J. Chen et al., EMPIRICAL CORRELATION OF C-13 NMR CHEMICAL-SHIFT WITH ORIENTATIONAL ORDERING IN SOLID KNC60(THF)(M)(N=1-3), Solid state communications, 95(4), 1995, pp. 233-237
KnC60(THF)(m) (n=1-3, m=n) have been prepared via solution-phase route
. Variable temperature C-13 NMR data reveal that there exists a strong
correlation of C-13 NMR chemical shift with the degree of orientation
al order of C-60(n-) in these materials. The implications of this obse
rvation to the origin of down-field chemical shifts (relative to neutr
al C-60) in fullerene anions are discussed briefly.