Hybrid sol-gel matrices doped with colorimetric/fluorimetric imidazole derivatives
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | https://hdl.handle.net/1822/77918 |
Resumo: | Organic–inorganic hybrids (OIH) are materials that can be easily synthesized by the sol–gel method and combine the advantages of organic and inorganic moieties within a single polymeric matrix. Imidazole derivatives are versatile organic compounds that can change their optical properties with the variation of pH due to the protonation or deprotonation of the nitrogen atoms. This work reports the preparation of different OIHs doped with different contents of two imidazole compounds (<b>3a</b>,<b>b</b>). The obtained materials were characterized structurally by FTIR, and the dielectric properties were studied by electrochemical impedance spectroscopy. The optical properties were studied by UV-Vis absorption and fluorescence spectroscopies. The FTIR analysis showed that the presence of the imidazole does not change the structural properties of the matrices. The normalized resistance values obtained for the doped matrices ranged between 8.57 and 9.32 Ω cm<sup>2</sup>, all being higher than the undoped matrix. The σ ranged between 9.49 and 10.28 S cm<sup>−1</sup>, being all higher than the pure OIH samples. Compound <b>3a</b> showed a maximum absorption peak at 390 nm, which is present in the OIH spectra, proving the presence of the compound. In the case of compound <b>3b</b>, a maximum absorption wavelength at 412 nm was found, and the compound peak was not clear, which may indicate that an interaction between the compound and the matrix occurred. A synergetic effect between the intrinsic emission of the matrix and the fluorescence of <b>3a</b> is found on the OIH-doped matrices. |
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Hybrid sol-gel matrices doped with colorimetric/fluorimetric imidazole derivativesOrganic-inorganic hybridSol-gelImidazole derivativesFluorescenceColorimetryScience & TechnologyOrganic–inorganic hybrids (OIH) are materials that can be easily synthesized by the sol–gel method and combine the advantages of organic and inorganic moieties within a single polymeric matrix. Imidazole derivatives are versatile organic compounds that can change their optical properties with the variation of pH due to the protonation or deprotonation of the nitrogen atoms. This work reports the preparation of different OIHs doped with different contents of two imidazole compounds (<b>3a</b>,<b>b</b>). The obtained materials were characterized structurally by FTIR, and the dielectric properties were studied by electrochemical impedance spectroscopy. The optical properties were studied by UV-Vis absorption and fluorescence spectroscopies. The FTIR analysis showed that the presence of the imidazole does not change the structural properties of the matrices. The normalized resistance values obtained for the doped matrices ranged between 8.57 and 9.32 Ω cm<sup>2</sup>, all being higher than the undoped matrix. The σ ranged between 9.49 and 10.28 S cm<sup>−1</sup>, being all higher than the pure OIH samples. Compound <b>3a</b> showed a maximum absorption peak at 390 nm, which is present in the OIH spectra, proving the presence of the compound. In the case of compound <b>3b</b>, a maximum absorption wavelength at 412 nm was found, and the compound peak was not clear, which may indicate that an interaction between the compound and the matrix occurred. A synergetic effect between the intrinsic emission of the matrix and the fluorescence of <b>3a</b> is found on the OIH-doped matrices.This research was funded by Fundação para a Ciência e Tecnologia (FCT) and FEDER (European Fund for Regional Development)-COMPETE-QRENEU through the Chemistry Research Centre of the University of Minho (Ref. CQ/UM (UID/QUI/00686/2019 and UID/QUI/00686/2020), project “SolSensors—Development of Advanced Fiber Optic Sensors for Monitoring the Durability of Concrete Structures”, reference POCI-01-0145-FEDER-031220, and a PhD grant to R.P.C.L. Sousa (SFRH/BD/145639/2019). The NMR spectrometer Bruker Avance III 400 is part of the National NMR Network (PTNMR) and partially supported by Infrastructure Project No 022161 (co-financed by FEDER through COMPETE 2020, POCI and PORL and FCT through PIDDAC).Multidisciplinary Digital Publishing Institute (MDPI)Universidade do MinhoSousa, Rui Pedro Carvalho LimaFigueira, Rita BacelarGomes, Bárbara R.Sousa, SaraFerreira, R. Cristina M.Costa, Susana P. G.Raposo, M. Manuela M.2021-12-152021-12-15T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/1822/77918engSousa, R.P.C.L.; Figueira, R.B.; Gomes, B.R.; Sousa, S.; Ferreira, R.C.M.; Costa, S.P.G.; Raposo, M.M.M. Hybrid Sol–Gel Matrices Doped with Colorimetric/Fluorimetric Imidazole Derivatives. Nanomaterials 2021, 11, 3401. https://doi.org/10.3390/nano111234012079-499110.3390/nano111234013401https://www.mdpi.com/2079-4991/11/12/3401info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T11:58:05ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
Hybrid sol-gel matrices doped with colorimetric/fluorimetric imidazole derivatives |
title |
Hybrid sol-gel matrices doped with colorimetric/fluorimetric imidazole derivatives |
spellingShingle |
Hybrid sol-gel matrices doped with colorimetric/fluorimetric imidazole derivatives Sousa, Rui Pedro Carvalho Lima Organic-inorganic hybrid Sol-gel Imidazole derivatives Fluorescence Colorimetry Science & Technology |
title_short |
Hybrid sol-gel matrices doped with colorimetric/fluorimetric imidazole derivatives |
title_full |
Hybrid sol-gel matrices doped with colorimetric/fluorimetric imidazole derivatives |
title_fullStr |
Hybrid sol-gel matrices doped with colorimetric/fluorimetric imidazole derivatives |
title_full_unstemmed |
Hybrid sol-gel matrices doped with colorimetric/fluorimetric imidazole derivatives |
title_sort |
Hybrid sol-gel matrices doped with colorimetric/fluorimetric imidazole derivatives |
author |
Sousa, Rui Pedro Carvalho Lima |
author_facet |
Sousa, Rui Pedro Carvalho Lima Figueira, Rita Bacelar Gomes, Bárbara R. Sousa, Sara Ferreira, R. Cristina M. Costa, Susana P. G. Raposo, M. Manuela M. |
author_role |
author |
author2 |
Figueira, Rita Bacelar Gomes, Bárbara R. Sousa, Sara Ferreira, R. Cristina M. Costa, Susana P. G. Raposo, M. Manuela M. |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Sousa, Rui Pedro Carvalho Lima Figueira, Rita Bacelar Gomes, Bárbara R. Sousa, Sara Ferreira, R. Cristina M. Costa, Susana P. G. Raposo, M. Manuela M. |
dc.subject.por.fl_str_mv |
Organic-inorganic hybrid Sol-gel Imidazole derivatives Fluorescence Colorimetry Science & Technology |
topic |
Organic-inorganic hybrid Sol-gel Imidazole derivatives Fluorescence Colorimetry Science & Technology |
description |
Organic–inorganic hybrids (OIH) are materials that can be easily synthesized by the sol–gel method and combine the advantages of organic and inorganic moieties within a single polymeric matrix. Imidazole derivatives are versatile organic compounds that can change their optical properties with the variation of pH due to the protonation or deprotonation of the nitrogen atoms. This work reports the preparation of different OIHs doped with different contents of two imidazole compounds (<b>3a</b>,<b>b</b>). The obtained materials were characterized structurally by FTIR, and the dielectric properties were studied by electrochemical impedance spectroscopy. The optical properties were studied by UV-Vis absorption and fluorescence spectroscopies. The FTIR analysis showed that the presence of the imidazole does not change the structural properties of the matrices. The normalized resistance values obtained for the doped matrices ranged between 8.57 and 9.32 Ω cm<sup>2</sup>, all being higher than the undoped matrix. The σ ranged between 9.49 and 10.28 S cm<sup>−1</sup>, being all higher than the pure OIH samples. Compound <b>3a</b> showed a maximum absorption peak at 390 nm, which is present in the OIH spectra, proving the presence of the compound. In the case of compound <b>3b</b>, a maximum absorption wavelength at 412 nm was found, and the compound peak was not clear, which may indicate that an interaction between the compound and the matrix occurred. A synergetic effect between the intrinsic emission of the matrix and the fluorescence of <b>3a</b> is found on the OIH-doped matrices. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-12-15 2021-12-15T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://hdl.handle.net/1822/77918 |
url |
https://hdl.handle.net/1822/77918 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Sousa, R.P.C.L.; Figueira, R.B.; Gomes, B.R.; Sousa, S.; Ferreira, R.C.M.; Costa, S.P.G.; Raposo, M.M.M. Hybrid Sol–Gel Matrices Doped with Colorimetric/Fluorimetric Imidazole Derivatives. Nanomaterials 2021, 11, 3401. https://doi.org/10.3390/nano11123401 2079-4991 10.3390/nano11123401 3401 https://www.mdpi.com/2079-4991/11/12/3401 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Multidisciplinary Digital Publishing Institute (MDPI) |
publisher.none.fl_str_mv |
Multidisciplinary Digital Publishing Institute (MDPI) |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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1777303653105795072 |