1 3C NMR determination of the in-plane carbon–carbon bond length in graphite intercalation compounds

The 13C NMR spectrum of AsF5 intercalated graphite is shown to be particularly simple when the applied magnetic field is perpendicular to the graphite sheets. Doublets centered on the main resonance are observed. These result from the dipolar interaction with 13C atoms in nearest neighbor positions, next nearest neighbor positions, etc. In this special orientation, the splittings depend only on r−3ij, where rij is the carbon–carbon distance between two atoms in the same sheet. Accurately determined splittings in the 13C NMR spectra of carefully oriented samples of graphite intercalation compounds can, therefore, be utilized to measure in-plane carbon–carbon distances.