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Standards for Singlet Oxygen Sensitization

  • A. A. Gorman
  • I. Hamblett
  • C. Lambert
  • A. L. Prescott
Conference paper
Part of the NATO ASI Series book series (volume 15)

Abstract

For triplet sensitization of \({0_2}({}^l{\Delta _g})\) the quantum yield, ØΔ, is given by eq 1 where ØT and SΔ are respectively the triplet yield and the fraction of triplet quenchings by oxygen which yield \({0_2}({}^l{\Delta _g})\). Interest in these
$${\phi _\Delta } = {\phi _T} \times {S_\Delta }$$
(1)
quantitative aspects has stemmed from the biological virulence of this species and the development of the technique of photodynamic therapy J The most accurate time-resolved technique for the determination of \({0_2}({}^l{\Delta _g})\) yields and kinetic parameters involves the monitoring of the weak IR luminescence at 1270 nm. However the nature of the technique, coupled with the potential variation in the radiative rate constant with solvent, has required an absolute standard for emission in each medium of interest. A set of standards based on the system outlined in eq 2 has recently been 2 developed and in this work we describe the determination of the SΔ value for a triene of biological importance.

Keywords

Benzene Solution Electronic Excitation Energy Triplet Energy Absolute Standard Triplet Lifetime 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1).
    Kessel D, Dougherty TJ (Eds) (1983) Porphyrin photosensitization. Plenum New YorkGoogle Scholar
  2. 2).
    Gorman AA, Hamblett I, Lambert C, Prescott AL, Rodgers MAJ, Spence HM (1987) Aromatic ketone-naphthalene systems as absolute standards for the triplet-sensitized formation of singlet oxygen in organic and aqueous media: a time resolved study J Amer Chem Soc 109: 3091–3097Google Scholar
  3. 3).
    Jacobs HJC, Havinga E (1979) Photochemistry of vitamin D and its isomers and of simple trienes Adv Photochem 11: 305–373Google Scholar
  4. 4).
    Gorman AA, Hamblett I (unpublished data)Google Scholar

Copyright information

© Springer- Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • A. A. Gorman
    • 1
  • I. Hamblett
    • 1
  • C. Lambert
    • 1
  • A. L. Prescott
    • 1
  1. 1.Chemistry DepartmentUniversity of ManchesterManchesterUK

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