High-resolution 13C NMR investigation in Cs4C60.

Abstract

Four inequivalent carbons were identified by using high-resolution magic angle spinning $^{13}\mathrm{C}$ NMR spectroscopy in ${\mathrm{Cs}}_{4}$${\mathrm{C}}_{60}$. The room temperature NMR spectrum consists of four lines at 214 ppm, 189 ppm, 164 ppm, and 159 ppm, which collapse into a single line at 183 ppm when the sample is heated above 350 K. The intensity of the latter is the sum of the four line intensities. The observed behavior is interpreted in terms of a nonuniform charge and spin distribution on the ${\mathrm{C}}_{60}$ molecules combined with molecular dynamics. \textcopyright{} 1996 The American Physical Society.