Title of article :
Vibrational relaxation of carbon monoxide in model heme compounds. 6-coordinate metalloporphyrins (M = Fe, Ru, OS)
Author/Authors :
Hill، نويسنده , , Jeffrey R. and Dlott، نويسنده , , Dana D. and Fayer، نويسنده , , M.D. and Peterson، نويسنده , , Kristen A. and Rella، نويسنده , , Chris W. and Rosenblatt، نويسنده , , Michael M. and Suslick، نويسنده , , Kenneth S. and Ziegler، نويسنده , , Christopher J.، نويسنده ,
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.
