Time-resolved spectroscopic studies of sulphonated aluminium phthalocyanine triplet states

Mary S. C. Simpson; A. Beeby; Steven M. Bishop; Alexander J. MacRobert; Andrew W. Parker; David Phillips

doi:10.1117/12.58245

1 April 1992 Time-resolved spectroscopic studies of sulphonated aluminium phthalocyanine triplet states

Mary S. C. Simpson, A. Beeby, Steven M. Bishop, Alexander J. MacRobert, Andrew W. Parker, David Phillips

Proceedings Volume 1640, Time-Resolved Laser Spectroscopy in Biochemistry III; (1992) https://doi.org/10.1117/12.58245
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

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.

Citation Download Citation

Mary S. C. Simpson, A. Beeby, Steven M. Bishop, Alexander J. MacRobert, Andrew W. Parker, and David Phillips "Time-resolved spectroscopic studies of sulphonated aluminium phthalocyanine triplet states", Proc. SPIE 1640, Time-Resolved Laser Spectroscopy in Biochemistry III, (1 April 1992); https://doi.org/10.1117/12.58245

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