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Solid C60 was stored in NO under high pressure, and the gas molecules NO were found to diffuse into the octahedral interstitial sites in its fcc crystal lattice. Its 13C NMR MAS spectra are composed of a primary resonance at 143.7 ppm accompanied by two minor peaks shifted 0.4 and 0.8 ppm downfield, respectively. The dopant was found to depress its phase transition temperature at 260 K in pure C60 and to substantially reduce the drop Δɛ′ at the phase transition temperature. Furthermore, the spectral features associated with relaxation during glass transition at lower temperature, as observed in impedance spectra, were smeared. The fraction of P-orientation below T c was calculated to be larger than 11/12. These results show that a completely P-oriented phase occurred in (NO)0.1C60 and that this phase is favored by a negative pressure on the C60 lattice exerted by NO, as well as by the electrostatic interaction between the two.

Complete pentagon orientational ordering in C60 fullerite charged with NO