&lt;title&gt;pH as a relevant factor for sensitizer state and cell photodynamic damage: spectroscopy and microphotometry&lt;/title&gt;

Chernyaeva, Elena B.; Poroshina, Marina Yu.; Zhorina, L. V.; Agronskaya, A. V.; Chikishev, A. Yu.; Schinov, V.A.; Ardgantsev, S. Y.; Gal'pern, M. G.

doi:10.1117/12.197451

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2007

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“…The fluorescence lifetime of AlPcS 2 in PBS is 5.0 ns and is independent of pH. The observed insensitivity to pH is consistent with that of AlPcS 4 in PBS which exhibits a fluorescence lifetime of 4.9 ns over a pH range of 3.0-11.0 (42). The invariance of fluorescence lifetime with pH implies that the rates of radiative and nonradiative de-activation of the first excited singlet state of AlPcS 2 are unaffected by pH.…”

Section: Fluorescence Propertiessupporting

confidence: 74%

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

Ostler¹,

Scully²,

Taylor³

et al. 2007

Photochemistry and Photobiology

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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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Section: Fluorescence Propertiessupporting

confidence: 74%