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Controlled self-assembly of bis(crown)stilbenes into unusual bis-sandwich complexes: structure and stereoselective [2+2] photocycloadditionстатья
Статья опубликована в высокорейтинговом журнале
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: Gromov S.P., Vedernikov A.I., Lobova N.A., Kuz'mina L.G., Basok S.S., Strelenko Y.A., Alfimov M.V., Howard J.A.K
- Журнал: New Journal of Chemistry
- Том: 35
- Номер: 3
- Год издания: 2011
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- Первая страница: 724
- Последняя страница: 737
- DOI: 10.1039/c0nj00780c
- Аннотация: It was shown by H-1 NMR spectroscopy that symmetrical bis(crown)stilbenes (L) and small alkali and alkaline-earth metal cations form 1(L) : 1(Mm+) and 1(L) : 2(Mm+) complexes in MeCN solutions. In the case of large or hydrated metal cations such as Cs+, Rb+, K+, Ba2+, Sr2+, [Ca(H2O)(x)](2+) and stilbenes with a small crown-ether cavity as compared with the metal cation size, stable bis-sandwich complexes 2(L) : 2(Mm+) can also be formed. A stable bis-pseudosandwich 2 : 2 complex is also produced from bis(18-crown-6) stilbene with the propanediammonium ion. The effect of the crown-ether size and the cation size and nature on the route of stilbene phototransformation and product composition was elucidated. The bis-(pseudo)sandwich complexes undergo effective stereoselective [2+2] photocycloaddition giving mainly rctt isomers of new 1,2,3,4-tetracrown cyclobutanes. The structures of complexes of bis(crown)stilbenes and obtained cyclobutanes were confirmed by X-ray diffraction.
- Добавил в систему: Громов Сергей Пантелеймонович