Cargando…
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...
Autores principales: | , , , , , , , , , |
---|---|
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 |
_version_ | 1783377590671638528 |
---|---|
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. |
format | Online Article Text |
id | pubmed-6274317 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT zucolottococcaleandrohenrique mechanismofthezniiphthalocyaninesphotochemicalreactionsdependingonthenumberofsubstituentsandgeometry AT ayhanmehmetmenaf mechanismofthezniiphthalocyaninesphotochemicalreactionsdependingonthenumberofsubstituentsandgeometry AT gurekaysegul mechanismofthezniiphthalocyaninesphotochemicalreactionsdependingonthenumberofsubstituentsandgeometry AT ahsenvefa mechanismofthezniiphthalocyaninesphotochemicalreactionsdependingonthenumberofsubstituentsandgeometry AT bretonniereyann mechanismofthezniiphthalocyaninesphotochemicalreactionsdependingonthenumberofsubstituentsandgeometry AT depaulasiqueirajonathas mechanismofthezniiphthalocyaninesphotochemicalreactionsdependingonthenumberofsubstituentsandgeometry AT gotardofernando mechanismofthezniiphthalocyaninesphotochemicalreactionsdependingonthenumberofsubstituentsandgeometry AT mendoncacleberrenato mechanismofthezniiphthalocyaninesphotochemicalreactionsdependingonthenumberofsubstituentsandgeometry AT hirelcatherine mechanismofthezniiphthalocyaninesphotochemicalreactionsdependingonthenumberofsubstituentsandgeometry AT debonileonardo mechanismofthezniiphthalocyaninesphotochemicalreactionsdependingonthenumberofsubstituentsandgeometry |