through supramolecular interactions. The combined adsorption, structural, and spectroscopic analyses establish that fluorescence quenching arises from reversible, confinement‐amplified modulation of ligand‐centered excited‐state dynamics. These results highlight how coordinatively saturated Zn(II) nodes within ultramicroporous environments can couple chemical stability with selective luminescent gas sensing.
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Research context

OpenAlex topics: Metal-Organic Frameworks: Synthesis and Applications · Gas Sensing Nanomaterials and Sensors · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratorio de Fisicoquímica y Reactividad De Superficies (LaFReS) Instituto De Investigaciones en Materiales Universidad Nacional Autónoma De México Ciudad de México México

College of Chemistry and Molecular Engineering Beijing National Laboratory For Molecular Sciences Peking University Beijing China

Departamento de Ingeniería de Procesos e Hidráulica División de Ciencias Básicas e Ingeniería Universidad Autónoma Metropolitana‐Iztapalapa Ciudad de México México

Área de Química Aplicada, Departamento De Ciencias Básicas Universidad Autónoma Metropolitana‐Azcapotzalco Ciudad de México México

Departamento de Química División De Ciencias Básicas e Ingeniería. Universidad Autónoma Metropolitana‐Iztapalapa Ciudad de México México

Centro de Ingeniería y Desarrollo Industrial Querétaro Mexico

Centro de Física Aplicada y Tecnología Avanzada Universidad Nacional Autónoma De México Querétaro México

UNICAT, Departamento De Ingeniería Química Facultad De Química Universidad Nacional Autónoma De México Ciudad de México México

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