Physicochemical properties determined by Delta pK(a) for protic ionic liquids based on an organic super-strong base with various Bronsted acids

Neutralization of an organic super-strong base, 1,8-diazabicyclo-[5,4,0]-undec-7-ene (DBU), with different Bronsted acids affords a novel series of protic ionic liquids (PILs) with wide variations in the Delta pK(a) of the constituent amine and acids. The physicochemical properties of these PILs, such as thermal properties, density, conductivity, viscosity, self-diffusion coefficient, vibrational stretching frequency, and 1 H-chemical shifts of the N-H bond, have been studied in detail. The generated PILs have melting temperatures below 100 degrees C, and six are liquids at ambient temperatures. Thermogravimetric analyses (TGA) conducted under isothermal and programmed heating conditions have shown that PILs with Delta pK(a) >= 15 exhibit good thermal stability similar to aprotic ionic liquids. For instance, PILs with Delta pK(a) > 20 show remarkably high short-term thermal stability up to ca. 450 degrees C under a nitrogen atmosphere. The viscosity, ionic conductivity, and molar conductivity of the PILs fit well with the Vogel-Fulcher-Tamman equation for their dependencies on temperature. The relative cationic and anionic self-diffusion coefficients of the PILs estimated by the pulsed-field gradient spin-echo (PGSE) NMR method appear to be dependent on the structure and strength of the Bronsted acids. Evaluation of the ionicity based on both the Walden plot and PGSE-NMR revealed that it increases until Delta pK(a) becomes 15 for the PILs.