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Photoelectron imaging reveals electronic structures of alkenoxide radical anions. These findings offer insights into the electronic properties and conformational preferences of these important chemical species.

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Area of Science:

  • Physical Chemistry
  • Quantum Chemistry
  • Spectroscopy

Background:

  • Alkenoxide radical anions are key intermediates in chemical reactions.
  • Understanding their electronic structure is crucial for predicting reactivity.
  • Previous studies have focused on saturated alkoxy radicals, leaving unsaturated systems less explored.

Purpose of the Study:

  • To investigate the electronic properties of three alkenoxide radical anions: 3-buten-1-oxide, 3-buten-2-oxide, and 2-propenoxide.
  • To determine their electron binding energies and analyze photoelectron angular distributions.
  • To elucidate the influence of molecular structure on electronic state energies.

Main Methods:

  • Photoelectron imaging spectroscopy was employed to obtain high-resolution spectra.
  • Density functional theory (DFT) calculations provided supporting theoretical data.
  • Analysis of detachment features and angular distributions was performed.

Main Results:

  • Intense detachment features were observed around 2 eV electron binding energy for all studied anions.
  • Photoelectron angular distributions indicated overlapping transitions corresponding to X̃ and à electronic states.
  • The energy splitting between the ground and first excited states varied among the conformers, with 2-propenoxy radical exhibiting the largest splitting (0.17 eV).

Conclusions:

  • The electronic structure of alkenoxide radical anions is influenced by the interplay between non-bonding oxygen orbitals and the π bond.
  • Stronger orbital interactions in 3-buten-2-oxy radical lead to a greater energy difference between electronic states compared to 3-buten-1-oxy radical.
  • The study provides valuable data for understanding the electronic behavior of unsaturated oxygen-containing radicals.