Nano‐Saturn: Experimental Evidence of Complex Formation of an Anthracene Cyclic Ring with C<sub>60</sub>

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  • Yuta Yamamoto
    Department of Chemistry and Materials Science Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8551 Japan
  • Eiji Tsurumaki
    Department of Chemistry and Materials Science Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8551 Japan
  • Kan Wakamatsu
    Department of Chemistry Faculty of Science Okayama University of Science 1-1 Ridaicho, Kita-ku Okayama 700-0005 Japan
  • Shinji Toyota
    Department of Chemistry and Materials Science Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8551 Japan

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<jats:title>Abstract</jats:title><jats:p>An anthracene cyclic hexamer was synthesized by the coupling reaction as a macrocyclic hydrocarbon host. This disk‐shaped host included a C<jats:sub>60</jats:sub> guest in 1:1 ratio to form a Saturn‐type supramolecular complex in solution and in crystals. X‐ray analysis unambiguously revealed that the guest molecule was accommodated in the middle of the host cavity with several CH⋅⋅⋅π contacts. The association constant K<jats:sub>a</jats:sub> determined by NMR titration measurements was 2.3×10<jats:sup>3</jats:sup> L mol<jats:sup>−1</jats:sup> at 298 K in toluene. The structural features and the role of CH⋅⋅⋅π interactions are discussed with the aid of DFT calculations.</jats:p>

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