High pressure and high temperature induced polymerization of doped C60 materials

Several metastable doped C60 polymers are synthesized under high pressure and high temperature (1.5 GPa, 573 K and 2 GPa, 700 K, respectively), using C60/ferrocene(Fc, Fe(C5H5)2), C60/Ni(OEP) and C60/AgNO3 as starting materials. Raman and IR spectroscopy are used to study the polymerization of these samples after HPHT treatment. It is found that the polymerization degree is always lower than that of pure C60 treated at the same conditions, which is attributed to the space limitation by the dopants. We also find that even at the same conditions, the three doped materials form different polymeric phases of these doped materials. This is attributed to the unique initial lattice structures and the different degrees of spatial confinement provided by the dopants.