Effects of substituents and solvents on the photochemical properties of zinc phthalocyanine complexes and their protonated derivatives

Ogunsipe, A. and Nyokong, T. (2004) Effects of substituents and solvents on the photochemical properties of zinc phthalocyanine complexes and their protonated derivatives. Journal of Molecular Structure, 689 (1/2). pp. 89-97. ISSN 0022-2860

[img]
Preview
Text
Nyokong_Effects_of_substituents_and_solvents_on_the_photochemical_properties_of_zinc_phthalocyanine_complexes.pdf

515Kb

Official URL: http://dx.doi.org/10.1016/j.molstruc.2003.10.024

Abstract

Zinc phthalocyanine derivatives containing various ring substituents and axial ligands were studied with respect to the effect of substituents on protonation. Aggregation resulted in failure of some of the ZnPc derivatives to protonate. In fact addition of protonating agents to aggregated ZnPc derivatives resulted in increase in aggregation followed by slow degradation. Axial ligands were lost on protonation. Photobleaching, fluorescence and singlet oxygen quantum yields of the protonated derivatives were compared with those of the unprotonated derivatives. In all cases protonation decreases the singlet oxygen and fluorescence quantum yields. However, photobleaching quantum yields decreased (i.e. stability increased) for the protonated derivatives except when axial ligands were present, where protonation resulted in decrease in stability.

Item Type:Article
Uncontrolled Keywords:Fluorescence; Photobleaching; Protonation; Singlet oxygen; Zinc phthalocyanine
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Chemistry
ID Code:980
Deposited By: Mrs Eileen Shepherd
Deposited On:29 Apr 2008
Last Modified:06 Jan 2012 16:19
851 full-text download(s) since 29 Apr 2008
269 full-text download(s) in the past 12 months
More statistics...

Repository Staff Only: item control page