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We have attempted to detect electrically neutral substances by ion-transfer voltammetry at an interface between two immiscible electrolyte solutions (ITIES), such as an interface between water and 1,2-dichloroethane (a W/DCE interface), by irradiating the interface with ultraviolet light (200 - 300 nm). In the present work, while considering the facts that p-phenylenediamine derivatives are soluble in DCE, but insoluble in water, and that cation radicals of the derivatives are fairly stable in various media, we photoionized the derivatives in a DCE phase by ultraviolet irradiation, and after that carried out ion-transfer voltammetry at a W/DCE interface. As a result, we could successfully observe ion-transfer waves of cation radicals of the derivatives from the W to DCE phase. Namely, the cation radicals are generated in the DCE phase by ultraviolet irradiation, and subsequently distributed into the W phase. In addition to these ion-transfer waves, we also found that facilitated proton-transfer waves by the derivatives were shifted to a more negative potential region after ultraviolet irradiation, because of hydrogen chloride formed from photodecomposition of DCE by ultraviolet irradiation.

analytical sciences

Ion-Transfer Voltammetry at a Water/1,2-Dichloroethane Interface Using Photoionization by Ultraviolet Irradiation: Detection of Cation Radicals of p-Phenylenediamine Derivatives