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Synthesis, photophysics and photochemistry of novel tetra(quinoxalinyl)phthalocyaninato zinc(II) complexes

Paper ID Volume ID Publish Year Pages File Format Full-Text
28207 44065 2009 7 PDF Available
Title
Synthesis, photophysics and photochemistry of novel tetra(quinoxalinyl)phthalocyaninato zinc(II) complexes
Abstract

The syntheses and spectral, photophysical and photochemical properties of some zinc phthalocyanine derivatives – {2, (3)-tetra(quinoxalinyl)phthalocyaninato zinc(II), (β-ZnPc) and 1, (4)-tetra(quinoxalinyl)phthalocyaninato zinc(II), (α-ZnPc)} – are presented. The β-substituted complex is more fluorescent and exhibits lower tendencies to undergo intersystem crossing than its α-substituted counterpart, as judged by the former's higher fluorescence quantum yield (ΦF) and lower triplet quantum yield (ΦT) than the latter's in three solvents (DMSO, DMF and toluene). Singlet oxygen quantum yield (ΦΔ) values show the same trends as ΦT values. The differences in the spectral and photophysical properties of α-ZnPc and β-ZnPc are partly attributed to greater molecular distortions in the former. Studies of the interaction of the triplet states of α-ZnPc and β-ZnPc with triplet oxygen showed that α-ZnPc is more vulnerable to oxygen quenching than β-ZnPc. Also, the smallest quenching rate constants were observed in DMSO, which is attributed to the higher viscosity of DMSO than DMF and toluene.

Keywords
Phthalocyanine; Photodynamic therapy; Non-planar distortion; Quantum yield; Singlet oxygen; Quenching
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Synthesis, photophysics and photochemistry of novel tetra(quinoxalinyl)phthalocyaninato zinc(II) complexes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 205, Issue 1, 10 June 2009, Pages 12–18
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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