F-19 NMR-STUDIES OF FLUORIDE GRAPHITE INTERCALATED COMPOUNDS PREPARED UNDER FLUORINE ATMOSPHERES

Fluorine nuclear magnetic resonance studies have been made on Group V (Sb, As) fluoride and metal (Ti, V) fluoride/antimony fluoride graphite intercalated compounds prepared under a fluorine atmosphere. All samples studied were made from highly oriented pyrolytic graphite. It is shown that in the Group V fluoride compounds, the fluoride is preferentially intercalated as [MF6]-. In metal fluoride/antimony fluoride compounds, the F-19 NMR spectra are consistent with antimony fluoride preferentially intercalated as [SbF6]- in the vanadium compound, and as [Sb(n)F5n + 1]- polyanions in the titanium compound. This latter result can be explained by the ability of titanium fluoride to form polymer chains, unlike vanadium fluoride. No metal fluoride was observed in the latter systems.