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Fluorescence Modulation in UiO-66-NH2 via Photooxidation and Selective Reduction.

Yongdeok Ahn1,2, Minsoo Park1, Younghu Son3

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ACS Omega
|September 29, 2025
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Summary
This summary is machine-generated.

Metal-organic frameworks (MOFs) show tunable fluorescence. Photo-oxidation quenches fluorescence, but mild alcohols restore it, enhancing porosity and enabling reconfigurable optical materials.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Emissive metal-organic frameworks (MOFs) possess tunable photophysical properties.
  • These properties are sensitive to coordination environment and structural configuration.

Purpose of the Study:

  • To demonstrate fluorescence modulation in UiO-66-NH2 via photo-oxidation and solvent-mediated recovery.
  • To establish a structure-function relationship governed by localized redox chemistry in MOFs.

Main Methods:

  • Visible-light irradiation to induce photo-oxidation and reactive oxygen species formation.
  • Treatment with various alcohols for solvent-mediated reduction and recovery.
  • Nitrogen adsorption analysis to assess porosity changes.

Main Results:

  • Photo-oxidation led to ligand and metal-oxo cluster oxidation, causing fluorescence loss.
  • Mild alcohol treatment selectively removed oxidative species, partially restoring fluorescence and porosity.
  • Nitrogen uptake increased in some alcohol-treated samples, indicating pore expansion.

Conclusions:

  • Localized redox chemistry dictates MOF structure-function relationships.
  • UiO-66-NH2 can be reconfigured optically and texturally through redox stimuli.
  • This work provides a platform for designing switchable photophysical and porous materials.