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Molecules 2016, 21(5), 635; doi:10.3390/molecules21050635

Mechanism of the Zn(II)Phthalocyanines’ Photochemical Reactions Depending on the Number of Substituents and Geometry

1
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970 São Carlos-SP, Brazil
2
Department of Chemistry, Faculty of Science, Gebze Technical University, P. O. Box 141, Gebze, 41400 Kocaeli, Turkey
3
Laboratoire de Chimie de l’ENS de Lyon, CNRS UMR 5182, Université Lyon I, ENS de Lyon, 46 allée d’Italie, 69364 Lyon cedex 07, France
*
Authors to whom correspondence should be addressed.
Academic Editors: M. Graça P. M. S. Neves and M. Amparo F. Faustino
Received: 12 March 2016 / Revised: 28 April 2016 / Accepted: 3 May 2016 / Published: 14 May 2016
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Abstract

In this work, the synthesis and the nonlinear absorption and population dynamics investigation of a series of zinc phthalocyanines (ZnPcs) dissolved in chloroform are reported. In order to determine the relevant spectroscopic parameters, such as absorption cross-sections of singlet and triplet excited states, fluorescence relaxation times, intersystem crossing, radiative decay and internal conversion, different optical and spectroscopic techniques were used. By single pulse and pulse train Z-scan techniques, respectively, singlet and triplet excited states‘ absorption cross-section were determined at 532 nm. Furthermore, the intersystem crossing time was obtained by using both techniques combined with the fluorescence lifetime determined by time-resolved fluorescence. The radiative and internal conversion rates were determined from the fluorescence quantum yield of the samples. Such spectroscopy parameters are fundamental for selecting photosensitizers used in photodynamic therapy, as well as for many other applications. View Full-Text
Keywords: Zn(II)phthalocyanine; optical nonlinearities; luminescence Zn(II)phthalocyanine; optical nonlinearities; luminescence
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Zucolotto Cocca, L.H.; Ayhan, M.M.; Gürek, A.G.; Ahsen, V.; Bretonnière, Y.; de Paula Siqueira, J.; Gotardo, F.; Mendonça, C.R.; Hirel, C.; De Boni, L. Mechanism of the Zn(II)Phthalocyanines’ Photochemical Reactions Depending on the Number of Substituents and Geometry. Molecules 2016, 21, 635.

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