Conductivity and Solvation Dynamics in Ionic Liquids.
It was shown recently that a simple dielectric continuum model predicts the integral solvation time of a dipolar solute ⟨τsolv⟩ to be inversely proportional to the electrical conductivity σ0 of an ionic solvent or solution. In this Letter, we provide a more general derivation of this connection and show that available data on coumarin 153 (C153) in ionic liquids generally support this prediction. The relationship between solvation time and conductivity can be expressed by ln(⟨τsolv⟩/ps) = 4.37 - 0.92 ln (σ0/S m(-1)) in 34 common ionic liquids.
†Department of Physics, Nankai University, Tianjin, China.|‡Department of Chemistry, Humboldt Universität zu Berlin, Germany.
Xin-Xing
XX
Zhang
§Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania, United States.
Min
M
Liang
‡Department of Chemistry, Humboldt Universität zu Berlin, Germany.
Nikolaus P
NP
Ernsting
§Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania, United States.
Mark
M
Maroncelli
conductivity; coumarin 153; dielectric continuum theory; ionic liquids; room-temperature ionic liquids; solvation dynamics