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Solvent effects on the photochemical and （在光化学和溶剂的影响）
Journal of Molecular Structure 650 (2003) 131–140
/locate/molstruc
Solvent effects on the photochemical and fluorescence properties
of zinc phthalocyanine derivatives
Abimbola Ogunsipe, David Maree, Tebello Nyokong*
Department of Chemistry, Rhodes University, P.O. Box 94, Grahamstown 6140, South Africa
Received 10 December 2002; accepted 29 January 2003
Abstract
The effects of solvents on the singlet oxygen, photobleaching and fluorescence quantum yields for zinc phthalocyanine
(ZnPc) and its derivatives; (pyridino)zinc phthalocyanine ((py)ZnPc), zinc octaphenoxyphthalocyanine (ZnOPPc) and zinc
octaestronephthalocyanine (ZnOEPc), is presented. The effects of the solvents on the ground state spectra are also discussed.
The largest red shift of the Q band was observed in aromatic solvents, the highest shift being observed for 1-chloronaphthalene.
Higher singlet fluorescence quantum yields were observed in THF for ZnPc and ZnOPPC. Also in the same solvent
phototransformation rather than photobleaching was observed for ZnOPPc. Split Q band in the emission and excitation spectra
of ZnOPPc was observed in some solvents and this is explained in terms of the lowering of symmetry following excitation.
q 2003 Elsevier Science B.V. All rights reserved.
Keywords: Zinc phthalocyanine; Singlet oxygen; Photobleaching; Fluorecence
1. Introduction positions of MPc complexes is known to influence
the properties of the MPc to a large degree [14–18].
Metallophthalocyanines (MPcs) have been a For instance,
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