Application of the collision-complex model to the photophysical processes of singlet oxygen in liquids

S. H. Lin, J. Lewis, Thomas A Moore

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In this paper we propose a collision-complex model for the quenching of singlet oxygen by solvents. Using this model, it is possible to explain the diffusion-controlled quenching rate constants observed for quenchers such as carotenes and the group additivity rules observed for quenchers such as ordinary organic molecules by Hurst, Schuster and Rodgers. We also present a theoretical treatment of the spectral shift of singlet oxygen in various solvents. It is applied to interpret the experimental data reported by Bromberg and Foote. It is shown that the agreement between experiment and theory is reasonable. The emission intensity and radiative rate constant of singlet oxygen in liquids are discussed from the viewpoint of the collision-complex model. Both of these properties are shown to be enhanced by solvents and the addition of other quenchers. We also report the experimental data of the quenching of singlet oxygen by 4-amino-TEMPO in methylene chloride solution. The data are analyzed by the collision-complex model. We show that, from the analysis of the experimental decay curves, both relative radiative and non-radiative rate constants can be determined.

Original languageEnglish
Pages (from-to)25-34
Number of pages10
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume56
Issue number1
DOIs
Publication statusPublished - Feb 1 1991

Fingerprint

Singlet Oxygen
Quenching
Rate constants
Oxygen
collisions
quenching
Liquids
oxygen
liquids
carotene
Methylene Chloride
Dichloromethane
Carotenoids
methylene
chlorides
Molecules
shift
decay
curves
molecules

ASJC Scopus subject areas

  • Bioengineering
  • Physical and Theoretical Chemistry

Cite this

Application of the collision-complex model to the photophysical processes of singlet oxygen in liquids. / Lin, S. H.; Lewis, J.; Moore, Thomas A.

In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 56, No. 1, 01.02.1991, p. 25-34.

Research output: Contribution to journalArticle

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