Some properties of two-dimensional condensed layers formed by some terpenoids and adamantane derivatives at the mercury-electrolyte interface

Adsorption data for two-dimensional condensed layers of some terpenoids and adamantane derivatives are discussed. Capacity-potential curves at the pit edge in the negative potential range were used to investigate the temperature dependence of the two-dimensional condensation of these substances. The experimental data were treated using the Frumkin adsorption model, the quasi-chemical approximation and the lattice gas model (the Ising model). It was found that the adsorption of the organic substances investigated can best be described by the Ising model, i.e. by taking the short-range order of the adsorbed molecules into account. It was also shown that the structure of the spherical organic molecule strongly affects the compactness and the temperature stability of the condensed layer.