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Inclusion of a Nitronyl Nitroxyl Radical and Its Hydrochloride in Cucurbit[8]urilстатья
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: 17 декабря 2015 г.
- Авторы: Peresypkina Eugenia V., Fedin Vladimir P., Maurel Vincent, Grand Andre, Rey Paul, Vostrikova Kira E.
- Журнал: Chemistry - A European Journal
- Том: 16
- Номер: 41
- Год издания: 2010
- Издательство: John Wiley & Sons Ltd.
- Местоположение издательства: United Kingdom
- Первая страница: 12481
- Последняя страница: 12487
- DOI: 10.1002/chem.201001194
- Аннотация: The recognition properties of cucurbit[8] uril (CB8) toward nitronyl nitroxide 2-(2-benzimidazolyl)-4,4,5,5-tetramethylimidazolidinyl- 3-oxide-1-oxy (1) and its hydrochloride have been investigated. 1 center dot HCl led to 1: 1 inclusion complex [1 center dot HCl@CB8], which was characterized both in solution and by single-crystal X-ray diffraction. In this compound only the tetramethylimidazolidinyl fragment is included in the host. The magnetic behavior of the complex corresponds to a Curie law with a large separation of the spin carriers in the solid. In contrast, an insoluble species exhibiting ferromagnetic behavior is formed when pure 1 reacts with acid-free CB8. The formula [(1)(2)@(CB8)(3)], in which two radical guests are arranged in such a way that the phenyl groups of the benzimidazolyl substituents are both stacked into one CB8 and the tetramethyl fragments are each capped by a terminal macrocycle, is proposed, in agreement with microanalysis, spectrophotometric, EPR, and magnetic measurements. According to McConnell's rules, the alternating spin densities within the stacked aromatic fragments result in a ferromagnetic interaction (J(-) + 2.3 cm(-1), H = -2JS(1)S(2)) and a triplet ground spin state for the inclusion complex.
- Добавил в систему: Vostrikova Kira E.