Vibrational relaxation of carbon monoxide in model heme compounds. 6-coordinate metalloporphyrins (M = Fe, Ru, OS)

Jeffrey R. Hill, Dana D. Dlott, M. D. Fayer, Kristen A. Peterson, Chris W. Rella, Michael M. Rosenblatt, Kenneth S Suslick, Christopher J. Ziegler

Research output: Contribution to journalArticle

Abstract

Vibrational relaxation of carbon monoxide bound to a series of metalloporphyrin complexes (M-(coproporphyrinate-I tetraisopropyl ester)(CO)(pyridine); M = Fe, Ru, Os) was measured using picosecond infrared pump-probe experiments. The vibrational relaxation rates ((1-2.5) × 1010 s-1) increased with increasing mass of the metal ion. This effect is opposite that predicted by through-σ-bond models and is interpreted as arising from a through-π-bond coupling between the CO vibrational fundamental and porphyrin vibrations.

Original languageEnglish (US)
Pages (from-to)218-223
Number of pages6
JournalChemical Physics Letters
Volume244
Issue number3-4
DOIs
StatePublished - Oct 6 1995

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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