Anion and cation interactions with p-dodecanoylcalix[4]arene monolayers atthe air-water interface

The Langmuir compression isotherms of p-dodecanoylcalix[4]arene have been s tudied on subphases containing varying concentrations of group IA salts. Th e effect of anions on the stability of the monolayers shows that, for aceta te and bicarbonate, there is a large increase in collapse pressure, when so dium is the countercation. In the case of cation effects, rubidium chloride shows a large stabilization of the monolayer.