Raman scattering from vibrational and electronic states arising from molecular orbitals of the ferricenium ion

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  • B. F. Gächter
    Department of Chemistry, Carleton University, Ottawa, Canada
  • J. A. Koningstein
    Department of Chemistry, Carleton University, Ottawa, Canada
  • V. T. Aleksanjan
    Institute of Organoelement Compounds, Academy of Sciences of the U.S.S.R., 28 Vavilova Street, Moscow B-312, U.S.S.R.

Abstract

<jats:p>The laser excited Raman spectra of some ferricenium complexes are reported. Small differences exist in the frequency of vibrational modes which involve the iron atom of the ferrocene and ferricenium molecules but the bands of the latter are resonance enhanced. The ferricenium ion has low lying electronic states and the electronic Raman process is allowed. We report here on the observation and interpretation of the E(1/2)g (2A1g) ← E(3/2)g (2E2g) transitions which occur in the 200 cm−1 region. At present we have not found evidence of the occurrence of a Jahn–Teller effect. The results of the electronic Raman measurements are in good agreement with EPR data.</jats:p>

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