イミダゾリウム系イオン液体の高圧相転移挙動

抄録

High pressure (HP) phase transition behavior of 1-alkyl-3-methylimidazolium-based ionic liquids ([C_nmim]-ILs) studied using optical spectroscopy was reviewed. On the whole, [C_nmim]-ILs under high pressure showed at least three transition patterns; (i) HP-glassy state, (ii) compression crystallization, and (iii) decompression crystallization. The glass transition pressure (p_g) and compression or decompression crystallization pressure (p_c or p_d.c) throughout the reported [C_nmim]-ILs were observed in the pressure range from 1.0 to 3.0 GPa for p_g, below 1.0 GPa for p_c, and below 2.0 GPa for p_d.c, respectively. We discussed the selectivity between the HP-glassy state and compression crystallization of [C_nmim]-ILs.