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Preferential solvation and bimolecular quenching reactions of boronic acid dye at very low quencher concentrations studied by fluorescence spectrum in toluene and butanol binary mixtures
Indian Journal of Pure & Applied Physics ( IF 0.7 ) Pub Date : 2020-03-20
P Bhavya, Raveendra Melavanki, Raviraj Kusanur, J Thipperudrappa

Inferable from the significance of solvent mixtures in practical chemistry, toluene (TL) and butanol (BL) mixtures are used to studyfluorescence behavior of boronic acid dye 2-methoxy-5-fluoro-phenyl boronic acid (2MEFPBA). At the inception, preferential solvation is examined in TL-BL, to understand specific and nonspecific interactions. Suppan’s dielectric enrichment model is further used to understand the nonideality and dielectric enrichment in TL-BL mixtures for preferential solvation. Bimolecular quenching reaction studies of 2MEFPBA with aniline as quencher are made in mixtures of TL–BLto know the effect of viscosity and dielectric constant variation at room temperature.
The quenching process is studied in all solvent mixtures by steady state and transient state method. Quenching is characterized by S-V plots having upward curvature. Analysis of modified S-V equations which accounts both static and dynamic quenching allows calculating bimolecular quenching rate constant. The bimolecular quenching reactions are found to be significantly larger. Further finite sink approximation model is invoked so as to check whether reactions are diffusion limited. The extents of these rate parameters demonstrate that positive deviations in the Stern-Volmer (S-V) plot are because of the presence of apparent static and dynamic quenching process.


中文翻译:

通过荧光光谱研究甲苯和丁醇二元混合物中硼酸染料在极低淬灭剂浓度下的优先溶剂化和双分子淬灭反应

从溶剂混合物在实际化学中的重要性可以推断出,甲苯(TL)和丁醇(BL)混合物用于研究硼酸染料2-甲氧基-5-氟-苯基硼酸(2MEFPBA)的荧光行为。从一开始,就在TL-BL中检查优先溶剂化,以了解特定的和非特定的相互作用。Suppan的介电富集模型进一步用于了解TL-BL混合物中非理想和介电富集的优先溶剂化。在TL-BL的混合物中进行了以苯胺为猝灭剂的2MEFPBA的双分子猝灭反应研究,以了解室温下粘度和介电常数变化的影响。
通过稳态和瞬态方法研究了所有溶剂混合物的淬火过程。淬火的特征是SV曲线具有向上的曲率。分析考虑了静态和动态猝灭的改进的SV方程,可以计算出双分子猝灭速率常数。发现双分子淬灭反应明显更大。调用进一步的有限沉近似模型,以检查反应是否受扩散限制。这些速率参数的范围表明,Stern-Volmer(SV)图中的正偏差是由于存在明显的静态和动态淬火过程。
更新日期:2020-03-20
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