HIGH-RESOLUTION C-13 NMR-STUDIES OF HIGH-PRESSURE-POLYMERIZED C-60 - EVIDENCE FOR THE [2-DIMENSIONAL C-60 POLYMER(2] CYCLOADDITION STRUCTURE IN THE RHOMBOHEDRAL 2)

We report on C-13 NMR measurements of a rhombohedral two-dimensional p olymer of C-60 obtained under high pressure. By spinning the sample up to 12 kHz, we were able to identify six resonances at 149.1, 147.9, 1 45.2, 139.6, 134.8, and 73.5 ppm. The static distortion of the C-60 mo lecules induced by the transformation under pressure must be at the or igin of the observed inequivalent carbons in the polymer. The C-13 NMR line shape simulation of the obtained spectrum is compatible with the suggested polymeric structures where the C-60 molecules are connected by [2 + 2] cycloadditions.