Relaxation Time Measurements in N-(1-Butyl)pyridinium-Aluminum Chloride Ambient Temperature Ionic Liquids

摘要

Proton spin-lattice relaxation times (T1) have been determined for the protons attached to the butyl moiety on the N-(1 butyl) pyridinium cation present in the room temperature molten salt system composed of mixtures of aluminium chloride with N-(1-butyl) pyridinium chloride at various mole ratios. Reorientational correlation times have been estimated from the data. From the viscosity dependence of these correlation times for protons in various positions on the butyl chain, it is shown that strong cation-anion interactions occur only when chloride anion is present in the melt. Also, the field dependence of the relaxation times has been analyzed to yield correlation times for the random motion giving rise to a relaxation mechanism. Keywords: Relaxation, Time viscosity, Correlations; Chloroaluminate molten salts.