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Enolate structure and electron affinity.

David A Walthall1, Joel M Karty, Bettina Römer

  • 1Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.

The Journal of Physical Chemistry. A
|July 13, 2006
PubMed
Summary
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This study measured electron affinities for cyclic enolates using ion cyclotron resonance spectroscopy. Alkylation effects on electron affinities and vibrational mode impacts on dipole-bound states were analyzed.

Area of Science:

  • Physical Chemistry
  • Organic Chemistry
  • Spectroscopy

Background:

  • Cyclic enolates are important intermediates in organic synthesis.
  • Understanding their electronic properties, such as electron affinities, is crucial for predicting reactivity.
  • Previous studies have explored electron affinities of various organic anions, but systematic investigations on cyclic enolates are less common.

Purpose of the Study:

  • To measure photodetachment cross sections and determine electron affinities for a series of methylated cyclic enolates.
  • To analyze the influence of alkylation on electron affinities.
  • To investigate the effect of vibrational modes on the lifetimes of dipole-bound states in specific enolates.

Main Methods:

  • Utilized a continuous wave (CW) ion cyclotron resonance instrument for ion generation and detection.

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  • Employed photodetachment techniques to probe the electronic structure of anions.
  • Analyzed spectral data to calculate electron affinities and assess vibrational effects.

    • Main Results:

    • Reported electron affinities for ten different cyclic enolates, including methyl-substituted cyclopentenolates and cyclohexenolates.
    • Observed and discussed the impact of alkyl group substitution on electron affinity values.
    • Examined the role of vibrational modes in the stability and lifetimes of dipole-bound states for specific enolate anions.

    Conclusions:

    • The study provides valuable electron affinity data for a range of cyclic enolates.
    • Alkylation demonstrably influences the electron affinity of these systems.
    • Vibrational dynamics play a role in the properties of dipole-bound states, impacting anion stability.