All chemical reagents, except for ionic liquid imidazolium cations, were purchased from Wako Pure Chemical Industries, Ltd. (Wako) (Tokyo, Japan) and Tokyo Chemical Industry Co., Ltd. (TCI) (Tokyo, Japan). 2,2′-Azobis(isobutyronitrile) (AIBN, Wako) was purified by recrystallization from ethanol before use, and the other reagents were employed as received. MAImC1 and [{CH2=C(CH3)COO(CH2)2}C3H3N2(C8H17)]+ (MAImC8) were prepared as iodide salt (MAImC1-I) and bromide salt (MAImC8-Br), respectively, according to the procedures described below.
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