Volume 177, 2015
From the journal:

Faraday Discussions

Vibrational dynamics of the CO stretching of 9-fluorenone studied by visible-pump and infrared-probe spectroscopy

Yuki Fukui,a   Kaoru Ohtaa  and  Keisuke Tominaga*a  

* Corresponding authors

a Department of Chemistry, Graduate School of Science, Kobe University, Molecular Photoscience Research Center, Kobe University, Nada, Kobe, Japan
E-mail: tominaga@kobe-u.ac.jp

Abstract

We studied the effects of hydrogen bonds on the vibrational structures and vibrational dynamics of the CO stretching mode of 9-fluorenone (FL) in the electronically excited state in aprotic and protic solvents using sub-picosecond visible-pump and IR-probe spectroscopy. The transient IR spectrum of the CO stretching band in methanol-d4 has two bands at 1529.9 cm−1 and 1543.4 cm−1, which are assigned to an FL-solvent complex and free FL, respectively. In the aprotic solvents, the CO stretching bands show blue-shifts in time. This shift is due to vibrational cooling, which is derived from anharmonic couplings with some low-frequency modes. Interestingly, a red-shift is observed at later delay time for the band at 1529.9 cm−1 in methanol-d4. A possible mechanism of this spectral shift is related to the hydrogen bond dynamics between the solute and solvent.

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Article information

DOI
https://doi.org/10.1039/C4FD00169A
Article type
Paper
Submitted
08 Sep 2014
Accepted
19 Nov 2014
First published
09 Feb 2015

Faraday Discuss., 2015,177, 65-75

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Vibrational dynamics of the CO stretching of 9-fluorenone studied by visible-pump and infrared-probe spectroscopy

Y. Fukui, K. Ohta and K. Tominaga, Faraday Discuss., 2015, 177, 65 DOI: 10.1039/C4FD00169A

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