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首页> 外文期刊>RSC Advances >Modification of the photophysics of 3-hydroxyflavone in aqueous solutions of imidazolium-based room temperature ionic liquids: a comparison between micelle-forming and non micelle-forming ionic liquids
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Modification of the photophysics of 3-hydroxyflavone in aqueous solutions of imidazolium-based room temperature ionic liquids: a comparison between micelle-forming and non micelle-forming ionic liquids

机译：咪唑基室温离子液体的水溶液中3-羟基黄酮的光物理修饰：形成胶束和不形成胶束的离子液体的比较

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摘要

In the present article, we have investigated the photophysical behavior of 3-hydroxyflavone (3HF), an excited state intramolecular proton transfer (ESIPT) probe, in aqueous solutions of two imidazolium-based room temperature ionic liquids (RTILs), one micelle-forming and the other non micelle-forming, exploiting steady state and time resolved fluorometric techniques. The study unveils that the ESIPT process of 3HF is modified substantially in the micelle-forming RTIL as compared to that in the other RTIL. The critical micellar concentration (CMC) of the micelle-forming RTIL has been determined from both steady state and time resolved data. The study suggests that 3HF resides within the micellar phase and experiences a significantly less polar environment in its vicinity than in the non micelle-forming ionic liquid. A comparative study with the probe in the micelle-forming ionic liquid and a conventional anionic surfactant of a similar hydrophobic chain length reveals that 3HF experiences an appreciably less polar environment in the RTIL micelle as compared to the conventional anionic micelle.
机译：在本文中，我们研究了在两种咪唑基室温离子液体（RTIL）的水溶液中，一种形成胶束的3-羟基黄酮（3HF）（一种激发态分子内质子转移（ESIPT）探针）的光物理行为。和其他非胶束形成，利用稳态和时间分辨荧光技术。该研究表明，与其他RTIL相比，形成胶束的RTIL对3HF的ESIPT工艺进行了重大改进。已从稳态和时间分辨数据确定了形成胶束的RTIL的临界胶束浓度（CMC）。研究表明3HF驻留在胶束相中，并且与非胶束形成离子液体相比，其周围的极性环境明显更少。用探针在形成胶束的离子液体和具有相似疏水链长度的常规阴离子表面活性剂中进行的比较研究表明，与常规阴离子胶束相比，3HF在RTIL胶束中的极性环境明显减少。

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