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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photochemistry and Photophysics of 1-Azaxanthone in Organic Solvents
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Photochemistry and Photophysics of 1-Azaxanthone in Organic Solvents

机译：1-氮杂蒽酮在有机溶剂中的光化学和光物理

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摘要

The photochemical and photophysical properties of 1-azaxanthone have been studied to determine its usefulness as a probe for polarity, reactivity, and/or radical pair dynamics in supramolecular systems. Contrary to the behavior of xanthone, a structurally related ketone, the triplet-triplet absorption spectrum of 1-azaxanthone does not present polarity-induced shifts in its maximum despite its n,π~* character. Self-quenching is a remarkably fast process that occurs at nearly diffusion-controlled rates. Nevertheless, the reactivity of 1-azaxanthone toward hydrogen atom abstraction in polar media is by far superior compared to the reactivities of other aromatic ketones. This property results from the unaltered n,π~* triplet character as a consequence of the presence of a pyridine ring and makes it a convenient probe for the study of radical pair reactions and guest/host interactions in highly polar microheterogeneous systems.
机译：已经研究了1-氮杂蒽酮的光化学和光物理性质，以确定其用作超分子系统中极性，反应性和/或自由基对动力学的探针的有用性。与结构上相关的酮黄酮的行为相反，1-氮杂蒽酮的三重态-三重态三重吸收光谱尽管表现出n，π〜*特征，但并未表现出极性引起的最大位移。自猝灭是一个非常快的过程，几乎以扩散控制的速率发生。然而，与其他芳族酮的反应性相比，1-氮杂蒽酮在极性介质中对氢原子提取的反应性要好得多。该性质归因于吡啶环的存在而未改变的n，π〜*三重态特征，使其成为研究高极性微非均相系统中自由基对反应和客体/主体相互作用的便捷探针。

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