Peculiar High-Pressure Phase Behavior of 1-Butyl-3-Methylimidazolium Iodide
Takahiro Takekiyo and Yukihiro Yoshimura
The Journal of Physical Chemistry B
We investigated the stability of the liquid phase of 1-butyl-3-methylimidazolium iodide (hereafter abbreviated as [C4mim][I]) up to 16.7 GPa at room temperature. We observed a peculiar phase transition behavior in the [C4mim][I] sample. In particular, a glassy state was formed at ~1.3 GPa; however, the reddish–brown precipitate was probably due to concentrated I3− or I2− species that were formed above 12 GPa; [C4mim][I] showed a pressure-induced partial crystallization from the glassy state. We concluded that the conformation of [C4mim]+ is essential in iterative modulation to control the environmental formation of iodide precipitate.