Vibrational relaxation of carbon monoxide in model heme compounds. 6-coordinate metalloporphyrins (M = Fe, Ru, OS)
✍ Scribed by Jeffrey R. Hill; Dana D. Dlott; M.D. Fayer; Kristen A. Peterson; Chris W. Rella; Michael M. Rosenblatt; Kenneth S. Suslick; Christopher J. Ziegler
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 437 KB
- Volume
- 244
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Vibrational relaxation of carbon monoxide bound to a series of metalloporphyrin complexes (M-(coproporphyrinate-I tetraisopropyl ester)(COXpyridine); M = Fe, Ru, Os) was measured using picosecond infrared pump-probe experiments. The vibrational relaxation rates ((1-2.5) × 101° s-1) increased with increasing mass of the metal ion. This effect is opposite that predicted by through-g-bond models and is interpreted as arising from a through--n-bond coupling between the CO vibrational fundamental and porphyrin vibrations.