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Evidence for fully conjugated double-stranded cycles.

Malte Standera1, Rolf Häfliger, Renana Gershoni-Poranne

  • 1Laboratory of Polymer Chemistry, Department of Materials, ETH Zürich, Wolfgang-Pauli-Strasse 10, HCI 541, 8093 Zürich, Switzerland.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 15, 2011
PubMed
Summary

Researchers present evidence for the first fully conjugated, double-stranded cycles, specifically fullerene C(84) belt-region analogues. These aromatic compounds were detected in the gas phase using mass spectrometry and trapping reactions.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Fullerene Chemistry

Background:

  • Fullerenes are allotropes of carbon with unique cage-like structures.
  • Fully conjugated, double-stranded cyclic molecules represent a novel structural motif.
  • Understanding the stability and properties of complex carbon structures is crucial.

Purpose of the Study:

  • To present evidence for the existence of the first fully conjugated, double-stranded cyclic molecules.
  • To characterize these novel cyclic structures, including substituted and unsubstituted variants.
  • To investigate their stability and potential reactivity.

Main Methods:

  • Mass spectrometric analysis to detect and identify the cyclic products.
  • Trapping reactions to confirm the presence and structure of the target molecules.
  • Quantum mechanical calculations to support experimental findings and explore reaction pathways.

Main Results:

  • Circumstantial evidence supports the existence of fully conjugated, double-stranded cycles with fullerene C(84) belt-region structure.
  • Products were synthesized carrying hexyl or phenyl substituents, alongside the unsubstituted parent cycle.
  • Phenyl-substituted and unsubstituted products showed resistance to [1,5] hydrogen shift, unlike alkyl-substituted analogues.

Conclusions:

  • The fully aromatic cyclic targets are confirmed to exist in the gas phase.
  • Generation in solution under applied conditions remains uncertain, with theoretical evidence suggesting it is unlikely.
  • The study provides a significant advancement in the synthesis and characterization of complex carbon nanostructures.