Wavelength dependence of the fluorescence and singlet oxygen quantum yields of new photosensitizers

Adina Lavi; Fred M. Johnson; Benjamin Ehrenberg

doi:10.1016/0009-2614(94)01262-8

Wavelength dependence of the fluorescence and singlet oxygen quantum yields of new photosensitizers

Adina Lavi, Fred M. Johnson, Benjamin Ehrenberg

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

The photophysical properties of Mg and Zn tetrabenzoporphyrins and Cd-texaphyrin are presented. These sensitizers have strong absorption bands in the red and near-IR regions that make them good candidates for biological photosensitization. Singlet oxygen quantum yields which were determined in an absolute manner, in several solvents, are reported. We show an unusual behavior regarding adherence to Kasha's and Vavilov's rules: upon excitation to different electronic states, different values of singlet oxygen quantum yields were obtained. We also show an unusual wavelength dependence of singlet oxygen and fluorescence yields upon excitation to different vibrational levels within the same electronic state.

Original language	English
Pages (from-to)	144-150
Number of pages	7
Journal	Chemical Physics Letters
Volume	231
Issue number	2-3
DOIs	https://doi.org/10.1016/0009-2614(94)01262-8
State	Published - 23 Dec 1994
Externally published	Yes

Bibliographical note

Funding Information:
This work was supportedb y a grant from the Israel ScienceF oundation administeredb y the Israel Academy of Sciences and Humanities. We thank Dr. Jonathan L. Sesslera nd Greg Hemmi from the University of Texas, Austin for the gift of CdTX.

Funding

This work was supportedb y a grant from the Israel ScienceF oundation administeredb y the Israel Academy of Sciences and Humanities. We thank Dr. Jonathan L. Sesslera nd Greg Hemmi from the University of Texas, Austin for the gift of CdTX.

Funders	Funder number
Israel ScienceF oundation
Israel Academy of Sciences and Humanities

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title = "Wavelength dependence of the fluorescence and singlet oxygen quantum yields of new photosensitizers",

abstract = "The photophysical properties of Mg and Zn tetrabenzoporphyrins and Cd-texaphyrin are presented. These sensitizers have strong absorption bands in the red and near-IR regions that make them good candidates for biological photosensitization. Singlet oxygen quantum yields which were determined in an absolute manner, in several solvents, are reported. We show an unusual behavior regarding adherence to Kasha's and Vavilov's rules: upon excitation to different electronic states, different values of singlet oxygen quantum yields were obtained. We also show an unusual wavelength dependence of singlet oxygen and fluorescence yields upon excitation to different vibrational levels within the same electronic state.",

author = "Adina Lavi and Johnson, {Fred M.} and Benjamin Ehrenberg",

note = "Funding Information: This work was supportedb y a grant from the Israel ScienceF oundation administeredb y the Israel Academy of Sciences and Humanities. We thank Dr. Jonathan L. Sesslera nd Greg Hemmi from the University of Texas, Austin for the gift of CdTX.",

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AU - Johnson, Fred M.

AU - Ehrenberg, Benjamin

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Y1 - 1994/12/23

N2 - The photophysical properties of Mg and Zn tetrabenzoporphyrins and Cd-texaphyrin are presented. These sensitizers have strong absorption bands in the red and near-IR regions that make them good candidates for biological photosensitization. Singlet oxygen quantum yields which were determined in an absolute manner, in several solvents, are reported. We show an unusual behavior regarding adherence to Kasha's and Vavilov's rules: upon excitation to different electronic states, different values of singlet oxygen quantum yields were obtained. We also show an unusual wavelength dependence of singlet oxygen and fluorescence yields upon excitation to different vibrational levels within the same electronic state.

AB - The photophysical properties of Mg and Zn tetrabenzoporphyrins and Cd-texaphyrin are presented. These sensitizers have strong absorption bands in the red and near-IR regions that make them good candidates for biological photosensitization. Singlet oxygen quantum yields which were determined in an absolute manner, in several solvents, are reported. We show an unusual behavior regarding adherence to Kasha's and Vavilov's rules: upon excitation to different electronic states, different values of singlet oxygen quantum yields were obtained. We also show an unusual wavelength dependence of singlet oxygen and fluorescence yields upon excitation to different vibrational levels within the same electronic state.

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Wavelength dependence of the fluorescence and singlet oxygen quantum yields of new photosensitizers

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