Synthesis and thermal behavior of new liquid crystals arylaldoxime esters
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of the Brazilian Chemical Society (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532012000500013 |
Resumo: | We report the synthesis of a series of liquid-crystalline materials based on arylaldoxime esters and the characterization of these materials by ¹H, 13C NMR, ATR/FT-IR spectroscopy and elemental analysis. The chemical stability and liquid-crystalline as well as photophysical properties of the compounds are described being dependent on the heating/cooling cycles. The changes in chemical stability and the liquid crystals properties of arylaldoxime esters were observed during these thermal cycles by IR analysis. All samples underwent a thermal degradation yielding the corresponding nitriles and carboxylic acid as evidenced by IR and ¹H NMR spectra. Due to the decomposition process, information about the mesomorphic behaviour is lost. The UV-Vis absorption spectra in solution display three absorption bands between 230 and 340 nm. The fluorescence spectra exhibit a broad and structureless emission band located at 430 nm. Ab initio calculations were performed to obtain information on the molecular structure and properties of the title compounds. |
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Journal of the Brazilian Chemical Society (Online) |
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Synthesis and thermal behavior of new liquid crystals arylaldoxime estersarylaldoxime estersliquid crystalsinfra-red analysisisoxazolinesWe report the synthesis of a series of liquid-crystalline materials based on arylaldoxime esters and the characterization of these materials by ¹H, 13C NMR, ATR/FT-IR spectroscopy and elemental analysis. The chemical stability and liquid-crystalline as well as photophysical properties of the compounds are described being dependent on the heating/cooling cycles. The changes in chemical stability and the liquid crystals properties of arylaldoxime esters were observed during these thermal cycles by IR analysis. All samples underwent a thermal degradation yielding the corresponding nitriles and carboxylic acid as evidenced by IR and ¹H NMR spectra. Due to the decomposition process, information about the mesomorphic behaviour is lost. The UV-Vis absorption spectra in solution display three absorption bands between 230 and 340 nm. The fluorescence spectra exhibit a broad and structureless emission band located at 430 nm. Ab initio calculations were performed to obtain information on the molecular structure and properties of the title compounds.Sociedade Brasileira de Química2012-05-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532012000500013Journal of the Brazilian Chemical Society v.23 n.5 2012reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532012000500013info:eu-repo/semantics/openAccessTavares,AlineArruda,Bárbara C.Boes,Elvis S.Stefani,ValterStassen,Hubert K.Campo,Leandra F.Bechtold,Ivan H.Merlo,Aloir A.eng2012-06-01T00:00:00Zoai:scielo:S0103-50532012000500013Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2012-06-01T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Synthesis and thermal behavior of new liquid crystals arylaldoxime esters |
title |
Synthesis and thermal behavior of new liquid crystals arylaldoxime esters |
spellingShingle |
Synthesis and thermal behavior of new liquid crystals arylaldoxime esters Tavares,Aline arylaldoxime esters liquid crystals infra-red analysis isoxazolines |
title_short |
Synthesis and thermal behavior of new liquid crystals arylaldoxime esters |
title_full |
Synthesis and thermal behavior of new liquid crystals arylaldoxime esters |
title_fullStr |
Synthesis and thermal behavior of new liquid crystals arylaldoxime esters |
title_full_unstemmed |
Synthesis and thermal behavior of new liquid crystals arylaldoxime esters |
title_sort |
Synthesis and thermal behavior of new liquid crystals arylaldoxime esters |
author |
Tavares,Aline |
author_facet |
Tavares,Aline Arruda,Bárbara C. Boes,Elvis S. Stefani,Valter Stassen,Hubert K. Campo,Leandra F. Bechtold,Ivan H. Merlo,Aloir A. |
author_role |
author |
author2 |
Arruda,Bárbara C. Boes,Elvis S. Stefani,Valter Stassen,Hubert K. Campo,Leandra F. Bechtold,Ivan H. Merlo,Aloir A. |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
Tavares,Aline Arruda,Bárbara C. Boes,Elvis S. Stefani,Valter Stassen,Hubert K. Campo,Leandra F. Bechtold,Ivan H. Merlo,Aloir A. |
dc.subject.por.fl_str_mv |
arylaldoxime esters liquid crystals infra-red analysis isoxazolines |
topic |
arylaldoxime esters liquid crystals infra-red analysis isoxazolines |
description |
We report the synthesis of a series of liquid-crystalline materials based on arylaldoxime esters and the characterization of these materials by ¹H, 13C NMR, ATR/FT-IR spectroscopy and elemental analysis. The chemical stability and liquid-crystalline as well as photophysical properties of the compounds are described being dependent on the heating/cooling cycles. The changes in chemical stability and the liquid crystals properties of arylaldoxime esters were observed during these thermal cycles by IR analysis. All samples underwent a thermal degradation yielding the corresponding nitriles and carboxylic acid as evidenced by IR and ¹H NMR spectra. Due to the decomposition process, information about the mesomorphic behaviour is lost. The UV-Vis absorption spectra in solution display three absorption bands between 230 and 340 nm. The fluorescence spectra exhibit a broad and structureless emission band located at 430 nm. Ab initio calculations were performed to obtain information on the molecular structure and properties of the title compounds. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-05-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532012000500013 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532012000500013 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-50532012000500013 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
dc.source.none.fl_str_mv |
Journal of the Brazilian Chemical Society v.23 n.5 2012 reponame:Journal of the Brazilian Chemical Society (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
instname_str |
Sociedade Brasileira de Química (SBQ) |
instacron_str |
SBQ |
institution |
SBQ |
reponame_str |
Journal of the Brazilian Chemical Society (Online) |
collection |
Journal of the Brazilian Chemical Society (Online) |
repository.name.fl_str_mv |
Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ) |
repository.mail.fl_str_mv |
||office@jbcs.sbq.org.br |
_version_ |
1750318173469540352 |