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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Dynamics of 4-benzylamino-7-nitrobenzofurazan in the 1-propanol/water binary solvent system. Evidence for composition-dependent solvent organization
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Dynamics of 4-benzylamino-7-nitrobenzofurazan in the 1-propanol/water binary solvent system. Evidence for composition-dependent solvent organization

机译:4-苄氨基-7-硝基苯并呋喃在1-丙醇/水二元溶剂系统中的动力学依赖成分的溶剂组织的证据

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摘要

We report on the fluorescence lifetime and rotational diffusion dynamics of 4-benzylamino-7-nitrobenzofurazan (BBD) in a series of 1-propanol/water binary solvent systems. The fluorescence lifetime of BBD increases monotonically with increasing 1-propanol concentration. The rotational diffusion dynamics of BBD also vary with solution 1-propanol content, but this variation is not monotonic. Comparison of the BBD rotational diffusion time constant to solution viscosity and 1-propanol composition reveals the presence of a solution composition dependence of solvent-solute interactions, with a relative decrease in solvent-solute interaction strength for solvent system compositions where the 1-propanol/water azeotrope is known to exist. These data point collectively to the existence of microscopic heterogeneity in these binary solvent systems.
机译:我们报告了一系列1-丙醇/水二元溶剂系统中4-苄基氨基-7-硝基苯并呋喃(BBD)的荧光寿命和旋转扩散动力学。 BBD的荧光寿命随着1-丙醇浓度的增加而单调增加。 BBD的旋转扩散动力学也随溶液1-丙醇含量的变化而变化,但这种变化不是单调的。 BBD旋转扩散时间常数与溶液粘度和1-丙醇组成的比较表明,溶液组成对溶剂-溶质相互作用的依赖性较高,而对于溶剂体系组合物,其中1-丙醇/已知存在水共沸物。这些数据共同指向这些二元溶剂系统中存在微观异质性。

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