Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Ultrafast Investigation of Vibrational Relaxation and Solvent Coordination Following Photodissociation of Cr$(CO)_6$

  • Seok-Beum Ko (Department of Chemistry Eaucation, Chonbuk National University) ;
  • Soo-Chang Yu (Department of Chemistry, Kunsan National University) ;
  • J. B. Hopkins (Department of Chemistry, Lousiana State University)
  • Published : 1994.09.20
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Abstract

Picosecond time-resolved resonance Raman spectroscopy has been used to study the photochemistry of Cr(CO$)_6$ in cyclohexane following photoexcitation at 266 nm. Photodissociative loss of CO is found to occur within our pulse width of ${\leq}$5 ps by probing the 533 c$m^{-1}$ vibrational mode of ground state Cr(CO$)_6$. The subsequent dynamics after photodissociation are interpreted in terms of solvation, vibrational and electronic relaxations. The vibrational relaxation time of 100 ps and 83 ps are observed by monitoring v=O and v=l of the 381 c$m^{-1}$ transient mode, respectively. No evidence was found for solvation and electronic relaxation occurring on a time scale of ${\leq}$5 ps.

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