NMR Study on Ion Dynamics and Phase Behavior of a Piperidinium-Based Room-Temperature Ionic Liquid: 1-Butyl-1-methylpiperidinium Bis(fluorosulfonyl)amide.

By use of pulse NMR methods, the temperature dependences of the longitudinal and transverse relaxation times for (1)H and (19)F were measured for the three phases of 1-butyl-1-methylpiperidinium bis(fluorosulfonyl)amide ([Pip1,4][FSA]), i.e., liquid or supercooled liquid, Cryst-α, and Cryst-β, to investigate the ion dynamics and phase behavior related to the dynamics.