Unusual redox state dependent fermi resonances in the infrared spectra of trinuclear ruthenium clusters with isocyanide ligands

Igor S. Zavarine, Clifford P. Kubiak, Tadashi Yamaguchi, Ken Ichiro Ota, Taeko Matsui, Tasuku Ito

研究成果: Article

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Four different redox states of the trinuclear ruthenium clusters of general formula [Ru33-O)(μ-CH3CO2)6(L)3] (L = xylyl isocyanide (1), tert-butyl isocyanide (2)) were generated electrochemically in solution and studied by reflectance infrared spectroelectrochemistry. The IR spectra in the v-(C≡N) region show multiple-band structure in the Ru(III)Ru(II)2 ( - 1) and uRu(III)2Ru(II) (0) states but a sharp single band in the Ru(III)3 (+1) or Ru(IV)Ru(III)2 (+2) state. Density functional theory (DFT) ab initio calculations were performed for free xylyl isocyanide and tert-butyl isocyanide. The results suggest that the C≡N - C bending mode interacts through Fermi resonance with the v(C≡N) fundamental for the 0 and - 1 states of both 1 and 2. The extensive redox chemistry of the Ru3-(μ3-O) clusters 1 and 2 offers a convenient means of effecting shifts in the energy of v(C≡N) bands of coordinated isocyanide ligands, in and out of Fermi resonance with the C≡N - C bending overtone.

元の言語English
ページ(範囲)2696-2698
ページ数3
ジャーナルInorganic Chemistry
39
発行部数12
DOI
出版物ステータスPublished - 2000 6 12
外部発表Yes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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