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• W2078772016 abstract "Time-resolved phosphorescence spectra and anisotropy of quinoxaline were measured in an ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM-HFP), in its supercooled state near the glass-transition temperature. The solvation dynamics results are compared with the rotational motion of the probe and with the dielectric behavior of the neat ionic liquid. The dynamics in the viscous state are highly dispersive and show a super-Arrhenius temperature dependence, as typical for glass-forming materials. Combined with room-temperature results, solvation dynamics is observed to follow the structural relaxation times in terms of eta/T for more than 10 decades, from subnanoseconds at room temperature to seconds near the glass-transition temperature T(g). The dielectric modulus relaxation follows this trend only for temperatures T > 1.2T(g) and departs significantly from eta/T in the 1.1T(g) > T > T(g) range. This deviation is reminiscent of the enhanced translational diffusion or fractional Stokes-Einstein behavior observed in many fragile supercooled liquids. Because the electric field relaxation in BMIM-HFP includes dc conductivity, this correlation function involves translational motion and thus displays the effect of enhanced diffusivity. A microscopic model is required for rationalizing the decoupling of solvation dynamics from the longitudinal time scales and the limitation of this effect to the viscous regime with T < 1.2T(g)." @default.
• W2078772016 created "2016-06-24" @default.
• W2078772016 creator A5061938938 @default.
• W2078772016 creator A5066675483 @default.
• W2078772016 date "2006-10-04" @default.
• W2078772016 modified "2023-10-16" @default.
• W2078772016 title "Solvation Dynamics and Electric Field Relaxation in an Imidazolium-PF₆ Ionic Liquid: from Room Temperature to the Glass Transition" @default.
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• W2078772016 doi "https://doi.org/10.1021/jp0640023" @default.
• W2078772016 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17474705" @default.
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