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Crown ether styryl dyes .17. Influence of the length of the N-substituent in betaines of chromogenic 15-crown-5-ethers on complexation with cations of alkaline-earth metalsстатья
Информация о цитировании статьи получена из
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Stanislavskii O.B., Ushakov E.N., Gromov S.P., Fedorova O.A., Alfimov M.V.
- Журнал: Russian Chemical Bulletin
- Том: 45
- Номер: 3
- Год издания: 1996
- Издательство: Springer Nature
- Местоположение издательства: Switzerland
- Первая страница: 564
- Последняя страница: 572
- DOI: 10.1007/BF01435783
- Аннотация: The stoichiometry of complexation of crown ether styryl dyes with Mg2+, Ca2+, and Ba2+ ions and the dependence of the stability constants of these complexes on the length of the N-sulfoalkyl substituent were investigated. Introduction of a terminal sulfo group into the N-ethyl substituent had but a small effect on the stability constant for the complexes with 1:1 stoichiometry. Increase in the length of the N-substituent by one or two methylene groups resulted in a jumpwise rise of this constant. The effect observed was attributed to the formation of the intramolecular ion pair, The dimerization constant for Mg2+ complexes increased dramatically when passing from the sulfopropyl N-substituent to the sulfobutyl. one. The increase in the constant results from the decrease in steric strains in the dimeric complex.
- Добавил в систему: Громов Сергей Пантелеймонович