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Light-modulated aggregation behavior of some unsubstituted cinnamate-based ionic liquids in aqueous solutions

机译：某些未取代的基于肉桂酸酯的离子液体在水溶液中的光调制聚集行为

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摘要

Light modulation of the self-assembly behavior of ionic liquids in aqueous solution is of great importance from the viewpoint of fundamentals and technology. In this work, a new class of light-responsive ionic liquids composed of 1-alkyl-3-methylimidazolium cations, [C(n)mim](+) (n = 4, 6, 8, 10, 12), and the trans-cinnamic acid ([CA]) anion was synthesized and characterized. These compounds were used to study the modulation action of UV light on the aggregation behavior of ionic liquids in aqueous solution. For this purpose, the critical aggregation concentration (CAC), ionization degree of the aggregates (a), standard Gibbs energy of aggregation (Delta Gm degrees) and aggregate size of the ionic liquids were determined before and after UV light irradiation by conductivity and dynamic light scattering techniques. The percentage of cis-isomer of these ionic liquids was also reported at the photoisomerism equilibrium from HPLC measurements. It was found that the aggregation behavior of [C(n)mim][CA] (n = 8, 10, 12) could be efficiently modulated by UV light in aqueous solution. After UV light irradiation, the values of CAC, a and Delta Gm degrees increased, while the size of the aggregates decreased. These results have been rationalized from the photo-isomerization of the [CA] anion, hydrophilicity and structural features of the cis-isomer of the [CA] anion.
机译：从基本原理和技术的观点来看，水溶液中离子液体的自组装行为的光调制非常重要。在这项工作中，一类新型的由1-烷基-3-甲基咪唑鎓阳离子，[C（n）mim]（+）（n = 4、6、8、10、12）和合成并表征了反式肉桂酸（[CA]）阴离子。这些化合物用于研究紫外线对水溶液中离子液体聚集行为的调节作用。为此，通过电导率和动态测定了紫外线照射前后的临界聚集浓度（CAC），聚集体的电离度（a），标准吉布斯聚集能（ΔGm度）和离子液体的聚集体尺寸。光散射技术。这些离子液体的顺式异构体的百分比也通过HPLC测量在光异构平衡时报告。结果发现，[C（n）mim] [CA]（n = 8、10、12）的聚集行为可以通过水溶液中的紫外线有效地调节。紫外线照射后，CAC，α和Delta Gm度的值增加，而聚集体的大小减小。这些结果已通过[CA]阴离子的光异构化，[CA]阴离子的顺式异构体的亲水性和结构特征得到合理化。

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