Abstract
ABSTRACTThe 13C NMR lines of the stage I cesium graphite compound are broad (ca. 600 Hz) at all orientations, reflecting immobile Cs intercalation; in terms of an axial pattern the principal values are δ11 = 95 ± 5 and δ┴6 = 130 ± 6 ppm. For third and fourth stage compounds the bounding layers give a relatively sharp (60–100 Hz) pair of lines at all orientations, thus demonstrating axially symmetric shift tensors: δ11 = 66 and 56 ppm; δ┴ = 159 and 149 ppm, respectively. These well defined axial tensors reflect atomic motions in the incommensurate Cs layer; the pair of lines may arise from the two classes of carbons - those above carbons in a subsequent layer and those above hexagon centers. Lines of inner layers are sharpest for special orientations →c II →B0 and →c ┴ →B0.
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