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首页> 外文期刊>RSC Advances >Modulated photophysics and rotational-relaxation dynamics of coumarin 153 in nonionic micelles: the role of headgroup size and tail length of the surfactants
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Modulated photophysics and rotational-relaxation dynamics of coumarin 153 in nonionic micelles: the role of headgroup size and tail length of the surfactants

机译：非离子胶束中香豆素153的光物理调控和旋转松弛动力学：表面活性剂的头基大小和尾长的作用

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摘要

Here, the effect of variation in the headgroup size and the alkyl tail length of nonionic surfactants on the photophysics and rotational-relaxation dynamics of the laser dye coumarin 153 (C153) has been explored. The variation in the headgroup size, that is, poly(ethylene oxide) (PEO) chain length of the nonionic micellar systems, has been implemented using a variety of surfactants belonging to Triton X family, whereas surfactants from the Tween family provides an access to the variation of the tail length (alkyl chain) of the surfactants. Our spectroscopic study reveals a remarkable influence on the photophysics of C153 upon binding with the micelles. The strength of the dye-micelle binding interaction is found to be largely controlled by the variation of the headgroup size and the length of the tail of the surfactants. To this end, the dye-micelle binding interaction has been quantitatively assayed from emission studies and carefully interpreted based on the micellar hydration model. The estimation of the micropolarity of the dye binding site is further employed to corroborate this argument. Furthermore, all these line of arguments are effectively substantiated from time-resolved fluorescence experiments with particular emphasis on the modulation of rotational dynamics of the dye within the micellar micro-heterogeneous environments.
机译：在此，已经探索了非离子表面活性剂的头基大小和烷基尾长的变化对激光染料香豆素153（C153）的光物理和旋转松弛动力学的影响。使用多种Triton X系列表面活性剂实现了头基大小的变化，即非离子胶束系统的聚环氧乙烷（PEO）链长的变化，而Tween系列的表面活性剂则提供了表面活性剂的尾长（烷基链）的变化。我们的光谱研究表明，与胶束结合后，对C153的光物理性质产生了显着影响。发现染料-胶束结合相互作用的强度在很大程度上受表面活性剂的头基尺寸和尾部长度的变化控制。为此，已经从发射研究中定量分析了染料-胶束的结合相互作用，并根据胶束水合模型对其进行了仔细的解释。染料结合位点的微极性的估计被进一步证实这一观点。此外，所有这些论点都可以从时间分辨荧光实验中得到有效证实，特别是在胶束微非均质环境中染料旋转动力学的调节。

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