Selective Extraction of C70 by a Tetragonal Prismatic Porphyrin Cage

Yi Shi, Kang Cai, Hai Xiao, Zhichang Liu, Jiawang Zhou, Dengke Shen, Yunyan Qiu, Qing Hui Guo, Charlotte Stern, Michael R. Wasielewski, François Diederich, William A. Goddard, J. Fraser Stoddart*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

83 Scopus citations


Along with the advent of supramolecular chemistry, research on fullerene receptors based on noncovalent bonding interactions has attracted a lot of attention. Here, we present the design and synthesis of a cationic molecular cage: a cyclophane composed of two tetraphenylporphyrins, bridged face-to-face by four viologen units in a rhomboid prismatic manner. The large cavity inside the cage, as well as the favorable donor-acceptor interactions between the porphyrin panels and the fullerene guests, enables the cage to be an excellent fullerene receptor. The 1:1 host-guest complexes formed between the cage and both C60 and C70 were characterized in solution by HRMS and NMR, UV-vis and fluorescence spectroscopies, and confirmed in the solid state by single-crystal X-ray diffraction analyses. The results from solution studies reveal that the cage has a much stronger binding for C70 than for C60, resulting in a selective extraction of C70 from a C60-enriched fullerene mixture (C60/C70 = 10/1), demonstrating the potential of the cage as an attractive receptor for fullerene separation.

Original languageEnglish (US)
Pages (from-to)13835-13842
Number of pages8
JournalJournal of the American Chemical Society
Issue number42
StatePublished - Oct 24 2018

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry
  • Catalysis
  • Colloid and Surface Chemistry


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