Nuclear magnetic resonance study of fluorine–graphite intercalation compounds and graphite fluorides

In this paper, we review the NMR investigations of graphite fluorides and fluorine–graphite intercalation compounds. The latter compounds are now considered a unique family of graphite intercalation compounds (GICs) which exhibits a behavior that is strikingly different from all other known GICs. The study of the origin of semimetal–metal and metal-insulator transformations, localization effects and C–F bonding in fluorine–graphite intercalation compound, as well as the studies of the structure, bonding, molecular dynamics and phase transitions in intercalated graphite fluorides are presented. Critical review of 13C and 19F chemical shifts is done, and the nature of C–F bond in fluorine–graphite intercalation compounds and graphite fluorides is discussed. The NMR data are compared with the results of other spectroscopic methods, X-ray and conductivity measurements. The reviewed NMR data provide an atomic level rationale for understanding of physical properties of fluorine–graphite intercalation compounds and graphite fluorides.