Takekiyo T, Yoshimura Y. Peculiar High-Pressure Phase Behavior of 1-Butyl-3-methylimidazolium Iodide.
J Phys Chem B 2020;
124:7659-7667. [PMID:
32701280 DOI:
10.1021/acs.jpcb.0c04954]
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Abstract
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 formed 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.
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