Towards the Stepwise Assembly of Molecular Borromean Rings. A Donor-Acceptor Ring-in-Ring Complex


  • Ross S. Forgan Northwestern University
  • Jason M. Spruell Northwestern University
  • John-Carl Olsen Northwestern University
  • Charlotte L. Stern Northwestern University
  • J. Fraser Stoddart Northwestern University



Borromean Rings, Ring-in-Ring Complex, DonorAcceptor, Supramolecular Chemistry, Crystal Structure


The assembly of molecular Borromean Rings from constitutionally independent rings in a stepwise manner depends on the preparation of robust “ring-in-ring” complexes. The π-electron rich macrocycle bis-1,5-dinaphtho[50]crown-14 (1) is shown to form a donor-acceptor ring-in-ring complex with the π-electron poor cyclophane cyclobis(paraquat-4,4'-biphenylene) (24+) in solution. In the crystal superstructure of [1⊂2]·4PF6, CH···O interactions between the polyether loops of 1 and the bipyridinium units of 24+ could disfavor the threading of dialkylammonium components of a third ring.




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Author Biographies

Ross S. Forgan, Northwestern University

Department of Chemistry

Jason M. Spruell, Northwestern University

Department of Chemistry

John-Carl Olsen, Northwestern University

Department of Chemistry

Charlotte L. Stern , Northwestern University

Department of Chemistry

J. Fraser Stoddart, Northwestern University

Department of Chemistry


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