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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds. 
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Singlet oxygen is an emissive ligand.

Paul Asselin1, Adrien Schlachter1, Pierre D Harvey1

  • 1Département de Chimie, Université de Sherbrooke, 2500 Boul. de l'Université, Sherbrooke, QC, J1K 2R1, Canada. Pierre.Harvey@USherbrooke.ca.

Chemical Communications (Cambridge, England)
|July 8, 2024
PubMed
Summary

Gaseous singlet oxygen (1O2) demonstrates unprecedented emissive ligand behavior after collisional photosensitization. This finding was confirmed by monitoring its phosphorescence and excited state lifetime under varied atmospheric conditions.

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Area of Science:

  • Photochemistry
  • Chemical Physics
  • Spectroscopy

Background:

  • Singlet oxygen (1O2) is a highly reactive oxygen species.
  • Its role as an emissive ligand in gaseous states is not well-established.
  • Photosensitization is a key method for generating 1O2.

Purpose of the Study:

  • To provide experimental evidence for gaseous singlet oxygen (1O2) acting as an emissive ligand.
  • To investigate the influence of atmospheric environment on 1O2 phosphorescence and lifetime.

Main Methods:

  • Generation of singlet oxygen (1O2) using tetraphenylporphyrin photosensitizers.
  • Monitoring of 1O2 phosphorescence intensity at approximately 1275-1280 nm.
  • Measurement of singlet oxygen excited state lifetime under varying atmospheric conditions.

Main Results:

  • Unprecedented experimental evidence confirms gaseous singlet oxygen (1O2) functions as an emissive ligand.
  • Observed changes in phosphorescence intensity and excited state lifetime indicate ligand behavior.
  • Atmospheric composition significantly affects 1O2 emissive properties.

Conclusions:

  • Gaseous singlet oxygen (1O2) exhibits novel emissive ligand characteristics.
  • Collisional photosensitization is a viable pathway for observing this phenomenon.
  • Environmental factors play a crucial role in modulating singlet oxygen's emissive ligand behavior.