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Singlet Oxygen Quantum Yields: Comparing Chemical Probe and Time-Resolved Phosphorescence.

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Summary

Comparing singlet oxygen (1O2) measurement methods, this study found significant differences in quantum yields between the furfuryl alcohol (FFA) probe and direct phosphorescence. Direct phosphorescence yielded higher 1O2 efficiencies for dissolved organic matter.

Keywords:
aquatic photochemistryreactive oxygen speciessinglet oxygen phosphorescencetransient absorption spectroscopytriplet reactivity

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Area of Science:

  • Environmental Chemistry
  • Photochemistry
  • Analytical Chemistry

Background:

  • Singlet oxygen (1O2) is a key reactive species in aquatic photochemistry, influencing pollutant transformation.
  • The furfuryl alcohol (FFA) probe is commonly used to quantify 1O2 generation in aquatic environments.
  • Direct measurement of 1O2 via its phosphorescence emission is an emerging, interest-generating alternative.

Purpose of the Study:

  • To directly compare singlet oxygen (1O2) quantum yields (ΦΔ) obtained using the FFA chemical probe and direct 1O2 phosphorescence methods.
  • To evaluate the performance of these methods across diverse samples, including small molecule sensitizers and various forms of dissolved organic matter (DOM) and pyrogenic DOM (PyDOM).
  • To investigate potential interference from FFA-mediated triplet excited state quenching processes.

Main Methods:

  • Quantification of 1O2 quantum yields (ΦΔ) using both the furfuryl alcohol (FFA) chemical probe and direct 1O2 phosphorescence spectroscopy.
  • Application of methods to a range of samples: small molecule sensitizers, dissolved organic matter (DOM) isolates, and pyrogenic DOM (PyDOM).
  • Laser spectroscopy was employed to explore FFA interactions with sensitizer triplet excited states.

Main Results:

  • Significant discrepancies in measured 1O2 quantum yields (ΦΔ) were observed between the FFA and phosphorescence methods for several small molecule sensitizers and DOM/PyDOM samples.
  • The direct 1O2 phosphorescence method reported 1.4 to 3.8 times higher ΦΔ values for DOM/PyDOM compared to the FFA method.
  • FFA demonstrated effective quenching and/or reaction with triplet excited states of small molecule sensitizers, but minimal quenching was observed for DOM/PyDOM triplet states.

Conclusions:

  • The furfuryl alcohol (FFA) probe may not accurately represent singlet oxygen (1O2) generation efficiencies in all aquatic systems due to potential interactions with sensitizer triplet states, particularly for dissolved organic matter (DOM).
  • The direct 1O2 phosphorescence method appears to provide more reliable quantum yield measurements for DOM/PyDOM.
  • This study highlights the importance of considering probe-sensitizer interactions in 1O2 quantification and supports the advancement of phosphorescence-based measurement techniques.