Decaimento de íons cianato e a formação de carbamato de etila

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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Bibliographic Details
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
Description
Summary: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.
ISSN:1678-7064

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