THE ION TRANSFER FROM AQUEOUS(W), FORMAMIDE(FA) OR W-FA MIXTURES TO ORGANIC SOLUTION STUDIED BY POLAROGRAPHY AT THE ELECTROLYTE SOLUTION DROPPING ELECTRODE

Formamide or aqueous-formamide mixture is introduced for the ion transfer voltammetry at a liquid/liquid interface as one phase in place of the aqueous phase. The transfer of I-, BF4-4, C104- and CH3(CH2)n(CH3)3N+(n≥1) was investigated at the interface of aqueous, formamide or the aqueousformamide mixtures and 2-nitro-m-xylene. The transfer of these ions was confirmed to be polarographically reversible. The relations are discussed between the standard Gibbs transfer free energy, ΔG°tr, of these ions and the nature of the transferring ions or the properties of solvents based on the half-wave potentials in the polarograms. The ΔG°0tr of small anions from formamide to nitroxylene are smaller than those from aqueous. The effect of the addition of CH2 in CH3(CH2)n(CH3)3N+ on ΔG°tr from formamide to nitroxylene is smaller than that from aqueous.