Margadonna S, Pontiroli D, Belli M, Shiroka T, Ricco M, Brunelli M. Li4C60: A Polymeric Fulleride with a Two-Dimensional Architecture and Mixed Interfullerene Bonding Motifs.
J Am Chem Soc 2004;
126:15032-3. [PMID:
15547992 DOI:
10.1021/ja044838o]
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Abstract
All known fullerene polymers have interfullerene connections via either [2 + 2] cycloaddition or single C-C bonds. The high-resolution synchrotron X-ray powder diffraction technique was employed here to determine the crystal structure of the Li4C60 fulleride. We find that the ground state of Li4C60 is a two-dimensional polymer with monoclinic crystal symmetry and an unprecedented architecture, combining both the [2 + 2] cycloaddition and the single C-C bridging motifs. The small size of the Li+ cations is crucial in stabilizing the resulting tightly packed polymeric structure.
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