Effect of the supporting electrolytes on voltammetry at liquid│liquid microinterfaces between water and nitrobenzene, 1,2-dichloroethane or 1,6-dichlorohexane. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of electroanalytical chemistry and interfacial electrochemistry Année : 2009

Effect of the supporting electrolytes on voltammetry at liquid│liquid microinterfaces between water and nitrobenzene, 1,2-dichloroethane or 1,6-dichlorohexane.

Résumé

The transfers of the ions of tetraalkylammonium picrates (-methyl, -ethyl, -propyl, -butyl), from water (W) to nitrobenzene (NB), 1,2-dichloroethane (DCE) or 1,6-dichlorohexane (DCH), have been studied by voltammetry at liquid/liquid microinterfaces. Electrochemistry is possible in the absence of supporting electrolytes in both phases, even in the less dissociating solvents, DCE and DCH, when the concentration of the picrate is lower than 103 M, the main difficulty however being the lack of reference electrodes. Without an electrolyte in the organic phase, the limiting current for an ionic transfer from the solvent to water is two times the diffusion current, due to the migration. This is not the case when the transferring ions are in water where an adventitious electrolyte is always present. Comparing voltammetry of the ion transfers with and without electrolytes has shown that ion-pairing in DCE and DCH influences the partition of the salts, which has been confirmed by some spectrophotometrical measurements. As a consequence, the partition potential scales derived from experiments performed in DCE and DCH in the presence of electrolytes are conditional.

Dates et versions

hal-00456927 , version 1 (16-02-2010)

Identifiants

Citer

Mickael Rimboud, Kevin Charreteur, Vladimir Sladkov, Catherine Elleouet, Francois Quentel, et al.. Effect of the supporting electrolytes on voltammetry at liquid│liquid microinterfaces between water and nitrobenzene, 1,2-dichloroethane or 1,6-dichlorohexane.. Journal of electroanalytical chemistry and interfacial electrochemistry, 2009, 636, pp.53-59. ⟨10.1016/j.jelechem.2009.09.008⟩. ⟨hal-00456927⟩
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