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Neighboring Component Effect in a Tri-stable [2]Rotaxane.

Yuping Wang1, Tao Cheng2, Junling Sun1

  • 1Department of Chemistry , Northwestern University , 2145 Sheridan Road , Evanston , Illinois 60208 , United States.

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This study investigates the fully reduced neutral state of cyclobis(paraquat-p-phenylene)cyclophane (CBPQT(0)) within a [2]rotaxane. Researchers discovered new π-donating recognition interactions involving the CBPQT(0) unit and tetrafluorophenylene acceptors.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Cyclobis(paraquat-p-phenylene)cyclophane (CBPQT) exhibits redox-dependent recognition properties in its oxidized (CBPQT4+) and partially reduced (CBPQT2(•+)) states.
  • The recognition behavior of the fully reduced neutral state (CBPQT(0)) in mechanically interlocked molecules (MIMs) like rotaxanes remained unexplored.
  • Understanding CBPQT(0)'s role is crucial for designing novel MIMs with tunable binding affinities.

Purpose of the Study:

  • To synthesize and investigate a tri-stable [2]rotaxane incorporating the CBPQT ring.
  • To explore the molecular recognition properties of the CBPQT ring across its different redox states within the rotaxane.
  • To elucidate the binding interactions of the CBPQT(0) state with acceptor units in the rotaxane's dumbbell component.

Main Methods:

  • Synthesis of a [2]rotaxane featuring a CBPQT ring and a dumbbell with bipyridinium, tetrafluorophenylene, and triazole recognition sites.
  • Solution-state investigations to analyze selective recognition events between the CBPQT ring and dumbbell components.
  • Characterization of non-covalent bonding interactions, particularly focusing on the CBPQT(0) state.

Main Results:

  • Successful synthesis of a tri-stable [2]rotaxane demonstrating selective recognition between CBPQT4+/triazole and CBPQT2(•+)/bipyridinium radical cation.
  • Confirmation of novel π-donating interactions between the neutral CBPQT(0) ring and tetrafluorophenylene acceptor units.
  • The CBPQT(0) state acts as a π-donor, expanding its recognition capabilities beyond previously known donor-acceptor and radical-pairing interactions.

Conclusions:

  • The study successfully demonstrates the role of the fully reduced CBPQT(0) state as a π-donating recognition unit in a [2]rotaxane.
  • This finding expands the understanding of redox-tunable molecular recognition in mechanically interlocked molecules.
  • The observed transannular interactions in the rotaxane are analogous to neighboring group participation in simpler organic molecules.