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Изучение кислотно-основных свойств и структурных параметров тиобарбитуровой кислоты А. П. Лакеев, Э. Р. Сайфулин

By: Лакеев, Александр ПавловичContributor(s): Сайфулин, Эдуард РияловичMaterial type: ArticleArticleOther title: Examination of acid-base properties and structural parameters of thiobarbituric acid [Parallel title]Subject(s): экспериментальные данные | квантово-химические расчеты | кислотно-основные равновесия | лиганды | тиобарбитуровая кислотаGenre/Form: статьи в сборниках Online resources: Click here to access online In: Перспективы развития фундаментальных наук. Т. 2 : сборник научных трудов XV Международной конференции студентов, аспирантов и молодых ученых, 24–27 апреля 2018 г Т. 2 : Химия. С. 168-170Abstract: The stepwise proton-ligand stability constant of thiobarbituric acid anion was determined in an aqueous solution via pH-potentiometry at ionic strength I = 0,1 and temperature T = 20°C. Based on the absorption spectra analysis of thiobarbituric acid (H2L, H2thioBar) solutions in the UV-region at different pH values, it was shown that H2thioBar could exist in di-, mono-, and deprotonated forms. This latter fact is reflected in the particle yield H2L diagrams as a function of the aqueous solution pH. Besides, some geometric and physico-chemical characteristics ofH2thioBar were described by means of quantum chemical calculations.
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The stepwise proton-ligand stability constant of thiobarbituric acid anion was determined in an aqueous solution via pH-potentiometry at ionic strength I = 0,1 and temperature T = 20°C. Based on the absorption spectra analysis of thiobarbituric acid (H2L, H2thioBar) solutions in the UV-region at different pH values, it was shown that H2thioBar could exist in di-, mono-, and deprotonated forms. This latter fact is reflected in the particle yield H2L diagrams as a function of the aqueous solution pH. Besides, some geometric and physico-chemical characteristics ofH2thioBar were described by means of quantum chemical calculations.

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