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Kinetics and mechanism of the reaction between 4‐hexadecylbenzenediazonium ions and vitamin C in emulsions: further evidence of the formation of diazo ether intermediates in the course of the reaction by María José Pastoriza‐Gallego; Alejandra Fernández‐Alonso; Sonia Losada‐Barreiro; Verónica Sánchez‐Paz; Carlos Bravo‐Díaz is a Chemistry article available to read on EtoBox.

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## Abstract The kinetics and mechanism of the reaction between hydrophobic 4‐hexadecylarenediazonium ions, 16‐ArN and vitamin C, VC, in a model emulsion prepared by mixing octane, acidic (HCl) water and the non‐ionic surfactant hexaethyleneglycol monododecyl ether, C~12~E~6~, were investigated. Because emulsions are opaque, linear sweep voltammetry, LSV, was employed to monitor the reaction. Voltammograms of 16‐ArN in emulsions show two reduction peaks as in aqueous systems. The half‐life for the spontaneous decomposition of 16‐ArN in the emulsion was estimated as __t__~1/2~ = 14.5 h at __T__ = 25 °C. Upon addition of VC to the system, the first reduction peak of 16‐ArN disappears almost immediately and a new reduction peak is detected at __E__~p~ = −0.25 V. Electrochemical titration of 16‐ArN shows that the new peak corresponds to the formation of a 1:1 adduct. The __i__~P~(__E__~p~ = −0.25 V) values can be linearly correlated with [16‐ArN] and the observed rate constants, __k__~obs~, were determined by fitting the (__i__~p~, __t__) data to the integrated first order equation. The variation of __k__~obs~ with [VC] follows a saturation kinetics profile, consistent with the formatio

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Author

María José Pastoriza‐Gallego; Alejandra Fernández‐Alonso; Sonia Losada‐Barreiro; Verónica Sánchez‐Paz; Carlos Bravo‐Díaz

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0894-3230)

Published

2008

Language

EN

Field

Chemistry (Physical Sciences)