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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Te4Se2O6 macrocycle stabilizing triangular planar and tetrahedral anions.

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Dalton Transactions (Cambridge, England : 2003)
|February 6, 2015
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Summary

New 12-membered macrocycles were synthesized via anion exchange reactions. These novel organotellurium compounds, featuring nitrate, perchlorate, and tetrafluoroborate anions, maintain structural integrity in solution and exhibit unique spectroscopic properties.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Supramolecular Chemistry

Background:

  • Macrocyclic compounds containing tellurium and selenium offer unique structural and electronic properties.
  • Anion exchange reactions are a versatile method for modifying the properties of macrocyclic complexes.
  • Understanding the behavior of these macrocycles in solution is crucial for their potential applications.

Purpose of the Study:

  • To synthesize and characterize novel 12-membered macrocycles through anion exchange reactions.
  • To investigate the structural integrity and solution-phase behavior of the synthesized macrocycles.
  • To explore the spectroscopic properties, particularly (125)Te NMR, of the new compounds.

Main Methods:

  • Anion exchange reactions using silver salts (AgNO3, AgClO4, AgBF4) with a precursor Cl-macrocycle.
  • Single crystal X-ray diffraction for structural elucidation of the resulting solids.
  • Electrospray Ionization Mass Spectrometry (ESI-MS) to assess solution integrity.
  • (125)Te Nuclear Magnetic Resonance (NMR) spectroscopy to study electronic coupling.

Main Results:

  • Successful synthesis of three new 12-membered macrocycles with nitrate, perchlorate, and tetrafluoroborate anions.
  • X-ray diffraction confirmed the formation of the desired macrocyclic structures.
  • ESI-MS demonstrated that the macrocycles remain intact in solution.
  • Solution (125)Te NMR of the tetrafluoroborate macrocycle revealed coupling to fluorine atoms, indicating Te-F interaction.

Conclusions:

  • The anion exchange reactions provide an effective route to novel organotellurium macrocycles.
  • The synthesized macrocycles exhibit good stability in solution.
  • The observed (125)Te NMR coupling provides evidence for specific anion-macrocycle interactions.