The Effect of pH on the Photophysics and Photochemistry of Di-sulphonated Aluminum Phthalocyanine

R. B. Ostler; A. D. Scully; A. G. Taylor; I. R. Gould; T. A. Smith; A. Waite; D. Phillips

doi:10.1562/0031-8655(2000)071<0397:TEOPOT>2.0.CO;2

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1 April 2000 The Effect of pH on the Photophysics and Photochemistry of Di-sulphonated Aluminum Phthalocyanine

R. B. Ostler, A. D. Scully, A. G. Taylor, I. R. Gould, T. A. Smith, A. Waite, D. Phillips

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Photochemistry and Photobiology, 71(4):397-404 (2000). https://doi.org/10.1562/0031-8655(2000)071<0397:TEOPOT>2.0.CO;2

Abstract

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.

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R. B. Ostler, A. D. Scully, A. G. Taylor, I. R. Gould, T. A. Smith, A. Waite, and D. Phillips "The Effect of pH on the Photophysics and Photochemistry of Di-sulphonated Aluminum Phthalocyanine," Photochemistry and Photobiology 71(4), 397-404, (1 April 2000). https://doi.org/10.1562/0031-8655(2000)071<0397:TEOPOT>2.0.CO;2

Received: 19 November 1999; Accepted: 1 January 2000; Published: 1 April 2000

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