W. Kolodziejski et J. Klinowski, C-13-]H-1 AND H-1-]C-13 CROSS-POLARIZATION NMR IN TOLUENE-SOLVATED FULLERENE-70, Chemical physics letters, 247(4-6), 1995, pp. 507-509
NMR cross-polarization in toluene-solvated fullerene-70 at natural C-1
3 isotopic abundance can proceed in both directions (C-13 --> H-1 and
H-1 --> C-13) and is not site-specific, which means that each carbon s
ite experiences the same average dipolar field from remote protons dur
ing the cross-polarization contact.