Bulletin of the Chemical Society of Japan · 1989 · 16 citations · 8 references
Natural SciencesChemical EngineeringChemistryInterface SciencePhysical ChemistrySurface ScienceAdsorption At InterfacesChemical BondingCoordination ChemistryInterfacial PhenomenaIntermolecular ForcesSurface AdsorptionAdsorption ChemistryAnion AdsorptionAqueous Salt SolutionsInterfacial Adsorption IsothermsInterfacial Tension BehaviorInterfacial Tension MeasurementIon AdsorptionIon Solvation At Interfaces
Abstract The interfacial adsorptivity of an iron(II)–4,7-diphenyl-1,10-phenanthroline (DPP) complex in chloroform/aqueous salt solution systems was investigated by means of a high-speed stirring method and interfacial tension measurements. The interfacial spectra observed in the stirred system suggested that the adsorbed species at the interface is the tris-DPP complex. A minor effect of the anion concentration on the adsorptivity suggested that the tris-complex adsorbed as an ion-pair in a 0.1 M anion concentration. The interfacial adsorption of the ion-pair under stirring was analyzed by the Langmuir isotherm. The adsorptivity increased, depending on the counter ions, in the order ClO4−<CCl3COO−\simeqBr−<Cl−<SO42−, i.e. the order of increasing hydration energies of these anions.
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