Issue 5, 2018

Real-time observation of the photoionization-induced water rearrangement dynamics in the 5-hydroxyindole–water cluster by time-resolved IR spectroscopy

Abstract

Solvation plays an essential role in controlling the mechanism and dynamics of chemical reactions in solution. The present study reveals that changes in the local solute–solvent interaction have a great impact on the timescale of solvent rearrangement dynamics. Time-resolved IR spectroscopy has been applied to a hydration rearrangement reaction in the monohydrated 5-hydroxyindole–water cluster induced by photoionization of the solute molecule. The water molecule changes the stable hydration site from the indolic NH site to the substituent OH site, both of which provide a strongly attractive potential for hydration. The rearrangement time constant amounts to 8 ± 2 ns, and is further slowed down by a factor of more than five at lower excess energy. These rearrangement times are slower by about three orders of magnitude than those reported for related systems where the water molecule is repelled from a repulsive part of the interaction potential toward an attractive well. The excess energy dependence of the time constant is well reproduced by RRKM theory. Differences in the reaction mechanism are discussed on the basis of energy relaxation dynamics.

Graphical abstract: Real-time observation of the photoionization-induced water rearrangement dynamics in the 5-hydroxyindole–water cluster by time-resolved IR spectroscopy

Supplementary files

Article information

Article type
Paper
Submitted
08 9 2017
Accepted
25 10 2017
First published
27 10 2017

Phys. Chem. Chem. Phys., 2018,20, 3079-3091

Real-time observation of the photoionization-induced water rearrangement dynamics in the 5-hydroxyindole–water cluster by time-resolved IR spectroscopy

M. Miyazaki, A. Naito, T. Ikeda, J. Klyne, K. Sakota, H. Sekiya, O. Dopfer and M. Fujii, Phys. Chem. Chem. Phys., 2018, 20, 3079 DOI: 10.1039/C7CP06127G

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