TY - JOUR
T1 - Application of the collision-complex model to the photophysical processes of singlet oxygen in liquids
AU - Lin, S. H.
AU - Lewis, J.
AU - Moore, Thomas
N1 - Funding Information:
This is publication 048 from the Arizona State University Center for the Study of Early Events in Photosynthesis. The Center is funded by the U.S. Department of Energy grant DE-FG02-88ER1969 as part of the USDA/DOE/NSF Plant Science Center Program. This work was supported in part by NSF. The authors wish to thank Professor P. R. Ogilby and Mr. R. Belford for helpful discussions.
PY - 1991/2/1
Y1 - 1991/2/1
N2 - 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.
AB - 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.
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U2 - 10.1016/1010-6030(91)80003-Z
DO - 10.1016/1010-6030(91)80003-Z
M3 - Article
AN - SCOPUS:0002664139
SN - 1010-6030
VL - 56
SP - 25
EP - 34
JO - Journal of Photochemistry and Photobiology, A: Chemistry
JF - Journal of Photochemistry and Photobiology, A: Chemistry
IS - 1
ER -