Lupane type triterpenes as structuring elements in the monolayers and films of lecithin and fullerene derivatives

摘要

Using compression and wetting isotherm analysis, it was shown that lupane triterpenes (betuli-nol, betulinol diacetate, betulinic acid) change crucially the state of monolayers and films of C_(60) fullerene, nitroxide malonate C_(60) methanofullerene, and lecithin and also the films of their mixtures at the water-air interface. The structuring action of triterpenes in the presence of lecithin and C_(60) fullerene at high triterpene contents in the film gives rise to uniaxially oriented films similar to thin films of triterpenes (atomic force microscopy data). The formation of mixed bis-nitroxide malonate methanofullerene-triterpene films with excess of the latter affords structures shaped like crater-like bowls.