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Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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Related Experiment Video

Updated: Jun 3, 2026

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
10:13

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Mechanistic Insight into H2S-Induced Fluorescence Quenching in a Robust Metal-Organic Framework.

Valeria B López-Cervantes1, Juan L Obeso2, J Gabriel Flores3,4

  • 1Laboratorio de Fisicoquímica y Reactividad De Superficies (LaFReS), Instituto De Investigaciones en Materiales, Universidad Nacional Autónoma De México, Ciudad de México, México.

Small (Weinheim an Der Bergstrasse, Germany)
|June 2, 2026
PubMed
Summary

This study introduces MFM-520, a metal-organic framework for capturing and optically sensing hydrogen sulfide (H₂S). This robust material demonstrates selective fluorescence quenching for accurate H₂S detection.

Keywords:
H2SMOFadsorptionfluorescent sensingstructure

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Nanotechnology

Background:

  • Developing chemically stable sorbents for simultaneous toxic gas capture and optical sensing is challenging.
  • Metal-organic frameworks (MOFs) offer tunable properties for gas adsorption and detection.

Purpose of the Study:

  • To investigate the ultramicroporous Zn(II)-based metal-organic framework, MFM-520, for hydrogen sulfide (H₂S) adsorption and luminescent detection.
  • To understand the mechanism behind the selective fluorescence response to H₂S.

Main Methods:

  • Breakthrough measurements for H₂S uptake.
  • Powder X-ray diffraction (PXRD) for structural analysis.
  • Solid-state photoluminescence and time-resolved spectroscopy.
  • In situ DRIFTS for interaction studies.

Main Results:

  • MFM-520 exhibits reversible H₂S uptake (3.91 mmol g⁻¹ at 298 K, 1 bar) with retained crystallinity.
  • Selective fluorescence turn-off response to H₂S with a limit of detection of 6.13 ppm.
  • H₂S adsorption quenches fluorescence via enhanced non-radiative decay pathways and supramolecular interactions.

Conclusions:

  • MFM-520 effectively integrates H₂S capture and luminescent sensing.
  • The sensing mechanism involves confinement-amplified modulation of excited-state dynamics.
  • Coordinatively saturated Zn(II) nodes in ultramicroporous MOFs enable stable and selective gas sensing.