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Is the FeO2(-) anion bent or linear?

Zhen Hua Li1, Yu Gong, Kangnian Fan

  • 1Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Fudan University, Shanghai 200433, People's Republic of China. lizhenhua@fudan.edu.cn

The Journal of Physical Chemistry. A
|December 5, 2008
PubMed
Summary
This summary is machine-generated.

Researchers synthesized iron dioxygen anions (FeO2-) and confirmed their linear structure using vibrational spectroscopy. Advanced computational methods supported these experimental findings for the novel iron-oxygen species.

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Area of Science:

  • Inorganic Chemistry
  • Computational Chemistry
  • Spectroscopy

Background:

  • Iron-oxygen species are crucial in various chemical and biological processes.
  • Understanding the structure and bonding of iron dioxygen anions is essential for catalysis and materials science.
  • Previous studies on FeO2- were limited due to experimental challenges.

Purpose of the Study:

  • To synthesize and characterize the iron dioxygen anion (FeO2-).
  • To determine the molecular geometry and electronic state of FeO2-.
  • To evaluate the reliability of different computational methods for studying such species.

Main Methods:

  • Co-condensation of laser-ablated iron atoms and electrons with dioxygen in excess argon at cryogenic temperatures (6 K).
  • Infrared (IR) spectroscopy to identify vibrational frequencies of the synthesized anion.
  • Isotopic substitution (using Fe(16)O(2) and Fe(18)O(2)) to aid spectral assignment.
  • State-averaged multireference configuration interaction (MRCI) calculations.

Main Results:

  • Successful production of the FeO2- anion in solid argon.
  • Observation of a photosensitive absorption band at 870.6 cm(-1), assigned to the antisymmetric OFeO stretching vibration (nu(3)).
  • Isotopic analysis confirmed a linear structure for the FeO2- anion.
  • MRCI calculations predicted a linear doublet ground state, consistent with experimental data.

Conclusions:

  • The iron dioxygen anion (FeO2-) has been synthesized and characterized.
  • Experimental and computational evidence strongly supports a linear geometry for the FeO2- ground state.
  • State-averaged MRCI is a reliable method for studying iron-oxygen anions where single-reference methods fail.