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Complete Solvation Dynamics of Coumarin 153 in Tetraalkylammonium Bromide-Based Deep Eutectic Solvents
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2020-03-17 , DOI: 10.1021/acs.jpcb.0c00594 Sk Saddam Hossain 1 , Sneha Paul 1 , Anunay Samanta 1
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2020-03-17 , DOI: 10.1021/acs.jpcb.0c00594 Sk Saddam Hossain 1 , Sneha Paul 1 , Anunay Samanta 1
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Deep eutectic solvents (DESs) are novel environment-friendly media for a variety of applications. In order to obtain insight into the structure and dynamics of some less-explored DESs comprising ethylene glycol and tetraalkylammonium bromide salts with variable alkyl chain length, we have captured complete dynamics occurring in these solvents in a timescale of few femtoseconds to several nanoseconds by monitoring the time-dependent fluorescence Stokes shift of coumarin 153 employing a combination of time-correlated single-photon counting and fluorescence upconversion techniques. The solvent response function constructed from the measured data reveals a sub-picosecond component (∼0.8 ps, 20–35%) in addition to a slow component (180–475 ps) with a distribution of relaxation time. The slow time component is found to be strongly dependent on the viscosity of the medium, indicating that it arises from the diffusive motions of the solvent constituents into and out of the solvation shell, whereas the ultrafast time component, which is nearly independent of the solvent viscosity, arises from fast local motions of the constituents in the immediate vicinity of the solute molecule.
中文翻译：
香豆素153在四烷基溴化铵基深共熔溶剂中的完全溶剂化动力学
深共熔溶剂（DES）是适用于各种应用的新型环保介质。为了深入了解某些未开发的包含乙二醇和可变烷基链长的DES和乙二醇和四烷基溴化铵盐的DES的结构和动力学，我们通过监测这些化合物在几飞秒到几纳秒的时间范围内捕获了发生在这些溶剂中的完整动力学。时间相关的荧光香豆素153的斯托克斯位移，采用了时间相关的单光子计数和荧光上转换技术的组合。根据测量数据构建的溶剂响应函数显示，除了具有松弛时间分布的缓慢分量（180-475 ps）之外，还具有亚皮秒分量（约0.8 ps，20-35％）。
更新日期：2020-03-19
中文翻译：
香豆素153在四烷基溴化铵基深共熔溶剂中的完全溶剂化动力学
深共熔溶剂（DES）是适用于各种应用的新型环保介质。为了深入了解某些未开发的包含乙二醇和可变烷基链长的DES和乙二醇和四烷基溴化铵盐的DES的结构和动力学，我们通过监测这些化合物在几飞秒到几纳秒的时间范围内捕获了发生在这些溶剂中的完整动力学。时间相关的荧光香豆素153的斯托克斯位移，采用了时间相关的单光子计数和荧光上转换技术的组合。根据测量数据构建的溶剂响应函数显示，除了具有松弛时间分布的缓慢分量（180-475 ps）之外，还具有亚皮秒分量（约0.8 ps，20-35％）。
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