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Cited by 310

The DOI matches its Crossref record; 35 of the 35 references it cites were found in a registry or an index.

Solvation and Rotational Dynamics of Coumarin 153 in Ionic Liquids: Comparisons to Conventional Solvents

Jin, Hui, Baker, Gary A., Arzhantsev, Sergei, Dong, Jing, Maroncelli, Mark·2007·The Journal of Physical Chemistry B
DOI 10.1021/jp070923h
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Abstract

Steady-state and time-resolved emission spectroscopy with 25 ps resolution are used to measure equilibrium and dynamic aspects of the solvation of coumarin 153 (C153) in a diverse collection of 21 room-temperature ionic liquids. The ionic liquids studied here include several phosphonium and imidazolium liquids previously reported as well as 12 new ionic liquids that incorporate two homologous series of ammonium and pyrrolidinium cations. Steady-state absorption and emission spectra are used to extract solvation free energies and reorganization energies associated with the S0 <--> S1 transition of C153. These quantities, especially the solvation free energy, vary relatively little in ionic liquids compared to conventional solvents. Some correlation is found between these quantities and the mean separation between ions (or molar volume). Time-resolved anisotropies are used to observe solute rotation. Rotation times measured in ionic liquids correlate with solvent viscosity in much the same way that they do in conventional polar solvents. No special frictional coupling between the C153 and the ionic liquid solvents is indicated by these times. But, in contrast to what is observed in most low-viscosity conventional solvents, rotational correlation functions in ionic liquids are nonexponential. Time-resolved Stokes shift measurements are used to characterize solvation dynamics. The solvation response functions in ionic liquids are also nonexponential and can be reasonably represented by stretched-exponential functions of time. The solvation times observed are correlated with the solvent viscosity, and the much slower solvation in ionic liquids compared to dipolar solvents can be attributed to their much larger viscosities. Solvation times of the majority of ionic liquids studied appear to follow a single correlation with solvent viscosity. Only liquids incorporating the largest phosphonium cation appear to follow a distinctly different correlation.

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Metadata

Authors
Jin, H., Baker, G. A., Arzhantsev, S., Dong, J., & Maroncelli, M.
Venue
The Journal of Physical Chemistry B
Publisher
American Chemical Society (ACS)
Published
2007-05-27
Volume
111
Issue
25
Pages
7291-7302
ISSN
  • 1520-5207 (ISSN-L)
  • 1520-6106
DOI
10.1021/jp070923h
OpenAlex
W2082874741
Cited by
310
References
35
FWCI
14.30
Type
journal article
Language
en
Open access
closed

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