Topochemical Polymerization of C 70 Controlled by Monomer Crystal Packing
- 27 July 2001
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 293 (5530) , 680-683
- https://doi.org/10.1126/science.1061434
Abstract
Polymeric forms of C 60 are now well known, but numerous attempts to obtain C 70 in a polymeric state have yielded only dimers. Polymeric C 70 has now been synthesized by treatment of hexagonally packed C 70 single crystals under moderate hydrostatic pressure (2 gigapascals) at elevated temperature (300°C), which confirms predictions from our modeling of polymeric structures of C 70 . 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 C 70 cages.Keywords
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