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首页> 外文期刊>Crystal growth & design >Influence of the Counteranion on the Ability of 1-Dodecyl-3-methyltriazolium Ionic Liquids to Form Mesophases
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Influence of the Counteranion on the Ability of 1-Dodecyl-3-methyltriazolium Ionic Liquids to Form Mesophases

机译：抗衡阴离子对1-十二烷基-3-甲基三唑鎓离子液体形成中间相的能力的影响

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摘要

The influence of the counteranion on the ability of the mesogenic cation 1-methyl-3-dodecyl-triazolium to form mesophases is explored. To that avail, salts of the cation with anions of different size, shape, and hydrogen bonding capability such as Cl-, Br-, I-, I-3(-), PF6-, and Tf2N- [bis(trifluorosulfonyl)amide] were synthesized and characterized. The crystal structures of the bromide, the iodide, and the triiodide reveal that the cations form bilayers with cations oriented in opposite directions featuring interdigitated alkyl tails. Within the layers, the cations are separated by anions. The rod-shaped triiodide anion forces the triazolium cation to align with it in this crystal structure but due to its space requirement reduces the alkyl chain interdigitation which prevents the formation of a mesophase. Rather the compound transforms directly from a crystalline solid to an (ionic) liquid like the analogous bis(trifluorosulfonyl)amide. In contrast, the simple halides and the hexafluorophosphate form liquid crystalline phases. Their clearing points shift with increasing anion radius to lower temperatures.
机译：探索了抗衡阴离子对介晶阳离子1-甲基-3-十二烷基-三唑鎓形成中间相的能力的影响。为此，阳离子具有不同大小，形状和氢键合能力的阴离子的盐，例如Cl-，Br-，I-，I-3（-），PF6-和Tf2N- [双（三氟磺酰基）酰胺合成并表征。溴化物，碘化物和三碘化物的晶体结构表明，阳离子形成双层，阳离子以相反的方向取向，并具有相互交叉的烷基尾巴。在这些层中，阳离子被阴离子分开。棒状三碘化物阴离子迫使三唑阳离子在该晶体结构中与其对齐，但由于其空间要求而降低了烷基链叉指，从而阻止了中间相的形成。而是该化合物直接从结晶固体转变为类似类似的双（三氟磺酰基）酰胺的（离子）液体。相反，简单的卤化物和六氟磷酸盐形成液晶相。它们的清除点随着阴离子半径的增加而转移到较低的温度。

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