Sodium-specific condensed film of α-cyclodextrin at the mercury | water interface

  • Hromadova M
  • De Levie R
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Abstract

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.

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