Clark Ryan, Nawawi Mohd A, Dobre Ana, Pugh David, Liu Qingshan, Ivanov Aleksandar P, White Andrew J P, Edel Joshua B, Kuimova Marina K, McIntosh Alastair J S, Welton Tom
Department of Chemistry , Molecular Science Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , UK . Email:
Department of Chemistry , Kings College London , Britannia House, 7 Trinity Street , London , SE1 1DB , UK.
Chem Sci. 2020 May 27;11(24):6121-6133. doi: 10.1039/d0sc02009e. eCollection 2020 Jun 28.
The behaviour of two molecular rotors, one charged - 3,3'-diethylthiacarbocyanine iodide (Cy3) and one neutral - 8-[4-decyloxyphenyl]-4,4-difluoro-4-bora-3,4-diaza--indacene (BODIPY-C10), have been studied in various ionic liquids. The fluorescent decay lifetime has been used to elucidate the structure of the immediate region around the rotor. The neutral BODIPY-C10 was found to prefer the non-polar alkyl chain environment, leading to two trends in the lifetime of the dye: one when it was fully partitioned into the non-polar domain, and one when it also sampled polar moieties. The positively charged Cy3 dye showed a complex relationship between the bulk viscosity of the ionic liquid and lifetime of the molecular rotor. This was attributed to a combination of polarity related spectral changes, changes in anion cages around the dye, and temperature dependent fluorescent lifetimes alongside the dependence of the rotor upon the viscosity.
研究了两种分子转子在各种离子液体中的行为，一种是带电荷的3,3'-二乙基硫代碳菁碘化物（Cy3），另一种是中性的8-[4-癸氧基苯基]-4,4-二氟-4-硼-3,4-二氮杂-吲哚碳菁（BODIPY-C10）。荧光衰减寿命被用于阐明转子周围紧邻区域的结构。发现中性的BODIPY-C10更倾向于非极性烷基链环境，这导致染料寿命出现两种趋势：一种是当它完全分配到非极性域时，另一种是当它也接触极性部分时。带正电荷的Cy3染料在离子液体的本体粘度和分子转子寿命之间表现出复杂的关系。这归因于极性相关的光谱变化、染料周围阴离子笼的变化、温度依赖的荧光寿命以及转子对粘度的依赖性共同作用。
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