Decaimento de íons cianato e a formação de carbamato de etila

Detalhes bibliográficos
Autor(a) principal: Silva,Alexandre Ataide da
Data de Publicação: 2013
Outros Autores: Ohe,Thiago Hideyuki Kobe, Franco,Douglas Wagner
Tipo de documento: Artigo
Idioma: por
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000800004
Resumo: Cyanate ion stability was studied in aqueous/ethanolic solutions, pH = 4.5 (CH3COOH/NaCH3COO), at different temperatures. Following the decay [(OCN)-] versus time, in the presence of excess C2H5OH, the rate constant for this reaction (k1) was calculated as (2.5 ± 0.3) x 10-4 s-1 at 25 ºC, for 0 < [C2H5OH] < 13.7 x 10-1 mol L-1. For [C2H5OH] &gt; 2.0 mol L-1 a decrease in the numerical value of k1 was observed, reaching 5.2 x 10-5 s-1 when [CH3CH2OH] = 13.7 mol L-1. Variations in the kinetic parameter values ΔH1‡, ΔS1‡ and ΔG1‡ for the cyanate ion decay reaction were observed for solutions at different ethanol concentrations.
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spelling Decaimento de íons cianato e a formação de carbamato de etilacyanate ionethyl carbamate formationaqueous/ethanol solutionCyanate ion stability was studied in aqueous/ethanolic solutions, pH = 4.5 (CH3COOH/NaCH3COO), at different temperatures. Following the decay [(OCN)-] versus time, in the presence of excess C2H5OH, the rate constant for this reaction (k1) was calculated as (2.5 ± 0.3) x 10-4 s-1 at 25 ºC, for 0 < [C2H5OH] < 13.7 x 10-1 mol L-1. For [C2H5OH] &gt; 2.0 mol L-1 a decrease in the numerical value of k1 was observed, reaching 5.2 x 10-5 s-1 when [CH3CH2OH] = 13.7 mol L-1. Variations in the kinetic parameter values ΔH1‡, ΔS1‡ and ΔG1‡ for the cyanate ion decay reaction were observed for solutions at different ethanol concentrations.Sociedade Brasileira de Química2013-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000800004Química Nova v.36 n.8 2013reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422013000800004info:eu-repo/semantics/openAccessSilva,Alexandre Ataide daOhe,Thiago Hideyuki KobeFranco,Douglas Wagnerpor2013-10-04T00:00:00Zoai:scielo:S0100-40422013000800004Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2013-10-04T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Decaimento de íons cianato e a formação de carbamato de etila
title Decaimento de íons cianato e a formação de carbamato de etila
spellingShingle Decaimento de íons cianato e a formação de carbamato de etila
Silva,Alexandre Ataide da
cyanate ion
ethyl carbamate formation
aqueous/ethanol solution
title_short Decaimento de íons cianato e a formação de carbamato de etila
title_full Decaimento de íons cianato e a formação de carbamato de etila
title_fullStr Decaimento de íons cianato e a formação de carbamato de etila
title_full_unstemmed Decaimento de íons cianato e a formação de carbamato de etila
title_sort Decaimento de íons cianato e a formação de carbamato de etila
author Silva,Alexandre Ataide da
author_facet Silva,Alexandre Ataide da
Ohe,Thiago Hideyuki Kobe
Franco,Douglas Wagner
author_role author
author2 Ohe,Thiago Hideyuki Kobe
Franco,Douglas Wagner
author2_role author
author
dc.contributor.author.fl_str_mv Silva,Alexandre Ataide da
Ohe,Thiago Hideyuki Kobe
Franco,Douglas Wagner
dc.subject.por.fl_str_mv cyanate ion
ethyl carbamate formation
aqueous/ethanol solution
topic cyanate ion
ethyl carbamate formation
aqueous/ethanol solution
description Cyanate ion stability was studied in aqueous/ethanolic solutions, pH = 4.5 (CH3COOH/NaCH3COO), at different temperatures. Following the decay [(OCN)-] versus time, in the presence of excess C2H5OH, the rate constant for this reaction (k1) was calculated as (2.5 ± 0.3) x 10-4 s-1 at 25 ºC, for 0 < [C2H5OH] < 13.7 x 10-1 mol L-1. For [C2H5OH] &gt; 2.0 mol L-1 a decrease in the numerical value of k1 was observed, reaching 5.2 x 10-5 s-1 when [CH3CH2OH] = 13.7 mol L-1. Variations in the kinetic parameter values ΔH1‡, ΔS1‡ and ΔG1‡ for the cyanate ion decay reaction were observed for solutions at different ethanol concentrations.
publishDate 2013
dc.date.none.fl_str_mv 2013-01-01
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=S0100-40422013000800004
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000800004
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv 10.1590/S0100-40422013000800004
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 Química Nova v.36 n.8 2013
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
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