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

Kristin M. Omberg; Jon R. Schoonover; Stefan Bernhard; John A. Moss; Joseph A. Treadway; Edward M. Kober; R. Brian Dyer; Thomas J. Meyer

doi:10.1021/ic971554e

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

Inorg Chem. 1998 Jul 13;37(14):3505-3508. doi: 10.1021/ic971554e.

Authors

Kristin M. Omberg¹, Jon R. Schoonover, Stefan Bernhard, John A. Moss, Joseph A. Treadway, Edward M. Kober, R. Brian Dyer, Thomas J. Meyer

Affiliation

¹ Bioscience 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.

PMID: 11670434
DOI: 10.1021/ic971554e

Abstract

Time-resolved infrared spectra in the fingerprint region (1300-1700 cm(-)(1)) are reported for the metal-to-ligand charge-transfer (MLCT) excited state(s) of [Ru(phen)(3)](2+) and [Os(phen)(DAS)(2)](2+) (phen is 1,10-phenanthroline; DAS is 1,2-bis(diphenylarsino)ethane) in acetonitrile-d(3) at 298 K. The spectra are assigned by comparison to electrochemically generated [Ru(III)(phen)(3)](3+) and [Ru(II)(phen(*)(-)())(phen)(2)](+). The data provide clear evidence for the localized description [Ru(III)(phen(*)(-)())(phen)(2)](2+) on the approximately 100 ns time scale. They also give insight into electronic distribution in the excited state, aid in the interpretation of the time-resolved resonance Raman spectrum of [Ru(phen)(3)](2+), and suggest why measuring ground- and excited-state resonance Raman spectra of phen complexes is difficult.