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Related Experiment Videos

Tricyclopropylamine and Its Radical Cation.

de Meijere A1, Chaplinski, Winsel

  • 1Institut für Organische Chemie der Universität, Tammannstrasse 2, D-37077 Göttingen (Germany).

Angewandte Chemie (International Ed. in English)
|August 24, 1999
PubMed
Summary

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Tricyclopropylamine exhibits a high ionization energy and oxidation potential due to its unique molecular geometry. Gamma irradiation reveals a significant structural transformation to a planar radical cation, as confirmed by EPR spectroscopy and computations.

Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Spectroscopy

Background:

  • Tricyclopropylamine (1) displays distinct electronic properties compared to triisopropylamine.
  • The molecular geometry of tricyclopropylamine, particularly the orientation of cyclopropyl groups around the nitrogen atom, is proposed to influence its properties.

Purpose of the Study:

  • To investigate the unusual electronic properties of tricyclopropylamine.
  • To elucidate the structural and conformational changes upon ionization.
  • To correlate molecular structure with observed electronic and spectroscopic data.

Main Methods:

  • Experimental determination of ionization energy and oxidation potential.
  • Gamma irradiation of tricyclopropylamine to generate radical cations.

Related Experiment Videos

  • Electron Paramagnetic Resonance (EPR) spectroscopy for radical cation characterization.
  • Computational chemistry methods for structural and electronic analysis.

    • Main Results:

    • Tricyclopropylamine shows a high first vertical ionization energy (8.44 eV) and oxidation potential.
    • Gamma irradiation produces the tricyclopropylamine radical cation (1(.)(+)).
    • EPR spectroscopy and computations reveal a planar, C(3h)-symmetrical structure for the radical cation.
    • A dramatic conformational change occurs from the neutral molecule to the radical cation.

    Conclusions:

    • The unique geometry of tricyclopropylamine, with near-tetrahedral nitrogen and perpendicular cyclopropyl groups, explains its high ionization energy and oxidation potential.
    • Ionization induces a significant structural rearrangement to a planar radical cation.
    • The study highlights a previously unreported conformational change driven by electronic structure modifications.