Synthesis and Characterization of Two-Dimensional Rh-C60 Polymer

A rhombohedral two-dimensional (2D-Rh) C60 polymer has been successfully synthesized by cubic press methods under the conditions of 6 GPa and 700 ℃. X-ray diffraction (XRD) and nuclear magenatic resonance (NMR) were performed to characterize the samples. XRD spectrum indicates that the C60 polymer is rhombohedral, and sp3 bonds have formed between adjacent fullerene molecules via ［2+2］ cycloaddition reaction. 13C MAS NMR spectrum shows a broadened peak at 145, which has two sidebands, and one small peak at about 72. The broadening of the peak at 145 could be related to the presence of inequivalent sp2 sites and structure disorder. The sidebands of the peak at 145 show the large structure anisotropy of the corresponding carbons. The peak at 72 indicates the presence sp3 bond of adjacent C60 molecules.