# Characterization of Room-Temperature Ionic Liquids by the Abraham Model with Cation-Specific and Anion-Specific Equation Coefficients

journal contribution

posted on 29.05.2007, 00:00 by Laura Sprunger, Michael Clark, William E. Acree, Michael H. AbrahamGas-to-RTIL (room-temperature ionic liquid) partition coefficients have been compiled for 592 different
solute-RTIL combinations. These partition coefficients were converted into water-to-RTIL partition
coefficients using the corresponding gas-to-water partition coefficients. Both sets of partition coefficients
were analyzed using the Abraham solvation parameter model with cation-specific and anion-specific equation
coefficients. The derived equations correlated the experimental gas-to-RTIL and water-to-RTIL partition
coefficient data to within 0.10 and 0.14 log units, respectively. The 8 sets of calculated cation-specific
equation coefficients and 4 sets of calculated anion-specific equation coefficients can be combined to yield
expressions capable of predicting the partition coefficients of solutes in 32 different RTILs.