AbstractIonic complexes consisting of a mesogenic cholesterol derivative and 1-alkyl (Cn)-3-methylimidazolium (CnMim) (n = 6–18) were prepared from ethanol solutions containing an equimolar mixture of cholesterol hydrogen phthalate (CHP) and 1-Cn-3-methylimidazolium hydroxide; the imidazolium hydroxide was obtained by anion exchange of 1-Cn-3-methylimidazolium bromide. The complex samples, termed [CnMim][CHP], were examined to evaluate their thermal transition patterns. Excluding the two samples (n = 6, 8) that showed no definite ordered phase, the complexes with n ≥ 10 formed a cholesteric (n = 10, 12) or smectic (n = 14–18) mesophase in a considerably wide range of temperatures; this wide range reflects the additional thermotropic property of the salts of CnMim with longer alkyl chains. These fluid mesophases transformed into a mesomorphic vitreous solid without crystallization in a usual cooling process. For the glassy mesomorphic samples of selected complexes (n = 10, 18), the enthalpy relaxation behavior was followed as a function of the aging temperature and time, and the data were analyzed in terms of a Kohlrausch–Williams–Watts (KWW) type of stretched exponential equation. A very narrow distribution of relaxation times was observed for the “liquid crystalline glasses”, indicating the high uniformity of the relaxation mode.We prepared a series of ionic complexes, [CnMim][CHP] (n = 6–18), by neutralizing cholesterol hydrogen phthalate (CHP) with 1-alkyl (Cn)-3-methylimidazolium hydroxide ([CnMim][OH]) derived from [CnMim][Br]. The complexes of n ≥ 10 formed a thermotropic mesophase in each individual temperature range and solidified into a mesomorphic glass upon cooling, although two samples of n = 6 and 8 showed no ordered structure. Enthalpy relaxation behavior of the mesomorphic glasses (n = 10, 18) was also examined as a function of the aging temperature and time

中文翻译：

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由胆固醇邻苯二甲酸酯和 1-Cn-3-甲基咪唑鎓组成的介晶玻璃形成离子复合物：相变和焓弛豫行为

摘要 由介晶胆固醇衍生物和 1-烷基 (Cn)-3-甲基咪唑鎓 (CnMim) (CnMim) (n = 6-18) 组成的离子复合物由含有等摩尔胆固醇邻苯二甲酸氢盐 (CHP) 和 1-Cn- 3-甲基咪唑鎓氢氧化物；氢氧化咪唑鎓由1-Cn-3-甲基咪唑鎓溴化物阴离子交换得到。检查称为 [CnMim][CHP] 的复杂样品以评估它们的热转变模式。排除没有显示明确有序相的两个样品 (n = 6, 8)，n ≥ 10 的配合物在相当广泛的范围内形成胆甾型 (n = 10, 12) 或近晶 (n = 14-18) 中间相温度；这个宽范围反映了具有更长烷基链的 CnMim 盐的额外热致特性。这些流体中间相在通常的冷却过程中转变为介晶玻璃状固体而没有结晶。对于所选配合物（n = 10, 18）的玻璃态介晶样品，焓弛豫行为是老化温度和时间的函数，并根据 Kohlrausch-Williams-Watts (KWW) 类型对数据进行分析拉伸指数方程。观察到“液晶玻璃”的弛豫时间分布非常窄，表明弛豫模式的高度均匀性。我们通过中和制备了一系列离子配合物 [CnMim][CHP] (n = 6-18)胆固醇邻苯二甲酸氢盐 (CHP) 与衍生自 [CnMim][Br] 的 1-烷基 (Cn)-3-甲基咪唑鎓氢氧化物 ([CnMim][OH])。n ≥ 10 的配合物在每个单独的温度范围内形成热致中间相，并在冷却时固化成介晶玻璃，尽管 n = 6 和 8 的两个样品没有显示出有序结构。介晶玻璃（n = 10, 18）的焓弛豫行为也作为老化温度和时间的函数进行了检查