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Topochemical Polymerization of C70 Controlled by Monomer Crystal Packing

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Science  27 Jul 2001:
Vol. 293, Issue 5530, pp. 680-683
DOI: 10.1126/science.1061434

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Abstract

Polymeric forms of C60 are now well known, but numerous attempts to obtain C70 in a polymeric state have yielded only dimers. Polymeric C70 has now been synthesized by treatment of hexagonally packed C70 single crystals under moderate hydrostatic pressure (2 gigapascals) at elevated temperature (300°C), which confirms predictions from our modeling of polymeric structures of C70. Single-crystal x-ray diffraction shows that the molecules are bridged into polymeric zigzag chains that extend along the c axis of the parent structure. Solid-state nuclear magnetic resonance and Raman data provide evidence for covalent chemical bonding between the C70 cages.

  • * Present address: Department of Physics, Lyman Laboratory, Harvard University, Cambridge, MA 02138, USA.

  • To whom correspondence should be addressed. E-mail: soldatov{at}physics.harvard.edu

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