Solution and surface photochemistry of fenarimol: A comparative study
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/5056 https://doi.org/10.1016/j.jphotochem.2006.08.018 |
Resumo: | The photochemistry of the pesticide fenarimol was studied in methanol and on a cellulose surface. The ground state absorption and fluorescence spectra are similar in solution and at the solid/gas interface. Room temperature phosphorescence emission was observed in cellulose. Transient absorption of fenarimol and of its chromophoric units, chlorobenzene and pyrimidine, showed a common absorption band centered at 320 nm in methanol. An absorption band above 350 nm was observed only for fenarimol and was assigned to a recombination intermediate. On cellulose the transient absorption is broader and extends up to 600 nm. The main photodegradation pathway in methanol involves the homolytic cleavage of the bond to the pyrimidyl ring, followed by a fast in-cage recombination of the initially formed pyrimidine and ketyl radicals. On cellulose surfaces, dechlorination is also one of the important photodegradation pathways. |
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Solution and surface photochemistry of fenarimol: A comparative studyLaser flash photolysisDiffuse reflectancePhotodegradation productsChlorobenzenePyrimidineThe photochemistry of the pesticide fenarimol was studied in methanol and on a cellulose surface. The ground state absorption and fluorescence spectra are similar in solution and at the solid/gas interface. Room temperature phosphorescence emission was observed in cellulose. Transient absorption of fenarimol and of its chromophoric units, chlorobenzene and pyrimidine, showed a common absorption band centered at 320 nm in methanol. An absorption band above 350 nm was observed only for fenarimol and was assigned to a recombination intermediate. On cellulose the transient absorption is broader and extends up to 600 nm. The main photodegradation pathway in methanol involves the homolytic cleavage of the bond to the pyrimidyl ring, followed by a fast in-cage recombination of the initially formed pyrimidine and ketyl radicals. On cellulose surfaces, dechlorination is also one of the important photodegradation pathways.http://www.sciencedirect.com/science/article/B6TGY-4KSH9VC-5/1/95f111d30a1148f829b59c29c1e78d3c2007info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/5056http://hdl.handle.net/10316/5056https://doi.org/10.1016/j.jphotochem.2006.08.018engJournal of Photochemistry and Photobiology A: Chemistry. 186:2-3 (2007) 278-282Silva, José P. daMateus, M. Conceição D. A.Silva, Abílio M. daFerreira, Luís F. VieiraBurrows, Hugh D.info: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:RCAAP2020-11-06T16:49:11Zoai:estudogeral.uc.pt:10316/5056Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:01:34.222941Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Solution and surface photochemistry of fenarimol: A comparative study |
title |
Solution and surface photochemistry of fenarimol: A comparative study |
spellingShingle |
Solution and surface photochemistry of fenarimol: A comparative study Silva, José P. da Laser flash photolysis Diffuse reflectance Photodegradation products Chlorobenzene Pyrimidine |
title_short |
Solution and surface photochemistry of fenarimol: A comparative study |
title_full |
Solution and surface photochemistry of fenarimol: A comparative study |
title_fullStr |
Solution and surface photochemistry of fenarimol: A comparative study |
title_full_unstemmed |
Solution and surface photochemistry of fenarimol: A comparative study |
title_sort |
Solution and surface photochemistry of fenarimol: A comparative study |
author |
Silva, José P. da |
author_facet |
Silva, José P. da Mateus, M. Conceição D. A. Silva, Abílio M. da Ferreira, Luís F. Vieira Burrows, Hugh D. |
author_role |
author |
author2 |
Mateus, M. Conceição D. A. Silva, Abílio M. da Ferreira, Luís F. Vieira Burrows, Hugh D. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Silva, José P. da Mateus, M. Conceição D. A. Silva, Abílio M. da Ferreira, Luís F. Vieira Burrows, Hugh D. |
dc.subject.por.fl_str_mv |
Laser flash photolysis Diffuse reflectance Photodegradation products Chlorobenzene Pyrimidine |
topic |
Laser flash photolysis Diffuse reflectance Photodegradation products Chlorobenzene Pyrimidine |
description |
The photochemistry of the pesticide fenarimol was studied in methanol and on a cellulose surface. The ground state absorption and fluorescence spectra are similar in solution and at the solid/gas interface. Room temperature phosphorescence emission was observed in cellulose. Transient absorption of fenarimol and of its chromophoric units, chlorobenzene and pyrimidine, showed a common absorption band centered at 320 nm in methanol. An absorption band above 350 nm was observed only for fenarimol and was assigned to a recombination intermediate. On cellulose the transient absorption is broader and extends up to 600 nm. The main photodegradation pathway in methanol involves the homolytic cleavage of the bond to the pyrimidyl ring, followed by a fast in-cage recombination of the initially formed pyrimidine and ketyl radicals. On cellulose surfaces, dechlorination is also one of the important photodegradation pathways. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007 |
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 |
http://hdl.handle.net/10316/5056 http://hdl.handle.net/10316/5056 https://doi.org/10.1016/j.jphotochem.2006.08.018 |
url |
http://hdl.handle.net/10316/5056 https://doi.org/10.1016/j.jphotochem.2006.08.018 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Photochemistry and Photobiology A: Chemistry. 186:2-3 (2007) 278-282 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
aplication/PDF |
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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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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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