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Related Experiment Videos

Mid-Infrared Spectrum of [Ru(phen)(3)](2+).

Kristin M. Omberg1, Jon R. Schoonover, Stefan Bernhard

  • 1Bioscience and Biotechnology Group (CST-4), Chemical Science and Technology Division, Mail Stop J586, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and Department of Chemistry, CB#3290, University of North Carolina, Chapel Hill, North Carolina 27599-3290.

Inorganic Chemistry
|October 24, 2001
PubMed
Summary
This summary is machine-generated.

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Time-resolved infrared spectroscopy reveals the excited state of ruthenium and osmium complexes. Evidence supports a localized electronic description for [Ru(III)(phen(*)(-)())(phen)(2)](2+) on the 100 ns timescale.

Area of Science:

  • Inorganic Chemistry
  • Photochemistry
  • Spectroscopy

Background:

  • Metal-to-ligand charge-transfer (MLCT) excited states are crucial in photochemistry.
  • Understanding the electronic structure of these excited states is key to their applications.
  • Ruthenium and osmium polypyridyl complexes are widely studied for their photophysical properties.

Purpose of the Study:

  • To investigate the electronic structure of MLCT excited states in [Ru(phen)(3)](2+) and [Os(phen)(DAS)(2)](2+).
  • To assign time-resolved infrared spectra by comparison with electrochemically generated species.
  • To provide insights into the electronic distribution and excited-state dynamics.

Main Methods:

  • Time-resolved infrared spectroscopy in the fingerprint region (1300-1700 cm(-1)).

Related Experiment Videos

  • Electrochemical generation of reference species: [Ru(III)(phen)(3)](3+) and [Ru(II)(phen(*)(-)())(phen)(2)](+).
  • Spectroscopic analysis in acetonitrile-d(3) at 298 K.

    • Main Results:

    • Assignment of time-resolved infrared spectra for the MLCT excited states.
    • Clear evidence for a localized electronic description, [Ru(III)(phen(*)(-)())(phen)(2)](2+), on the ~100 ns timescale.
    • Insights into electronic distribution within the excited states.

    Conclusions:

    • The study confirms a localized electronic description for the excited state of [Ru(phen)(3)](2+).
    • The findings aid in interpreting complex spectroscopic data, including resonance Raman spectra.
    • Difficulties in measuring ground- and excited-state resonance Raman spectra of phenanthroline complexes are suggested.