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Estudo fotoqu?mico de nanocristais de chalcona e seus derivados fluorados / Photochemical study of chalcone and its fluorinated derivatives in the nanocrystalline state

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Previous issue date: 2016-11-19 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The photochemical reactivity of chalcone (CH) nanocrystals and its fluorinated derivatives (CH4F, CH23F, CH25F, CH26F, CH34F, CH35F, PFCB and the DFC) in a suspension of aqueous CTAB (0.04 mM) was studied by ultraviolet spectroscopy (UV), hydrogen nuclear magnetic resonance (H1NMR) and dynamic light scattering (DLS). The suspension of chalcone nanocrystals was prepared by the reprecipitation method in an aqueous solution of CTAB. The ultraviolet spectrum for the chalcone nanocrystals prior to irradiation showed hypochromic and bathochromic effects when compared to the methanolic solution. The DLS spectrum for CH CH23F, CH25F, CH26F and PFCB nanocrystals in aqueous CTAB showed a polydispersed system containing three different particle sizes, whereas CH34F, CH35F and DFC nanocrystals showed a clear monodispersivity. After irradiation, the DLS spectrum for these nanocrystals did not show significant changes, however for the monodispersed chalcones a shift towards larger particle sizes was observed. After irradiation the UV spectrum for the chalcone nanocrystals indicated a hypochromic effect on the longer wavelength band, which may be related to the consumption of their E-isomer. The kinetic monitoring of the E-isomer consumption for the chalcones CH, CH4F, CH23F, CH25F, CH26F CH34F, CH35F, PFCB and DFC as a function of irradiation time indicated that after a certain time the reaction reaches a steady state, with no more changes on their absorbance. The H1NMR spectrum for the irradiation product of CH4F and CH23F showed the formation of a mixture of ?-, ??-, and ?-truxillic dimers. On the other hand, irradiation of CH25F and CH26F derivatives led to the formation of the ?-truxinic dimer. Photolysis of CH34F and CH35F nanocrystals showed the conversion of the reactant to a cyclobutane through a stereospecific reaction. For CH35F only the ?-truxillic dimer has been formed, in nearly 100% conversion. However, for nanocrystals of the chalcone CH34F the Z-isomer is formed together with the ?-truxillic dimer CH34F, which may be related to a chalcone fraction that was solubilized in the CTAB containing aqueous phase. Irradiation of DFC nanocrystals occurred at a conversion of almost 100% to the cycloaddition product, the ?-truxillic dimer. For chalcone (CH) a high yield formation of the Z-chalcone isomer and dimers that are not formed from its E-isomer was observed, while PFCB appeared as a stable molecule during the irradiation process, and the presence of the five fluorine atoms on the benzyl ring can account for its stability / A reatividade fotoqu?mica de nanocristais de chalcona (CH) e seus derivados fluorados (CH4F, CH23F, CH25F, CH26F, CH34F, CH35F, PFCB e DFC) foi estudada por espectroscopia de ultravioleta (UV), Resson?ncia magn?tica nuclear de hidrog?nio (RMN1H) e Espalhamento de luz din?mico (DLS). A suspens?o dos nanocristais das chalconas foi preparada pelo m?todo de reprecipita??o em uma solu??o aquosa de CTAB. Os espectros no ultravioleta para a suspens?o dos nanocristais das chalconas antes da irradia??o mostraram um efeito hipocr?mico e batocr?mico em rela??o ? solu??o metan?lica. Os espectros de DLS para os nanocristais da suspens?o das chalconas em solu??o aquosa de CTAB se apresentaram como um sistema polidisperso apresentando 3 tamanhos de part?culas para CH, CH23F, CH25F, CH26F, PFCB e monodisperso para CH34F, CH35F e DFC. Ap?s a irradia??o n?o se observou mudan?as significativas na estrutura dos espectros de DLS para os nanocristais, ocorrendo um deslocamento para tamanhos de part?culas maiores nas chalconas monodispersas. O espectro de UV para a suspens?o dos nanocristais das chalconas ap?s a irradia??o indicou um efeito hipocr?mico da banda de maior absor??o, o que pode estar relacionado ao consumo dos compostos de configura??o E.
O acompanhamento cin?tico do consumo do is?mero E das chalconas CH, CH4F, CH23F, CH25F, CH26F CH34F, CH35F, PFCB e DFC contra tempo de irradia??o de uma suspens?o dos nanocristais destas chalconas em solu??o aquosa de CTAB (0,04 mM) indicou que a partir de um determinado tempo a rea??o atinge um estado estacion?rio, n?o apresentando mais mudan?as em sua absorb?ncia. Os espectros de RMN1H para o produto da irradia??o dos nanocristais das chalconas contendo fl?or na posi??o 4 (CH4F) e nas posi??es 2 e 3 (CH23F) mostraram a forma??o de uma mistura de d?meros ?????? e ?-trux?licos. A irradia??o dos derivados CH25F e CH26F levou ? forma??o do d?mero do tipo ?-trux?nico. Para os derivados CH34F e CH35F a convers?o dos reagentes ao fotociclobutano foi feita em uma forma estereoespec?fica, tendo sido formado somente o d?mero ?-trux?lico, com uma convers?o de quase 100% para o CH35F. No entanto, para os nanocristais da chalcona CH34F o is?mero Z-CH34F foi formado juntamente com o d?mero ?-trux?lico, o que pode estar relacionado a fra??es da chalcona que ficaram solubilizadas na fase aquosa contendo CTAB e n?o formaram suspens?o de nanocristais.
A irradia??o dos nanocristais da chalcona DFC ocorreu com uma convers?o de quase 100% ao produto de fotocicloadi??o, sendo o d?mero formado o do tipo ?-trux?lico. Para chalcona (CH) observou-se um elevado rendimento de forma??o do is?mero Z-chalcona e de d?meros que n?o s?o provenientes do is?mero E, enquanto que PFCB apresentou-se como uma mol?cula est?vel durante o processo de irradia??o, com a presen?a dos cinco ?tomos de fl?or no anel benz?lico podendo ser respons?vel pela sua estabilidade

Identiferoai:union.ndltd.org:IBICT/oai:localhost:jspui/1607
Date19 November 2016
CreatorsBarros, Leonardo Santos de
ContributorsFerreira, Jos? Carlos Netto, Cesarin Sobrinho, Dar?, Cavalheiro, Carla Cristina Schmidt, Correia, Rodrigo Jos?, Ferreira, Aur?lio Baird Buarque, Silva, Francisco de Assis da, Garden, Nanci C?mara de Lucas
PublisherUniversidade Federal Rural do Rio de Janeiro, Programa de P?s-Gradua??o em Qu?mica, UFRRJ, Brasil, Instituto de Ci?ncias Exatas
Source SetsIBICT Brazilian ETDs
LanguagePortuguese
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis
Formatapplication/pdf
Sourcereponame:Biblioteca Digital de Teses e Dissertações da UFRRJ, instname:Universidade Federal Rural do Rio de Janeiro, instacron:UFRRJ
Rightsinfo:eu-repo/semantics/openAccess
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