Abstract
Abstract The adsorption of 2,2′-bipyridine and its ferrous complex [Fe(bip)3]2+ onto the electrode has been studied both by the electrocapillary method and the impedancebridge method. Electrocapillary curves were obtained by the drop-time method. A peculiar shape was observed in the electrocapillary curve of [Fe(bip)3]2+, which was corrected for in the further thermodynamic treatment by taking into account the data obtained with an impedance bridge. It was found that 2,2′-bipyridine is adsorbed flat in the more positive region. At more negative potentials, the adsorption is also flat at low concentrations of 2,2′-bipyridine, but becomes perpendicular beyond 2×10−3 m. The [Fe-(bip)3]2+ adsorption can be accounted for by a Langmuir isotherm. However, the isotherm for 2,2′-bipyridine adsorption varies with the potential, which can be explained in terms of the change in the adsorption structure.
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