Abstract
We characterize the orientational dynamics of C 60 -3 anions in K 3 C 60 , using two-dimensional NMR exchange spectroscopy. We find an activated temperature dependence for the reorientation rate between 195 and 220 K, with E a =460±60 meV. Molecular reorientation proceeds via small (<44 o ) rotational jumps, implying that K 3 C 60 is more highly orientationally disordered than previously proposed
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