Vibrational energy redistribution in Cp*Ir(CO)2 (Cp*=η5-pentamethylcyclopentadienyl) studied by broadband transient infrared spectroscopy
✍ Scribed by W.T. Grubbs; T.P. Dougherty; E.J. Heilweil
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 407 KB
- Volume
- 227
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Picosecond vibrational energy dynamics involving the symmetric (2020 cm-') and asymmetric (1953 cm-') CO-stretching modes of Cp*Ir( CO), in room temperature n-hexane is measured using mode specific infrared excitation followed by broadband infrared multichannel probing to generate a transient spectrum. The recovery of the transient bleaching and absorption bands, following 2020 or 1953 cm-' excitation, yields a u= 1 CO-stretching lifetime T, = 28 k 7 ( 1 u) ps. The transitions from v= 1 vibrational states give rise to new absorption features in the transient spectra at 2008, 1994, 1941 and 1930 cm-'. The time evolution of these absorptions monitors rapid energy redistribution and equilibration ( < 10 ps) between the symmetric and asymmetric CO-stretching modes prior to ground state recovery.