Citation: YANG Fan, LIU Ying-Liang, WANG Jian-Ping. Mid-Infrared Pump-Probe Spectroscopy of Dimeric π-Cyclopentadienyl-dicarbonyliron [CpFe(CO)₂]₂[J]. Acta Physico-Chimica Sinica, ;2012, 28(04): 759-765. doi: 10.3866/PKU.WHXB201202023 shu

Mid-Infrared Pump-Probe Spectroscopy of Dimeric π-Cyclopentadienyl-dicarbonyliron [CpFe(CO)₂]₂

1.
Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

Received Date: 11 November 2011
Available Online: 2 February 2012
Fund Project: 国家自然科学基金(20727001) (20727001) 中国科学院知识创新工程(KJCX2-EW-H01) (KJCX2-EW-H01)

The structural and vibrational dynamics of the non-bridged C≡O stretching vibrations of two different tautomers of dimeric π-cyclopentadienyldicarbonyliron [CpFe(CO)₂]₂ in CH₂Cl₂ were examined using steady-state and femtosecond infrared pump-probe methods at 5-μm wavelength. The two main species in [CpFe(CO)₂]₂ had a cis:trans molar ratio of 1.7, and showed different vibrational and rotational relaxation dynamics. Both species showed biexponential decay in their two C≡O stretching vibrational excited-state populations, with a fast component (<1 ps) and a slow component (20 ps). The former was believed to be related to the rapid dephasing processes of the coherent state caused by broadband excitation, while the latter was the typical lifetime for the C≡O stretching vibrational excited state. Having a significant permanent dipole, the cis structure could interact strongly with solvent, resulting in relatively slower rotational dynamics. Our work demonstrated that the frequency and vibrational-rotational dynamics of the non-bridged C≡O stretching vibrations were very sensitive to both molecular structures and the solvent.
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沈阳化工大学材料科学与工程学院沈阳 110142

Mid-Infrared Pump-Probe Spectroscopy of Dimeric π-Cyclopentadienyl-dicarbonyliron [CpFe(CO)2]2

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Mid-Infrared Pump-Probe Spectroscopy of Dimeric π-Cyclopentadienyl-dicarbonyliron [CpFe(CO)₂]₂