Acid-base properties of solvatochromic pyridinium-N-phenolate betaine dyes in pure and mixed solvents
The protonation constants of a set of solvatochromic pyridinium-N-phenolate betaine dyes I–XI (D±) were determined in methanol, water, and the ternary solvent mixture benzene – ethanol – water (with mass ratio 47:47:6) using the vis spectroscopic method. Both, medium effects on transferring from wat...
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Видавець: | Інститут загальної та неорганічної хімії ім. В.І. Вернадського НАН України |
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Дата: | 2007 |
Автори: | , , , , , , |
Формат: | Стаття |
Мова: | English |
Опубліковано: |
Інститут загальної та неорганічної хімії ім. В.І. Вернадського НАН України
2007
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Назва видання: | Украинский химический журнал |
Теми: | |
Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/185856 |
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Цитувати: | Acid-base properties of solvatochromic pyridinium-N-phenolate betaine dyes in pure and mixed solvents / N.O. Mchedlov-Petrossyan, Yu.V. Isaenko, S.T. Goga, L.N. Vilkova, V.I. Borodenko, S.V. Shekhovtsov, C. Reichardt // Украинский химический журнал. — 2007. — Т. 73, № 10. — С. 114-119. — Бібліогр.: 10 назв. — англ. |
Репозиторії
Digital Library of Periodicals of National Academy of Sciences of UkraineРезюме: | The protonation constants of a set of solvatochromic pyridinium-N-phenolate betaine dyes I–XI (D±) were determined in methanol, water, and the ternary solvent mixture benzene – ethanol – water (with mass ratio 47:47:6) using the vis spectroscopic method. Both, medium effects on transferring from water to organic solvents and salt effects in aqueous media are in agreement with the zwitterionic nature of the betaines, which possess a high dipole moment in the electronic ground state. The character of solvation of dyes D± in the ternary solvent mixture is discussed basing on the position of the charge–transfer (CT) absorption band in the visible region. The association of the betaine dyes with metal ions (Na⁺, Mg²⁺, La³⁺) in 1-butanol manifests itself in a disappearance of the long-wavelength CT band as result of a complex formation with the cationic Lewis acids. |
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