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The Effect of pH on the Photophysics and Photochemistry of Di‐sulphonated Aluminum Phthalocyanine
Author(s) -
Ostler R. B.,
Scully A. D.,
Taylor A. G.,
Gould I. R.,
Smith T. A.,
Waite A.,
Phillips D.
Publication year - 2000
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1562/0031-8655(2000)0710397teopot2.0.co2
Subject(s) - phthalocyanine , photochemistry , chemistry , aluminium , organic chemistry
The results of a study of the effect of pH on the photophysics and photochemistry of di‐sulphonated aluminum phthalocyanine (AlPcS 2 ) 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.