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The ion transfer of the basic dye rhodamine B across the liquid‐liquid interface of two immiscible solvents
Author(s) -
Sun ZhiSheng,
Wang ErKang
Publication year - 1990
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19900080104
Subject(s) - chemistry , nitrobenzene , rhodamine b , ities , chlorobenzene , electrochemistry , analytical chemistry (journal) , cyclic voltammetry , ion , diffusion , solvent , dissociation (chemistry) , thermodynamics , chromatography , organic chemistry , electrode , physics , photocatalysis , catalysis
Abstract The ion transfer of the basic dye rhodamine B at the interface between water and nitrobenzene, water and 1, 2‐dichloroethane, as well as water and nitrobenzene ‐ chlorobenzene mixtures has been studied by cyclic voltammetry and chronopotentiometry with linear current scanning. A transfer mechanism of rhodamine B is proposed in terms of its electrochemical behavior, dissociation and distribution equilibria, and is ascribed as diffusion‐controlled reversible process of rhodamine B. The experimental data obtained for the relationship between interracial half‐wave potential Δ W o φ° and pH are in agreement with the theoretical equation based on the mechanism, and the standard interfacial potential differences Δ W o φ° and standard Gibbs energies Δ W o G ° are calculated by extrapolation. The effect of the nature of solvent on the transfer behavior and the stability of the interface have been discussed.