C-13 Nmr Study On One Dimensional Fullerene Polymer

We have prepared three C-60 polymers under high-temperature and high-pressure conditions, and confirmed them to be orthorhombic (1D), tetragonal and rhombohedral (2D) polymer by XRD method, respectively. The C-13 MAS NMR spectra of both orthorhombic and rhombohedral. polymer have been measured and two resonance peaks observed. One resonance at 73 ppm resulted from the sp(3) carbons with an intermolecular bonding, the other at 145 ppm is from the inequivalent sp(2) carbons on the C-60 molecule. For 1D polymer, the fine structure of the main peak at 145 ppm has been analyzed. By simulation of the C-13 MAS NMR peak shape of the inequivalent carbons, we propose that there exist nine inequivalent carbons on a C-60 molecule in the orthorhombic (1D) polymer.