Observations of probe dependence of the solvation dynamics in ionic liquids

Xin Xing Zhang, Jens Breffke, Nikolaus P. Ernsting, Mark Maroncelli

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Solvation and rotational dynamics of 4-aminophthalimide (4AP) in four ionic liquids (ILs) are measured using a combination of fluorescence upconversion spectroscopy and time-correlated single photon counting. These data are compared with previously reported data for coumarin 153 (C153) to investigate the probe dependence of solvation dynamics. No fast component (<15 ps) in the fluorescence anisotropy is observed with 4AP. The differences between the solvation response functions of 4AP and C153 are significant in all four ILs, but these differences can be reduced by applying a correction for solute rotation using measured emission anisotropies. Response functions of other probes available in the literature are used to further examine the validity of this correction. The corrected data are also compared to predictions of dielectric continuum models of solvation. By replacing the measured static conductivity of the ILs with an estimated value, such predictions show good agreement with the observed spectral response functions, especially when the anion size is small.

Original languageEnglish (US)
Pages (from-to)12949-12956
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume17
Issue number19
DOIs
StatePublished - May 21 2015

Fingerprint

Ionic Liquids
Solvation
solvation
probes
liquids
Anisotropy
fluorescence
anisotropy
Fluorescence spectroscopy
predictions
spectral sensitivity
Anions
counting
solutes
Photons
Fluorescence
anions
continuums
conductivity
photons

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Zhang, Xin Xing ; Breffke, Jens ; Ernsting, Nikolaus P. ; Maroncelli, Mark. / Observations of probe dependence of the solvation dynamics in ionic liquids. In: Physical Chemistry Chemical Physics. 2015 ; Vol. 17, No. 19. pp. 12949-12956.
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Observations of probe dependence of the solvation dynamics in ionic liquids. / Zhang, Xin Xing; Breffke, Jens; Ernsting, Nikolaus P.; Maroncelli, Mark.

In: Physical Chemistry Chemical Physics, Vol. 17, No. 19, 21.05.2015, p. 12949-12956.

Research output: Contribution to journalArticle

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AU - Zhang, Xin Xing

AU - Breffke, Jens

AU - Ernsting, Nikolaus P.

AU - Maroncelli, Mark

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N2 - Solvation and rotational dynamics of 4-aminophthalimide (4AP) in four ionic liquids (ILs) are measured using a combination of fluorescence upconversion spectroscopy and time-correlated single photon counting. These data are compared with previously reported data for coumarin 153 (C153) to investigate the probe dependence of solvation dynamics. No fast component (<15 ps) in the fluorescence anisotropy is observed with 4AP. The differences between the solvation response functions of 4AP and C153 are significant in all four ILs, but these differences can be reduced by applying a correction for solute rotation using measured emission anisotropies. Response functions of other probes available in the literature are used to further examine the validity of this correction. The corrected data are also compared to predictions of dielectric continuum models of solvation. By replacing the measured static conductivity of the ILs with an estimated value, such predictions show good agreement with the observed spectral response functions, especially when the anion size is small.

AB - Solvation and rotational dynamics of 4-aminophthalimide (4AP) in four ionic liquids (ILs) are measured using a combination of fluorescence upconversion spectroscopy and time-correlated single photon counting. These data are compared with previously reported data for coumarin 153 (C153) to investigate the probe dependence of solvation dynamics. No fast component (<15 ps) in the fluorescence anisotropy is observed with 4AP. The differences between the solvation response functions of 4AP and C153 are significant in all four ILs, but these differences can be reduced by applying a correction for solute rotation using measured emission anisotropies. Response functions of other probes available in the literature are used to further examine the validity of this correction. The corrected data are also compared to predictions of dielectric continuum models of solvation. By replacing the measured static conductivity of the ILs with an estimated value, such predictions show good agreement with the observed spectral response functions, especially when the anion size is small.

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