非极性 Aprotic 溶剂中极性探针随温度变化的旋转动力学：溶剂粘度和尺寸效应的相互作用。

IF 2.6 4区化学 Q2 BIOCHEMICAL RESEARCH METHODS

Journal of Fluorescence Pub Date : 2024-10-01 DOI:10.1007/s10895-024-03973-6

Anil Kumar, C G Renuka

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引用次数: 0

摘要

利用稳态和荧光去极化技术，研究了 3-(苯并[d]噻唑-2-基)-7-(二乙基氨基)-2 H-色烯-2-酮（3BT7D2H-one）探针在非极性的 1,4-二氧六环、甲苯和环己烷溶剂中的旋转动力学，这些溶剂的粘度不同且相当。实验重新定向时间与流体力学斯托克-爱因斯坦-德拜（SED）进行了比较。在 1,4 二氧六环中，由于溶剂粘度的原因，实验测得的旋转重新定向时间较长。在环己烷中，随着温度的变化，溶质旋转动力学行为显示了从亚滑移到 SED 滑动边界条件的过渡。溶剂粘度、溶质大小和分子形状的微妙变化对极性探针在非极性非质子溶剂中的旋转动力学起着重要作用。

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Temperature-Dependent Rotational Dynamics of a Polar Probe in Non-Polar Aprotic Solvents: Interplay of Solvent Viscosity and Size Effect.

Rotational dynamics of 3-(benzo[d]thiazol-2-yl)-7-(diethylamino)-2 H-chromen-2-one (3BT7D2H-one) probe in non-polar aprotic 1,4 dioxane, toluene and cyclohexane solvents of different and comparable viscosity are studied with varying temperature using steady-state and fluorescence depolarization technique. The experimental reorientation time is compared with the hydrodynamic Stoke's-Einstein-Debye(SED). The experimentally measured rotational reorientation times are higher in 1,4 dioxane attributed to its solvent viscosity. In cyclohexane, the solute rotational dynamics behavior shows a transition from sub-slip to SED slip boundary conditions with varying temperatures. Solvent viscosity, size, and subtle changes in the molecular shape of solute play an important role in the rotational dynamics of polar probes in non-polar aprotic solvents.

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来源期刊

Journal of Fluorescence 化学-分析化学

CiteScore

4.60

自引率

7.40%

发文量

203

审稿时长

5.4 months

期刊介绍： Journal of Fluorescence is an international forum for the publication of peer-reviewed original articles that advance the practice of this established spectroscopic technique. Topics covered include advances in theory/and or data analysis, studies of the photophysics of aromatic molecules, solvent, and environmental effects, development of stationary or time-resolved measurements, advances in fluorescence microscopy, imaging, photobleaching/recovery measurements, and/or phosphorescence for studies of cell biology, chemical biology and the advanced uses of fluorescence in flow cytometry/analysis, immunology, high throughput screening/drug discovery, DNA sequencing/arrays, genomics and proteomics. Typical applications might include studies of macromolecular dynamics and conformation, intracellular chemistry, and gene expression. The journal also publishes papers that describe the synthesis and characterization of new fluorophores, particularly those displaying unique sensitivities and/or optical properties. In addition to original articles, the Journal also publishes reviews, rapid communications, short communications, letters to the editor, topical news articles, and technical and design notes.