Selective formation of C_(60)F_(18)(g) and C_(60)F_(26)(g) by reaction of [60]fullerene with molecular fluorine

摘要

Fluorination of C_(60)(s)-MnF_2(s),C_(60)(s)-NiF_2(s) and C_(60)(s)-NnF_3(s)mixtures has been studied by Keudsen cell mass spectrometry with admission of molecular fluorine.The fluorination is selective when fullerene reactswith the fluorine chemisorbed on the MnF_2 surface.When the MnF_2 content in the initaial mixtures is at least 90 mol percent both C_(60)F_(18) and C_(60)F_(36) are selectively formed.Under certain conditions,mixtures predominantly containing one of three compounds C_(60)F_(38),C_(60)F_(40)and C_(60)F_(42) can be obtained.A consecutive change of the main fluorination products(C_(60)F_(18) and C_(60)F_(36))tkes place at constant temperature (720K) and on fluorine admission.A quantitative explanation of this fact is given.Selective fluorination of C_(60)(s) by molecular fluorine is compared with solid-phase fluorination using MnF_3(s) as a fluorinating agent.