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• W2074080011 abstract "The rotational dynamics of C(60) in the solid state have been investigated with carbon-13 nuclear magnetic resonance ((13)C NMR). The relaxation rate due to chemical shift anisotropy (1/9T1(CSA)(1)) was precisely measured from the magnetic field dependence of T(1), allowing the molecular reorientational correlation time, tau, to be determined. At 283 kelvin, tau = 9.1 picoseconds; with the assumption of diffusional reorientation this implies a rotational diffusion constant D = 1.8 x 10(10) per second. This reorientation time is only three times as long as the calculated tau for free rotation and is shorter than the value measured for C(60) in solution (15.5 picoseconds). Below 260 kelvin a second phase with a much longer reorientation time was observed, consistent with recent reports of an orientational phase transition in solid C(60). In both phases tau showed Arrhenius behavior, with apparent activation energies of 1.4 and 4.2 kilocalories per mole for the high-temperature (rotator) and low-temperature (ratchet) phases, respectively. The results parallel those found for adamantane." @default.
• W2074080011 created "2016-06-24" @default.
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• W2074080011 date "1992-03-06" @default.
• W2074080011 modified "2023-10-18" @default.
• W2074080011 title "C ₆₀ Rotation in the Solid State: Dynamics of a Faceted Spherical Top" @default.
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• W2074080011 doi "https://doi.org/10.1126/science.255.5049.1235" @default.
• W2074080011 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17816831" @default.
• W2074080011 hasPublicationYear "1992" @default.
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