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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
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A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
10:13

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

Published on: April 28, 2023

A Metal-Organic Framework Platform Enabling Visible-to-Ultraviolet Upconversion-Driven Heterogeneous Photochemistry.

Subhrajyoti Ghosh1, Sakura Nakagawa1, Masanori Uji1

  • 1Department of Chemistry, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan.

JACS Au
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

This study demonstrates efficient visible-to-ultraviolet (vis-to-UV) triplet-triplet annihilation photon upconversion (TTA-UC) within a metal-organic framework (MOF). This stable MOF system enables new possibilities for sustainable photochemistry and light-driven applications.

Keywords:
Metal−Organic FrameworkPhotocatalysisPhoton UpconversionPhotostabilityUltraviolet LightUncaging Reaction

Related Experiment Videos

Last Updated: Jun 27, 2026

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

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

Published on: April 28, 2023

Area of Science:

  • Materials Science
  • Photochemistry
  • Nanotechnology

Background:

  • Triplet-triplet annihilation photon upconversion (TTA-UC) converts low-energy photons to higher-energy photons, crucial for applications like photocatalysis and optoelectronics.
  • Efficient and stable visible-to-ultraviolet (vis-to-UV) TTA-UC in solid materials is challenging due to issues like annihilator aggregation and poor photostability.
  • Metal-organic frameworks (MOFs) offer tunable, stable platforms for integrating functional components.

Purpose of the Study:

  • To develop a novel, stable material for efficient vis-to-UV TTA-UC.
  • To investigate the utility of MOF-based TTA-UC systems in heterogeneous photochemical reactions.
  • To establish a sustainable, mercury- and UV-lamp-free UV light source.

Main Methods:

  • Co-incorporation of a p-terphenyl dicarboxylic acid annihilator (TP-(COOH)2) and an iridium sensitizer (Ir-(dFppy-COOH)3) into a Zr-based UiO-68 framework.
  • Characterization of the hybrid MOF's structure, photophysical properties, and stability.
  • Demonstration of the MOF's performance in vis-to-UV TTA-UC and application in uncaging MNI-caged l-glutamate.

Main Results:

  • The hybrid MOF exhibits efficient vis-to-UV TTA-UC with a 0.60% upconversion efficiency upon 445 nm excitation.
  • The rigid MOF structure effectively prevents chromophore aggregation, leading to excellent photostability.
  • The MOF-based system successfully enabled spatiotemporally controlled uncaging in a heterogeneous photochemical reaction.

Conclusions:

  • A stable, MOF-based platform for vis-to-UV TTA-UC in suspension has been successfully established.
  • This MOF system demonstrates significant potential for sustainable photochemistry, photocatalysis, and advanced light-driven functional materials.
  • The findings open new avenues for designing advanced upconversion materials within robust frameworks.