VIBRATIONAL-RELAXATION OF THE CO STRETCH VIBRATION IN HEMOGLOBIN-CO, MYOGLOBIN-CO, AND PROTOHEME-CO

Authors
OWRUTSKY JC LI M LOCKE B HOCHSTRASSER RM
Citation
Jc. Owrutsky et al., VIBRATIONAL-RELAXATION OF THE CO STRETCH VIBRATION IN HEMOGLOBIN-CO, MYOGLOBIN-CO, AND PROTOHEME-CO, Journal of physical chemistry, 99(13), 1995, pp. 4842-4846
Citations number
46
Categorie Soggetti
Chemistry Physical
Journal title
Journal of physical chemistry → ACNP
ISSN journal
00223654
Volume
99
Issue
13
Year of publication
1995
Pages
4842 - 4846
Database
ISI
SICI code
0022-3654(1995)99:13<4842:VOTCSV>2.0.ZU;2-7
Abstract
Two-color infrared pump-infrared probe spectroscopy has been used to m easure vibrational relaxation times (T-1) for the CO stretching vibrat ions of carboxyhemoglobin (HbCO), carboxymyoglobin (MbCO), and carboxy protoheme, all in D2O at 300 K. The times are fast (17-31 ps) compared to most previously measured metal carbonyl T-1 times. The CO relaxati on is found to be somewhat faster in HbCO and MbCO than in PCO. The tr ansient infrared spectra and anisotropy were also measured.