溶解变色、氢键诱导电荷转移以及 pH 值对氧化亚甲基脲电子吸收光谱的影响

IF 0.8 4区化学 Q4 SPECTROSCOPY

Journal of Applied Spectroscopy Pub Date : 2024-11-19 DOI:10.1007/s10812-024-01824-7

Sokaina Saad Hemdan, Mamdouh S. Masoud, Rehab M. I. Elsamra

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引用次数: 0

摘要

溶剂效应研究用于描述与介质极性变化相关的紫外-可见吸收带位置的明显变化。脲基化合物在质子和非质子溶剂中的紫外可见吸收带位置不同。各种溶剂参数，如介电常数、折射率、Kamlet-Taft 和 Catalán 参数，都被用来评估溶剂与溶剂之间的相互作用以及所研究指示剂紫外可见吸收最大值的溶解变色偏移。解释了同分异构现象。研究发现，Kamlet-Taft 溶剂标度最适合描述 Murexide 的溶解变色行为。所研究化合物的解离常数 pKa 和等离点表明，在不同的 pH 值范围内存在着不同的主要离子种类。

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Solvatochromism, Hydrogen Bonding Induced Charge Transfer, and Influence of pH on Electronic Absorption Spectra of Murexide

A study of the solvent effect was used to describe the pronounced change in position of the UV-Visible absorption band associated with changing the polarity of the medium. Murexide compound which has different position of UV-Visible absorption band in the protic and nonprotic solvents. Various solvent parameters, such as dielectric constant, refractive index, Kamlet–Taft and Catalán parameters were used for the evaluation of the solute–solvent interactions and the solvatochromic shifts of the UV-Vis absorption maximum of the investigated indicator. The phenomenon of tautomerism is explained. The Kamlet–Taft solvent scale was found to be the most appropriate to describe the solvatochromic behavior of the Murexide. The dissociation constant pK_a and the isosbestic point of the investigated compound showed the presence of the individual predominate ionic species in different pH ranges.

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来源期刊

Journal of Applied Spectroscopy SPECTROSCOPY-

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.