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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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A redox active switch for lanthanide luminescence in phenolate complexes.

J K Molloy1, O Jarjayes2, C Philouze2

  • 1Département de Chimie Moléculaire, Chimie Inorganique Redox (CIRE), UMR CNRS 5250, Université Grenoble-Alpes, B. P. 53, 38041 Grenoble Cedex 9, France. fabrice.thomas@univ-grenoble-alpes.fr and Laboratoire de Reconnaissance Ionique et Chimie de Coordination SCIB, UMR-E3 CEA-UJF, INAC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09, France.

Chemical Communications (Cambridge, England)
|December 17, 2016
PubMed
Summary
This summary is machine-generated.

Reversible oxidation of phenolates to phenoxyl radicals quenches f metal ion luminescence by over 95%. This finding is crucial for understanding electron transfer in lanthanide complexes.

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Area of Science:

  • Coordination chemistry
  • Photophysics
  • Lanthanide chemistry

Background:

  • Lanthanide ions are known for their unique luminescence properties.
  • Phenolate ligands can undergo redox reactions.
  • Understanding the interplay between ligand redox activity and metal luminescence is essential.

Purpose of the Study:

  • To investigate the effect of phenolate ligand oxidation on f metal ion luminescence.
  • To explore the mechanism of luminescence quenching in lanthanide complexes.

Main Methods:

  • Electrochemical studies to induce and monitor phenolate oxidation.
  • Spectroscopic techniques (luminescence spectroscopy) to quantify emission changes.
  • Computational modeling to understand electronic structure changes.

Main Results:

  • Reversible oxidation of coordinated phenolates to phenoxyl radicals was achieved.
  • A dramatic luminescence quenching (>95%) of the f metal ion was observed upon oxidation.
  • The quenching effect was found to be reversible, correlating with the redox state of the ligand.

Conclusions:

  • The oxidation of phenolates to phenoxyl radicals is an effective strategy to quench f metal ion luminescence.
  • This study provides insights into electron transfer processes and their impact on lanthanide photophysics.
  • The findings have implications for designing luminescent sensors and switches.