Hysteresis of Corrole Fluorescence in Acid–Base Equilibria

IF 0.8 4区 化学 Q4 SPECTROSCOPY
A. Yu. Shakel, A. M. Sokhibova, D. V. Petrova, M. M. Kruk
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引用次数: 0

Abstract

The effect of sequential formation of protonated and deprotonated forms of 2,3,7,13,17,18-hexamethyl-8,12-di-n-butylcorrole in solution on their photophysical characteristics and spectral-luminescent properties was studied. The spectral characteristics of each of the two forms in the ground electronic state were found to be the same when they formed from the free base and from the antipodal form, while the fluorescence spectra of the two forms differed depending on the method of formation. Based on an analysis of spectral shifts in fluorescence spectra and fluorescence quantum yields, it was concluded that the protonated and deprotonated forms of corroles underwent specific interactions in the lower excited singlet S1 state due to the formation of a complex solvation shell. These specific interactions were shown to lead to hysteresis of the fluorescence characteristics of the protonated and deprotonated forms of corroles with their mutual transitions caused by (cyclic) changes in the acid–base equilibrium.

酸碱平衡中科罗尔荧光的滞后性
研究了 2,3,7,13,17,18-hexamethyl-8,12-di-n-butylcorrole 在溶液中依次形成质子化和去质子化形式对其光物理性质和光谱发光特性的影响。研究发现,当这两种形式分别由游离基和对偶形式形成时,它们在基态电子状态下的光谱特性是相同的,而这两种形式的荧光光谱则因形成方法的不同而不同。根据对荧光光谱中的光谱偏移和荧光量子产率的分析,得出的结论是质子化和去质子化形式的 corroles 由于形成了复杂的溶胶壳而在低激发单色 S1 状态下发生了特殊的相互作用。研究表明,这些特殊的相互作用导致质子化和去质子化形式的珊瑚虫的荧光特性出现滞后,它们之间的相互转变是由酸碱平衡的(周期性)变化引起的。
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来源期刊
CiteScore
1.30
自引率
14.30%
发文量
145
审稿时长
2.5 months
期刊介绍: Journal of Applied Spectroscopy reports on many key applications of spectroscopy in chemistry, physics, metallurgy, and biology. An increasing number of papers focus on the theory of lasers, as well as the tremendous potential for the practical applications of lasers in numerous fields and industries.
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