Decaimento de íons cianato e a formação de carbamato de etila

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 <...

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Main Authors:	Alexandre Ataide da Silva, Thiago Hideyuki Kobe Ohe, Douglas Wagner Franco
Format:	Article
Language:	English
Published:	Sociedade Brasileira de Química 2013-01-01
Series:	Química Nova
Subjects:	cyanate ion ethyl carbamate formation aqueous
Online Access:	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000800004&lng=en&tlng=en

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spelling	doaj-7ba1154b390f4db38faaaaa744c224aa2020-11-25T01:27:40ZengSociedade Brasileira de QuímicaQuímica Nova1678-70642013-01-013681101110310.1590/S0100-40422013000800004S0100-40422013000800004Decaimento de íons cianato e a formação de carbamato de etilaAlexandre Ataide da Silva0Thiago Hideyuki Kobe Ohe1Douglas Wagner Franco2Universidade de São PauloUniversidade de São PauloUniversidade de São PauloCyanate 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] > 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000800004&lng=en&tlng=encyanate ionethyl carbamate formationaqueous
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Alexandre Ataide da Silva Thiago Hideyuki Kobe Ohe Douglas Wagner Franco
spellingShingle	Alexandre Ataide da Silva Thiago Hideyuki Kobe Ohe Douglas Wagner Franco Decaimento de íons cianato e a formação de carbamato de etila Química Nova cyanate ion ethyl carbamate formation aqueous
author_facet	Alexandre Ataide da Silva Thiago Hideyuki Kobe Ohe Douglas Wagner Franco
author_sort	Alexandre Ataide da Silva
title	Decaimento de íons cianato e a formação de carbamato de etila
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
publisher	Sociedade Brasileira de Química
series	Química Nova
issn	1678-7064
publishDate	2013-01-01
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] > 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.
topic	cyanate ion ethyl carbamate formation aqueous
url	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000800004&lng=en&tlng=en
work_keys_str_mv	AT alexandreataidedasilva decaimentodeionscianatoeaformacaodecarbamatodeetila AT thiagohideyukikobeohe decaimentodeionscianatoeaformacaodecarbamatodeetila AT douglaswagnerfranco decaimentodeionscianatoeaformacaodecarbamatodeetila
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Decaimento de íons cianato e a formação de carbamato de etila

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