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Related Concept Videos

Organic Compounds03:02

Organic Compounds

All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
Halogens03:01

Halogens

Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group.
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Constitutional Isomers of Alkanes

Organic compounds of the same molecular formula can have different structural formulas called constitutional isomers, and the phenomenon is known as constitutional isomerism. Alkanes with four or more carbons showing multiple structures with the same molecular formula thereby exhibit constitutional isomerism.
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The second triannulenylene: tri-[8]annulenylene.

Matthew K Kiesewetter1, Richard C Reiter, Cheryl D Stevenson

  • 1Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA.

Journal of the American Chemical Society
|July 22, 2004
PubMed
Summary

Researchers synthesized the tri-[8]annulenylene anion radical, revealing its unique electronic structure and planar ring system. This discovery advances the understanding of polycyclic aromatic hydrocarbons and their potential for polymerization.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Triannulenylenes are a class of polycyclic aromatic hydrocarbons with unique electronic and structural properties.
  • The synthesis and characterization of novel triannulenylene derivatives are crucial for exploring their potential applications.

Purpose of the Study:

  • To synthesize and characterize the anion radical of tri-[8]annulenylene.
  • To investigate the electronic structure and geometry of the tri-[8]annulenylene system.
  • To explore the potential for polymerization and isolation of the neutral tri-[8]annulenylene.

Main Methods:

  • Room-temperature dehydrohalogenation of bromocyclooctatetraene using potassium tert-butoxide.
  • Alkali metal reduction to generate the anion radical.
  • Electron Paramagnetic Resonance (EPR) spectroscopy for electronic structure analysis.
  • B3LYP/6-31G* calculations for spin density prediction.
  • Iodine oxidation for isolation of the neutral species.
  • Nuclear Magnetic Resonance (NMR) and mass spectrometry for structural analysis.

Main Results:

  • The anion radical of tri-[8]annulenylene was successfully generated and characterized.
  • EPR analysis indicated the odd electron is localized in one planar eight-membered ring.
  • Computational studies showed excellent agreement with experimental spin density data.
  • The neutral tri-[8]annulenylene was isolated and analyzed by NMR and mass spectrometry.
  • NMR data revealed a non-planar geometry with two rings bent above and one below the benzene plane.

Conclusions:

  • The study successfully synthesized and characterized the tri-[8]annulenylene anion radical, providing insights into its electronic and structural properties.
  • The findings highlight the unique electronic delocalization and geometric preferences of this novel polycyclic aromatic system.
  • The research contributes to the understanding of triannulenylene chemistry and their potential for further development in materials science.