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- W2057288306 abstract "Thermodynamic data for the electrosorption of aromatic molecules at metal electrodes (the electrosorption valency γ, surface concentration Γ, the double layer capacity CD, and the free adsorption enthalpy ΔGad) are analysed for phenol at mercury as an example. At small Γ the phenol molecule is adsorbed in a flat position, but at Γ > Γ″max this changes to perpendicular. γ is negative and λ ≈ 0.2 for flat orientation, but negligible for the perpendicular one. CD decreases with increasing coverage for both orientations, indicating a dominating thickening of the double layer. From ΔGad values a small π-bond contribution ΔGπ ≈ 50 kJ mol−1 is estimated. The energetic analysis shows that an anodic charge transfer takes place if the electrode potential approaches the oxidation potential εox and a cathodic charge transfer in the vicinity of εred. Charge transfer data for other aromatic and heterocyclic compounds were obtained using the same thermodynamic analysis. In general, the charge transfer is positive, 0 < λ < 0.3. These data can be successfully correlated with the oxidation potential, the ionization potential and the electron density in the ring respectively." @default.
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- W2057288306 date "1986-08-01" @default.
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- W2057288306 title "The role of charge transfer in the adsorption of aromatic molecules at metal electrodes" @default.
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- W2057288306 doi "https://doi.org/10.1016/0013-4686(86)80014-7" @default.
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