Adsorption behaviour and orientation of adenosine molecules at the mercury drop electrode: Congruence of isotherms with respect to the electrode potential and surface charge density in neutral electrolytes

Abstract

The parameters of the electrocapillary maximum of mercury in the presence of adenosine, together with the results of measurements of the differential capacitance of mercury in the same solutions, were used in calculating the total surface charge density q and the interfacial tension σ. In 1 N solutions of Na 2SO 4, NaClO 4, KNO 3, KCl and KBr the isotherms exhibited simultaneous congruence with respect to the electrode potential and surface charge density, within certain limits, for all electrolytes. The coefficient a of the adsorption isotherm was shown to have a high value, confirming that two-dimensional condensation of the adenosine molecules took place at high concentrations.