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首页> 外文期刊>RSC Advances >Influence of double confinement on photophysics of 7-(diethylamino)coumarin-3-carboxylic acid in water/AOT/isooctane reverse micelles
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Influence of double confinement on photophysics of 7-(diethylamino)coumarin-3-carboxylic acid in water/AOT/isooctane reverse micelles

机译：双限制对7-（二乙基氨基）香豆素-3-羧酸在水/ AOT /异辛烷反转胶束中的光学药物的影响

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The effect of double confinement on the photophysics of 7-(diethylamino)coumarin-3-carboxylic acid (7-DCCA) inside the water pool of water/AOT/isooctane reverse micelles has been reported in this study. At first a supramolecular host–guest complex was formed in water between 2-hydroxypropyl-γ-cyclodextrin (HP-γ-CD) and 7-DCCA. Then the aqueous solution of this complex was used to form reverse micelles at any particular w _(0) value ( w _(0) = [water]/[surfactant]). We have used sodium dioctyl sulfosuccinate (AOT) as surfactant and isooctane as non-polar solvent to prepare reverse micelles. A comparative study between double confinement system and the single confinement system, where the 7-DCCA molecule was incorporated inside the core of the water/AOT/isooctane reverse micelles, was done. We have used the steady state absorption and fluorescence emission techniques to highlight the significant shift of the spectral behaviour of the 7-DCCA due to the double encapsulation of the dye in the nanopool of the reverse micelles. More affirmation has been achieved by the use of time resolved fluorescence emission spectroscopy. The study of solvation dynamics and rotational relaxation dynamics was used as tools to investigate the effect of double encapsulation on the excited state dynamics of the probe molecule. These excited state dynamics clearly show that even at the highest w _(0) value studied here, the excited state dynamics of the doubly confined dye are significantly different from those of the single confined dye in the reverse micelle. The higher values of fluorescence emission decay time, rotational relaxation and solvent relaxation times in the doubly confined system compared to those of the single confined system at different w _(0) values proved the existence of the supramolecular host–guest complex inside the core of the water/AOT/isooctane reverse micelle.
机译：本研究报道，在水/ AOT / IsoOctane反转胶束水池内7-（二乙基氨基）香豆素-3-羧酸（7-DCCA）的光学药物的双重限制的影响已经报道。首先，在2-羟丙基-γ-环糊精（HP-γ-CD）和7-DCCA之间的水中形成超分子宿主 - 客销络合物。然后使用该配合物的水溶液在任何特定W _（0）值（W _（0）= [水] / [表面活性剂]处形成反向胶束。我们使用二辛基磺酸钠（AOT）作为表面活性剂和异辛烷作为非极性溶剂以制备反胶束。双重限制系统与单次限制系统的比较研究，其中7-DCCA分子掺入水/ AOOOCE庚烷反向胶束的核心内。我们使用稳态吸收和荧光发射技术来突出显示7-DCCA的光谱行为的显着变化，由于反转胶束的纳米池中的染料双重封装。通过使用时间分辨荧光发射光谱学，已经实现了更多肯定。溶剂化动力学和旋转松弛动力学的研究用作研究双包封对探针分子激发状态动态的影响。这些激发状态动态清楚地表明，即使在此处研究的最高W _（0）值，则双孔染料的激发状态动态与反向胶束中的单个密闭染料的激发状态动态显着不同。与不同W _（0）值的单个狭窄系统相比，在双限制系统中较高的荧光发射衰减时间，旋转弛豫和溶剂弛豫时间的值证明了核心内的超分子宿主复合物的存在水/ AOT / ISOODANE反向胶束。

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