Spectral and Luminescent Properties of Bis(hydroxyazomethine)s of Angular Structure

IF 0.9 4区化学 Q4 CHEMISTRY, PHYSICAL High Energy Chemistry Pub Date : 2024-04-21 DOI:10.1134/s0018143924020061

I. R. Mardaleishvili, A. S. Tatikolov, L. S. Kol’tsova, O. N. Krutius, A. I. Shienok, N. L. Zaichenko

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Abstract

The spectral and luminescent properties of solutions of bis(hydroxyphenylazomethine)s (I and II) and bis(hydroxynaphthylazomethine)s (III and IV) of the benzene and pyridine series in toluene and ethanol have been studied. The keto–enol equilibrium in pyridine azomethine II in the ground state weakly depends on the presence of the pyridine N atom, whereas the influence of pyridine is significant for pyridine azomethine IV. In solutions of I and II in both solvents, two luminescence bands are observed from the enol (E*) and (K*) keto forms, the ratio of which depends on the excitation wavelength. Luminescence in solutions of III and IV is determined by the formation of K*, and predominant short-wavelength luminescence from E* is added to the luminescence spectrum only in a solution of III in toluene in the case of short-wavelength excitation. The solvent and the pyridine atom were found to affect the position of the emission bands, with the influence being more pronounced for compound II than for IV. For all compounds I–IV, luminescence in alcohol is an order of magnitude more intense than in toluene.

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角结构双（羟基氮杂环丁烷）的光谱和发光特性

摘要研究了苯系列和吡啶系列的双（羟基苯基偶氮甲烷）（I 和 II）和双（羟基萘基偶氮甲烷）（III 和 IV）在甲苯和乙醇中溶液的光谱和发光特性。吡啶偶氮甲烷 II 在基态时的酮烯醇平衡微弱地依赖于吡啶 N 原子的存在，而吡啶对吡啶偶氮甲烷 IV 的影响则很大。在 I 和 II 在两种溶剂中的溶液中，可以观察到来自烯醇（E*）和（K*）酮形式的两条发光带，其比例取决于激发波长。III 和 IV 溶液中的发光是由 K* 的形成决定的，只有在 III 的甲苯溶液中，在短波长激发的情况下，E* 的主要短波长发光才会加入到发光光谱中。溶剂和吡啶原子会影响发射带的位置，对化合物 II 的影响比对化合物 IV 更明显。对于所有化合物 I-IV，在酒精中的发光强度比在甲苯中的高一个数量级。

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来源期刊

High Energy Chemistry 化学-物理化学

CiteScore

1.50

自引率

28.60%

发文量

审稿时长

6-12 weeks

期刊介绍： High Energy Chemistry publishes original articles, reviews, and short communications on molecular and supramolecular photochemistry, photobiology, radiation chemistry, plasma chemistry, chemistry of nanosized systems, chemistry of new atoms, processes and materials for optical information systems and other areas of high energy chemistry. It publishes theoretical and experimental studies in all areas of high energy chemistry, such as the interaction of high-energy particles with matter, the nature and reactivity of short-lived species induced by the action of particle and electromagnetic radiation or hot atoms on substances in their gaseous and condensed states, and chemical processes initiated in organic and inorganic systems by high-energy radiation.