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Proceedings Paper

Time-resolved spectroscopic studies of sulphonated aluminium phthalocyanine triplet states
Author(s): Mary S. C. Simpson; A. Beeby; Steven M. Bishop; Alexander J. MacRobert; Andrew W. Parker; David Phillips
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Paper Abstract

The photophysical and photochemical properties of sulphonated aluminum and zinc phthalocyanines have been investigated in a range of solvents and model biological systems. Anomalous effects are observed upon deuteration of the solvent and addition of fluoride ions. In D2O the excited singlet and triplet state lifetimes and quantum yields of fluorescence and triplet state formation are increased relative to H2O. No solvent isotope effect is observed between CH3OH and CH3OD. It is proposed that relaxation of the excited state involves a tunnelling type interaction in which the phthalocyanine's highly energetic metal-axial ligand stretching vibrations are coupled to the HO-H or DO-D stretching vibrations. A significant increase in triplet lifetimes of phthalocyanine sensitizers bound to protein substrates is observed which is a function of the degree of sulphonation. The implications of these results to the determination of the quantum yields of singlet oxygen formation in D2O and lipophilic environments are discussed.

Paper Details

Date Published: 1 April 1992
PDF: 10 pages
Proc. SPIE 1640, Time-Resolved Laser Spectroscopy in Biochemistry III, (1 April 1992); doi: 10.1117/12.58245
Show Author Affiliations
Mary S. C. Simpson, Imperial College of Science, Technology and Medicine (United Kingdom)
A. Beeby, Imperial College of Science, Technology and Medicine (United Kingdom)
Steven M. Bishop, Imperial College of Science, Technology and Medicine (United Kingdom)
Alexander J. MacRobert, Imperial College of Science, Technology and Medicine (United Kingdom)
Andrew W. Parker, Rutherford Appleton Lab. (United Kingdom)
David Phillips, Imperial College of Science, Technology and Medicine (United Kingdom)


Published in SPIE Proceedings Vol. 1640:
Time-Resolved Laser Spectroscopy in Biochemistry III
Joseph R. Lakowicz, Editor(s)

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