Ultrafast relaxation and 2D IR of the aqueous trifluorocarboxylate ion
Source: J. Chem. Phys. 132, 044501 (2010); doi:10.1063/1.3285265
Published 22 January 2010
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The asymmetric stretching vibration of the amphiphilic trifluoroacetate ion and its 13C
16O isotopologue in D2O were investigated with infrared spectroscopy (FTIR), ultrafast infrared pump probe, and two dimensional vibrational photon echo techniques and simulations. Trifluoroacetate ions have a nonexponential depopulation of the first vibrational excited state, which is well described by a kinetic mechanism involving a temperature dependent solvent assisted relaxation to the symmetric stretch mode. The vibrational spectrum of the asymmetric stretch of the 13C
16O isotopologue presents an unusual spectral shape. The frequency-frequency autocorrelation function shows a static term not present in the 13C
16O form, which is caused by an accidental degeneracy with a combinational mode. A newly developed frequency map for carboxylate is used to characterize the processes and dynamics observed in the frequency fluctuations of the carboxylate asymmetric stretch mode in aqueous solution. An assignment of the molecular processes that govern the frequency fluctuations is suggested from an analysis of the solvation shell configurations obtained from molecular dynamics simulations.
©2010 American Institute of Physics
16O isotopologue in D2O were investigated with infrared spectroscopy (FTIR), ultrafast infrared pump probe, and two dimensional vibrational photon echo techniques and simulations. Trifluoroacetate ions have a nonexponential depopulation of the first vibrational excited state, which is well described by a kinetic mechanism involving a temperature dependent solvent assisted relaxation to the symmetric stretch mode. The vibrational spectrum of the asymmetric stretch of the 13C
16O isotopologue presents an unusual spectral shape. The frequency-frequency autocorrelation function shows a static term not present in the 13C
16O form, which is caused by an accidental degeneracy with a combinational mode. A newly developed frequency map for carboxylate is used to characterize the processes and dynamics observed in the frequency fluctuations of the carboxylate asymmetric stretch mode in aqueous solution. An assignment of the molecular processes that govern the frequency fluctuations is suggested from an analysis of the solvation shell configurations obtained from molecular dynamics simulations.
©2010 American Institute of Physics
| History: | Received 28 October 2009; accepted 12 December 2009; published 22 January 2010 |
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http://link.aip.org/link/?JCPSA6/132/044501/1 |
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