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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Spectral Heterogeneity of PRODAN Fluorescence in Isotropic Solvents Revealed by Multivariate Photokinetic Analysis
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Spectral Heterogeneity of PRODAN Fluorescence in Isotropic Solvents Revealed by Multivariate Photokinetic Analysis

机译：多元光动力学分析揭示各向同性溶剂中PRODAN荧光的光谱异质性

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摘要

This paper describes a multivariate analysis of the fluorescence emission of 6-propionyl-2-dimethylaminonaphthalene (PRODAN) in a series of isotropic solvents of differing polarity and hydrogen-bonding ability. Multivariate methods distill the essential features from spectral data matrices so that the structural details that are embedded within the data are revealed to the analyst. In the aprotic solvents investigated, the analysis reveals a pair of emission components that have emission maxima that scale with the orientational polarizability. In the alcohols, short-lived, polarity-independent blue bands tentatively attributed to neutral hydrogen-bonded solute-solvent complexes form and relax prior to emission from paired bands that have Stokes shifts that scale with the solvent hydrogen-bonding ability rather than the polarity. In water, the short-lived blue bands were not observed, but the shift in the paired bands did scale with the solvent hydrogen-bonding ability.
机译：本文描述了在一系列具有不同极性和氢键结合能力的各向同性溶剂中6-丙酰基-2-二甲基氨基萘（PRODAN）荧光发射的多变量分析。多元方法从光谱数据矩阵中提取了基本特征，以便将嵌入数据中的结构细节透露给分析人员。在所研究的非质子传递溶剂中，分析揭示了一对发射成分，这些成分的发射最大值与取向极化率成比例。在醇中，暂时归因于中性氢键溶质-溶剂配合物的短寿命，与极性无关的蓝带形成并松弛，然后从具有斯托克斯位移的成对带中释放出来，斯托克斯位移随溶剂氢键的能力而不是极性。在水中，未观察到短暂的蓝带，但成对带的移动确实与溶剂氢键能力成比例。

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