α-Cyclodextrin adsorption at the mercury | water interface exhibits several condensed phases, depending on the anions and cations present. At low charge densities the interface can be covered by a condensed film of α-cyclodextrin. In the presence of sodium ions, a condensed film containing both α-cyclodextrin and Na+can be observed at a negatively charged electrode. This highly sodium-specific film contains three α-cyclodextrin molecules for every two Na+cations, and can be characterized by the interfacial solubility product [αCD]3[Na+]2= 1.65 × 10-6M5at 25°C. This film exhibits isomer-specific inhibition of reduction processes; its formation can be stochastic.
Hromadova, M., & De Levie, R. (1999). Sodium-specific condensed film of α-cyclodextrin at the mercury | water interface. Journal of Electroanalytical Chemistry, 465(1), 51–62. https://doi.org/10.1016/S0022-0728(99)00054-6