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Probing metal cations with two new Schiff base bischromophoric pyrene based chemosensors: Synthesis, photophysics and interactions patterns

Catherine De Castro Orcid Logo, Tânia F.G.G. Cova, Alberto C.C. Pais, Daniela Pinheiro, Cristina Nuñez, Carlos Lodeiro, J. Sérgio Seixas de Melo

Dyes and Pigments, Volume: 134, Pages: 601 - 612

Swansea University Author: Catherine De Castro Orcid Logo

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DOI (Published version): 10.1016/j.dyepig.2016.08.016

Abstract

Two new pyrene chemosensors (bipyrenyl ligands L1 and L2) have been synthesized, fully characterized and their sensing ability towards metal cations (Cu2+, Ag+, Pb2+, Zn2+, Cd2+ and Hg2+) has been investigated by absorption and fluorescence (steady-state and time-resolved) techniques in solution. Th...

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Published in: Dyes and Pigments
ISSN: 0143-7208
Published: 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa40146
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spelling 2018-05-15T15:13:37.6017397 v2 40146 2018-05-14 Probing metal cations with two new Schiff base bischromophoric pyrene based chemosensors: Synthesis, photophysics and interactions patterns 9523c09d78056932bb9b6959b559323e 0000-0003-0649-3427 Catherine De Castro Catherine De Castro true false 2018-05-14 EEN Two new pyrene chemosensors (bipyrenyl ligands L1 and L2) have been synthesized, fully characterized and their sensing ability towards metal cations (Cu2+, Ag+, Pb2+, Zn2+, Cd2+ and Hg2+) has been investigated by absorption and fluorescence (steady-state and time-resolved) techniques in solution. The absorption spectra of the two free ligands displays a single band (attributed to the monomer absorption) whereas the emission spectra show two bands, which were attributed to the emission of the monomer and dimer. For L1, time-resolved fluorescence measurements indicate the presence of a single component that becomes double exponential when the metal ion (in the investigated case, Pb2+) is added. From both steady-state and time-resolved data it is concluded that this dimer likely involves the interaction of two pyrene units, but the absence of a rising component in the fluorescence decays discards the possibility of the presence of a dynamic excimer. Upon addition of a metal ion, this band changes in shape mirroring the fact that a new complex, involving the metal ion and the ligand, is formed. From the overall spectroscopic and photophysical data rationalized by Hierarchical Cluster Analysis (HCA) and Principal Component Analysis (PCA) it was concluded that both L1 and L2 ligands are able to discriminate Ag+ and Pb2+ from all the other metal ions, with L2 displaying a higher sensing ability (as seen from HCA/PCA analysis) towards Pb2+. This global approach, joining spectral and photophysical data with multivariate analysis, has shown to constitute a powerful tool for revealing important patterns in this type of system. Journal Article Dyes and Pigments 134 601 612 0143-7208 Pyrene, Chemosensors, Time-resolved fluorescence, Sensing ability, PCA, HCA 31 12 2016 2016-12-31 10.1016/j.dyepig.2016.08.016 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2018-05-15T15:13:37.6017397 2018-05-14T14:58:14.4924005 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Catherine De Castro 0000-0003-0649-3427 1 Tânia F.G.G. Cova 2 Alberto C.C. Pais 3 Daniela Pinheiro 4 Cristina Nuñez 5 Carlos Lodeiro 6 J. Sérgio Seixas de Melo 7
title Probing metal cations with two new Schiff base bischromophoric pyrene based chemosensors: Synthesis, photophysics and interactions patterns
spellingShingle Probing metal cations with two new Schiff base bischromophoric pyrene based chemosensors: Synthesis, photophysics and interactions patterns
Catherine De Castro
title_short Probing metal cations with two new Schiff base bischromophoric pyrene based chemosensors: Synthesis, photophysics and interactions patterns
title_full Probing metal cations with two new Schiff base bischromophoric pyrene based chemosensors: Synthesis, photophysics and interactions patterns
title_fullStr Probing metal cations with two new Schiff base bischromophoric pyrene based chemosensors: Synthesis, photophysics and interactions patterns
title_full_unstemmed Probing metal cations with two new Schiff base bischromophoric pyrene based chemosensors: Synthesis, photophysics and interactions patterns
title_sort Probing metal cations with two new Schiff base bischromophoric pyrene based chemosensors: Synthesis, photophysics and interactions patterns
author_id_str_mv 9523c09d78056932bb9b6959b559323e
author_id_fullname_str_mv 9523c09d78056932bb9b6959b559323e_***_Catherine De Castro
author Catherine De Castro
author2 Catherine De Castro
Tânia F.G.G. Cova
Alberto C.C. Pais
Daniela Pinheiro
Cristina Nuñez
Carlos Lodeiro
J. Sérgio Seixas de Melo
format Journal article
container_title Dyes and Pigments
container_volume 134
container_start_page 601
publishDate 2016
institution Swansea University
issn 0143-7208
doi_str_mv 10.1016/j.dyepig.2016.08.016
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 0
active_str 0
description Two new pyrene chemosensors (bipyrenyl ligands L1 and L2) have been synthesized, fully characterized and their sensing ability towards metal cations (Cu2+, Ag+, Pb2+, Zn2+, Cd2+ and Hg2+) has been investigated by absorption and fluorescence (steady-state and time-resolved) techniques in solution. The absorption spectra of the two free ligands displays a single band (attributed to the monomer absorption) whereas the emission spectra show two bands, which were attributed to the emission of the monomer and dimer. For L1, time-resolved fluorescence measurements indicate the presence of a single component that becomes double exponential when the metal ion (in the investigated case, Pb2+) is added. From both steady-state and time-resolved data it is concluded that this dimer likely involves the interaction of two pyrene units, but the absence of a rising component in the fluorescence decays discards the possibility of the presence of a dynamic excimer. Upon addition of a metal ion, this band changes in shape mirroring the fact that a new complex, involving the metal ion and the ligand, is formed. From the overall spectroscopic and photophysical data rationalized by Hierarchical Cluster Analysis (HCA) and Principal Component Analysis (PCA) it was concluded that both L1 and L2 ligands are able to discriminate Ag+ and Pb2+ from all the other metal ions, with L2 displaying a higher sensing ability (as seen from HCA/PCA analysis) towards Pb2+. This global approach, joining spectral and photophysical data with multivariate analysis, has shown to constitute a powerful tool for revealing important patterns in this type of system.
published_date 2016-12-31T03:51:06Z
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