The effect of solvent deuteration on the photophysics of sulphonated aluminium phthalocyanine

The photophysics of disulphonated aluminium phthalocyanine in protiated and deuterated aqueous phosphate-buffered saline solution are reported. In the deuterated solvent the rate coefficients of fluorescence and intersystem crossing are unaffected by the heavier isotope; however, the rate of interna...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. B, Biology Biology, 1992-10, Vol.16 (1), p.73-81
Main Authors: Beeby, Andrew, Parker, Anthony W., Simpson, Mary S.C., Phillips, David
Format: Article
Language:English
Subjects:
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Molecular biophysics
Photochemistry. Photosynthesis. Bioluminescence
photosensitization
Phthalocyanines
Radiation-biomolecule interaction
singlet oxygen
solvent deuteration
triplet lifetime
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Summary:The photophysics of disulphonated aluminium phthalocyanine in protiated and deuterated aqueous phosphate-buffered saline solution are reported. In the deuterated solvent the rate coefficients of fluorescence and intersystem crossing are unaffected by the heavier isotope; however, the rate of internal conversion from S 1 to S 0 has been shown to be considerably reduced. This results in increased quantum yields of fluorescence and triplet-state formation and also increased triplet and singlet lifetimes in deuterium oxide (Φ f0.40±0.04, τ f5.1±0.1 ns and τ t600±30 μs in H 2O and Φ f0.52±0.06, τ f6.8±0.1 ns and τ t1590±100 μs in D 2O). The implications of this with respect to the determination of the quantum yields of singlet oxygen formation in D 2O are discussed.
ISSN:1011-1344
1873-2682
DOI:10.1016/1011-1344(92)85154-M