EPR, C-13 and B-11 NMR of boronated carbons intercalated with heavy alkalimetals (K, Rb and Cs)

BxC1-x host materials (0.1 <x< 0.25) and their intercalation compounds with heavy alkali metals prepared from the vapor reaction or from the reaction of cesium in ammonia solution were characterized using C-13 and B-11 NMR an d EPR. C-13 NMR shifts and EPR dysonian lines (typical of conductors) found in intercalation compounds are qualitatively similar to those observed in their GIC analogues. Evidence are reported in favor of a breaking of the lo cal axial symmetry due to interstitial boron atoms for highest x values and partial recover of this symmetry in the intercalation compounds.