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

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 excit...

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Autores principales: Zucolotto Cocca, Leandro Henrique, Ayhan, Mehmet Menaf, Gürek, Ayşe Gül, Ahsen, Vefa, Bretonnière, Yann, de Paula Siqueira, Jonathas, Gotardo, Fernando, Mendonça, Cleber Renato, Hirel, Catherine, De Boni, Leonardo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6274317/
https://www.ncbi.nlm.nih.gov/pubmed/27187343
http://dx.doi.org/10.3390/molecules21050635
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author Zucolotto Cocca, Leandro Henrique
Ayhan, Mehmet Menaf
Gürek, Ayşe Gül
Ahsen, Vefa
Bretonnière, Yann
de Paula Siqueira, Jonathas
Gotardo, Fernando
Mendonça, Cleber Renato
Hirel, Catherine
De Boni, Leonardo
author_facet Zucolotto Cocca, Leandro Henrique
Ayhan, Mehmet Menaf
Gürek, Ayşe Gül
Ahsen, Vefa
Bretonnière, Yann
de Paula Siqueira, Jonathas
Gotardo, Fernando
Mendonça, Cleber Renato
Hirel, Catherine
De Boni, Leonardo
author_sort Zucolotto Cocca, Leandro Henrique
collection PubMed
description 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.
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spelling pubmed-62743172018-12-28 Mechanism of the Zn(II)Phthalocyanines’ Photochemical Reactions Depending on the Number of Substituents and Geometry Zucolotto Cocca, Leandro Henrique Ayhan, Mehmet Menaf Gürek, Ayşe Gül Ahsen, Vefa Bretonnière, Yann de Paula Siqueira, Jonathas Gotardo, Fernando Mendonça, Cleber Renato Hirel, Catherine De Boni, Leonardo Molecules Article 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. MDPI 2016-05-14 /pmc/articles/PMC6274317/ /pubmed/27187343 http://dx.doi.org/10.3390/molecules21050635 Text en © 2016 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zucolotto Cocca, Leandro Henrique
Ayhan, Mehmet Menaf
Gürek, Ayşe Gül
Ahsen, Vefa
Bretonnière, Yann
de Paula Siqueira, Jonathas
Gotardo, Fernando
Mendonça, Cleber Renato
Hirel, Catherine
De Boni, Leonardo
Mechanism of the Zn(II)Phthalocyanines’ Photochemical Reactions Depending on the Number of Substituents and Geometry
title Mechanism of the Zn(II)Phthalocyanines’ Photochemical Reactions Depending on the Number of Substituents and Geometry
title_full Mechanism of the Zn(II)Phthalocyanines’ Photochemical Reactions Depending on the Number of Substituents and Geometry
title_fullStr Mechanism of the Zn(II)Phthalocyanines’ Photochemical Reactions Depending on the Number of Substituents and Geometry
title_full_unstemmed Mechanism of the Zn(II)Phthalocyanines’ Photochemical Reactions Depending on the Number of Substituents and Geometry
title_short Mechanism of the Zn(II)Phthalocyanines’ Photochemical Reactions Depending on the Number of Substituents and Geometry
title_sort mechanism of the zn(ii)phthalocyanines’ photochemical reactions depending on the number of substituents and geometry
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6274317/
https://www.ncbi.nlm.nih.gov/pubmed/27187343
http://dx.doi.org/10.3390/molecules21050635
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