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Crown-containing butadienyl dyes 8. Structures and complexation of chromogenic dithia-15(18)-crown-5(6) ethersстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Ushakov E.N., Kuz'mina L.G., Vedernikov A.I., Kapichnikova M.S., Howard J.A.K, Worner M., Braun A.M., Alfimov M.V., Gromov S.P.
- Журнал: Russian Chemical Bulletin
- Том: 55
- Номер: 1
- Год издания: 2006
- Издательство: Springer Nature
- Местоположение издательства: Switzerland
- Первая страница: 94
- Последняя страница: 100
- DOI: 10.1007/s11172-006-0220-4
- Аннотация: The structures of new butadienyl dyes of the benzothiazole series containing the dithia-15-crown-5 (2a) or dithia-18-crown-6 (2b) fragments were established by X-ray diffraction. Complexation of dyes 2a,b with Hg2+, Pb2+, Cd2+, Ag+, Zn2+, and alkaline-earth cations in aqueous-acetonitrile solutions was studied by spectrophotometry. At a high percentage of water in solutions (P-w approximate to 50%), these dyes have a very low ability to bind Pb2+ cations (log K < 2) and virtually do not bind Cd2+, Zn2+, and alkaline-earth cations. At the same time, these dyes form stable 1 : 1 complexes with Hg2+ and Ag+ cations at all Pw. The stability constants of complexes with the Ag+ cation increase with increasing P-w because the free energy of hydration of this cation is much lower than the free energy of solvation in acetonitrile. In the Pw range from 0 to 75%, the stability constants of the complexes of dyes 2a,b with the Hg2+ cation are larger than those of the corresponding complexes with the Ag+ cation by more than four orders of magnitude.
- Добавил в систему: Громов Сергей Пантелеймонович