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Gas-phase electronic absorption spectroscopy of substituted bis(η6-benzene)chromium derivatives: Rydberg transitions in bis(η6-anisole)chromium and bis(η6-2,6-dimethylpyridine)chromium

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Abstract

Gas-phase electronic absorption spectra of chromium bisarene complexes with oxygen- and nitrogen-containing ligands, (η6-PhOMe)2Cr (1) and (η6-2,6-Me2C5H3N)2Cr (2), were first measured. Rydberg bands disappearing on going to the condensed-phase spectra were revealed. The first ionization potentials of complexes 1 and 2 (5.30 and 5.40 eV, respectively) were determined from the Rydberg frequencies. The Rydberg transitions were assigned and the corresponding Rydberg term values and quantum defects were determined. The effect of heteroatoms on the Rydberg structure parameters was revealed by comparing the spectra of complexes 1 and 2 with those of unsubstituted analogs. The appearance, in the ligand side chain, of an oxygen atom capable of being involved in conjugation with the π-electron system of the aromatic ring results in substantial broadening of the observed Rydberg bands. This can be associated with an increased ligand contribution to the HOMO of the sandwich compound. The influence of the oxygen atom on the ionization energy of the molecule is insignificant. In contrast to this, introduction of a nitrogen atom into the carbocycle leads to a noticeable increase in the ionization potential of the molecule, while the ligand contribution to the HOMO of the complex remains practically unchanged.

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Authors and Affiliations

  1. G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 ul. Tropinina, 603950, Nizhny Novgorod, Russian Federation

    S. Yu. Ketkov, G. A. Domrachev & A. M. Ob’edkov

  2. A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Vavilova, 119991, Moscow, Russian Federation

    A. Yu. Vasil’kov & L. P. Yur’eva

  3. Inorganic Chemistry Laboratory, University of Oxford, OX1 3QR, Oxford, South Parks Road, UK

    C. P. Mehnert

Authors
  1. S. Yu. Ketkov
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  2. G. A. Domrachev
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  3. A. M. Ob’edkov
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  4. A. Yu. Vasil’kov
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  5. L. P. Yur’eva
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  6. C. P. Mehnert
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1854–1859, September, 2004.

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Ketkov, S.Y., Domrachev, G.A., Ob’edkov, A.M. et al. Gas-phase electronic absorption spectroscopy of substituted bis(η6-benzene)chromium derivatives: Rydberg transitions in bis(η6-anisole)chromium and bis(η6-2,6-dimethylpyridine)chromium. Russ Chem Bull 53, 1932–1937 (2004). https://doi.org/10.1007/s11172-005-0051-8

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  • DOI: https://doi.org/10.1007/s11172-005-0051-8

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