VIBRATIONAL-RELAXATION OF CARBON-MONOXIDE IN MODEL HEME COMPOUNDS - 6-COORDINATE METALLOPORPHYRINS (M=FE, RU, OS)

Authors
HILL JR DLOTT DD FAYER MD PETERSON KA RELLA CW ROSENBLATT MM SUSLICK KS ZIEGLER CJ
Citation
Jr. Hill et al., VIBRATIONAL-RELAXATION OF CARBON-MONOXIDE IN MODEL HEME COMPOUNDS - 6-COORDINATE METALLOPORPHYRINS (M=FE, RU, OS), Chemical physics letters, 244(3-4), 1995, pp. 218-223
Citations number
29
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
Chemical physics letters → ACNP
ISSN journal
00092614
Volume
244
Issue
3-4
Year of publication
1995
Pages
218 - 223
Database
ISI
SICI code
0009-2614(1995)244:3-4<218:VOCIMH>2.0.ZU;2-0
Abstract
Vibrational relaxation of carbon monoxide bound to a series of metallo porphyrin 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) X 10(10) s(-1))increased with increasing mass of the metal ion. This effect is opposite that predicted by through-sigma-bond models and is interpret ed as arising from a through-pi-bond coupling between the CO vibration al fundamental and porphyrin vibrations.