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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Rey, Paul Maurel, Vincent Grand, André Peresypkina, Eugenia V. Vostrikova, Kira E. Fedin, Vladimir P. |
| Description | Author Affiliation: Peresypkina EV ( Institution Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Lavrentiev avenue, Novosibirsk 630090, Russia.) |
| Abstract | 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⋅HCl led to 1:1 inclusion complex [1⋅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 $(J=+2.3 cm^{−1},$ $H=−2 JS_{1}S_{2})$ and a triplet ground spin state for the inclusion complex. |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 41 |
| Volume Number | 16 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2010-11-02 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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