Intermittent crystallization of an ionic liquid: 1-Isopropyl-3-methylimidazolium bromide

An ionic liquid, 1-isopropyl-3-methylimidazolium bromide ([i-C3mim]Br), crystallizes intermittently when it is cooled down from the pre-melting region. The phenomenon is the crystallization of the locally melted domains composed of different isomers of [i-C3mim]+. The domain consists of ∼1014 ion pairs.