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research article

Hydrophobicity with atomic resolution: Steady-state and ultrafast X-ray absorption and molecular dynamics studies

Penfold, Thomas J.
•
Milne, Christopher J.  
•
Tavernelli, Ivano
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2013
Pure And Applied Chemistry

Static and time-resolved X-ray absorption spectroscopy (XAS) is used to probe the solvent shell structure around iodide and iodine. In particular, we characterize the changes ob served upon electron abstraction of aqueous iodide, which reflects the transition from hydrophilic to hydrophobic solvation after impulsive electron abstraction from iodide. The static spectrum of aqueous iodide, which is analyzed using quantum mechanical/molecular mechanics (QM/MM) molecular dynamics (MD) simulations, indicates that the hydrogens of the closest water molecules point toward the iodide, as expected for hydrophilic solvation. In addition, these simulations demonstrate a small anisotropy in the solvent shell. Following electron abstraction, most of the water molecules move away from iodine, while one comes closer to form a complex with it that survives 3-4 ps. This lifetime is governed by the reorganization of the main solvation shell, basically the time it takes for the water molecules to reform a hydrogen bond network in the hydrophobic solvation shell.

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Type
research article
DOI
10.1351/Pac-Con-12-04-02
Web of Science ID

WOS:000313885300006

Author(s)
Penfold, Thomas J.
Milne, Christopher J.  
Tavernelli, Ivano
Chergui, Majed  
Date Issued

2013

Publisher

De Gruyter

Published in
Pure And Applied Chemistry
Volume

85

Issue

1

Start page

53

End page

60

Subjects

halides

•

hydrophobicity

•

ultrafast spectroscopy

•

X-ray absorption spectroscopy

•

X-ray structure

Note

National Licences

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSU  
Available on Infoscience
March 28, 2013
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/90971
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