Langmuir Films of Calix[8]arene/Fullerene Complexes

Abstract

We present the pressure area isotherms for Langmuir films made of calix[8]arene, the calix[8]arene/C60 complex, and the calix[8]arene/C70 complex, all of them measured at 306.1 K. A Brewster angle microscope was used to observe the phases shown by the π−A isotherms. In these three cases, we found a solid phase and its solid−gas coexistence but no expanded liquid phases. The Langmuir films made of calix[8]arene and the calix[8]arene/C60 complex are very similar. The experimental information is consistent with the assumption that C60 is situated inside the cavity of calix[8]arene. The Langmuir films of calix[8]arene and the calix[8]arene/C70 complex are not very similar; we present a discussion to explain the origin of this difference.