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How Does Water Affect the Dynamics of the Room-Temperature Ionic Liquid 1-hexyl-3-methylimidazolium Hexafluorophosphate and the Fluorescence Spectroscopy of Coumarin-153 When Dissolved in It?

How Does Water Affect the Dynamics of the Room-Temperature Ionic Liquid 1-hexyl-3-methylimidazolium Hexafluorophosphate and the Fluorescence Spectroscopy of Coumarin-153 When Dissolved in It?

Harsha V R Annapureddy, Zhonghan Hu, Junchao Xia, Claudio J Margulis

J Phys Chem B. 2008 Feb 14;112(6):1770-6.

PMID: 18198862

Abstract:

Molecular dynamics simulations of mixtures of 1-hexyl-3-methylimidazolium hexafluorophosphate ([HMIM+][PF6-]) and water have been performed in order to investigate how small amounts of water affect the translational and rotational dynamics of this ionic liquid (IL). We find that water is closely associated with the anions and that its presence enhances both the translational and rotational dynamics of the IL. In agreement with experiments, we find that the fluorescence spectra of Coumarin-153 is red-shifted because of the presence of water. Small amounts of water enhance the speed of relaxation of the solvent surrounding the solute probe after photoexcitation, but only at a "local environment" level. Interconversion between environments still occurs on a long time scale compared with the fluorescence lifetime of the probe. Excitation wavelength-dependent emission is observed both in the neat IL and in the IL+water mixture.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP304680351	1-Hexyl-3-methylimidazolium hexafluorophosphate		304680-35-1	Price

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