Abstract
13C spin-lattice relaxation time measurements of buckminsterfullerene were performed in mixtures of protonated and deuterated toluene to determine the magnitude of the intermolecular contribution. Results show that a small but measurable contribution can be attributed to this mechanism. Inclusion of this effect in the analysis of the overall spin-lattice relaxation rate provided a slight improvement in the agreement between the measured reorientational time and a value predicted by a modified Stokes-Einstein-Debye equation for molecular rotation. Relaxation measurements conducted in the presence of molecular oxygen showed a significant paramagnetic effect. This observation indicates that complete removal of molecular oxygen is extremely important when measuring the 13C relaxation time of buckminsterfullerene in condensed phases.
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