Vaporization in the C60F2nOm (n=21-23; m=0.1) system

A mass-spectral study of systems of fluorinated fullerenes C60F2nOm (n = 21 -23; m = 0, 1) is reported. The enthalpies of sublimation are determined fo r the compounds C60F42, C60F44, C60F44O, and C60F46. The existence of an eq uilibrium in the gas phase between C-60 fluorides with close C : F ratios i s proven. The existence of solid solutions between the specified compounds, whose behavior in the solution is well described by Raoult's law, is presu med. The nature of the low-molecular-weight fluorocarbon ions that are char acteristic of the mass spectra of higher fluorofullerenes is studied. An in ference is made that the ionization cross section of a C-60 molecule decrea ses when fluorine atoms are attached to it.