Adsorption of tetraphenylphosphonium chloride at the mercury-water interface

Interfacial tersion measurements of mercury in contact with aqueous solutions of tetraphenylphosphonium chloride indicate the existence, at negative rational potentials, of an ordered monolayer of tetraphenylphosphonium ions, either as such or as its neutral salt. The analysis clearly illustrates the limits to the molecular information obtainable from electrical measurements.