The effect of pH on the photophysics and photochemistry of disulphonated aluminum phthalocyanine

The results of a study of the effect of pH on the photophysics and photochemistry of di-sulphonated aluminum phthalocyanine (AlPcS2) in aqueous solution are presented. The pH dependence of the triplet quantum yield, fluorescence quantum yield, singlet-oxygen quantum yield, triplet lifetime, fluoresc...

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Published in:Photochemistry and photobiology 2000-04, Vol.71 (4), p.397-404
Main Authors: Ostler, RB, Scully, AD, Taylor, AG, Gould, IR, Smith, TA, Waite, A, Phillips, D
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container_title Photochemistry and photobiology
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creator Ostler, RB
Scully, AD
Taylor, AG
Gould, IR
Smith, TA
Waite, A
Phillips, D
description The results of a study of the effect of pH on the photophysics and photochemistry of di-sulphonated aluminum phthalocyanine (AlPcS2) in aqueous solution are presented. The pH dependence of the triplet quantum yield, fluorescence quantum yield, singlet-oxygen quantum yield, triplet lifetime, fluorescence lifetime and apparent dimerization constants is investigated and the results interpreted in terms of the pH dependence of the nature of the axial ligands. Evidence that the aluminum-axial ligand bond strength, rather than dimer binding energy that determines the extent of dimerization is provided by semi-empirical and ab initio calculations. Possible dimer structures obtained using ab initio calculations are discussed.
doi_str_mv 10.1562/0031-8655(2000)071<0397:TEOPOT>2.0.CO;2
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title The effect of pH on the photophysics and photochemistry of disulphonated aluminum phthalocyanine
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