Y. Maniwa et al., NUCLEAR-MAGNETIC-RESONANCE (NMR) AND ELECTRON-SPIN-RESONANCE (ESR) CHARACTERIZATION OF SUBLIMED C-60 SOLID, JPN J A P 2, 33(2A), 1994, pp. 120000173-120000176
Two kinds of electron spin resonance (ESR) signals were found in subli
med carbon-sixty (C-60) solid, one of which is extremely sensitive to
air while the other is relatively stable. Although the origin of these
signals could not be clarified, it was found that successive sublimat
ion leads to a C-60 solid which does not show any detectable ES R sign
al. C-13-nuclear magnetic resonance (NM R) study showed that the subli
med solid is much more homogeneous than the solution-grown solids, and
that C-60 orientational ordering transition around 262 K is a first-o
rder phase transition.