Assembly of Imidazolyl-Substituted Nitronyl Nitroxides into Ferromagnetically Coupled Chains / V. Romanov [et al.]
Уровень набора: CrystalsЯзык: английский.Страна: .Резюме или реферат: New nitronyl nitroxides, namely, 2-(4,5-dimethylimidazol-2-yl)- and2-(4,5-dichloroimidazol-2-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-3-oxide-1-oxyl, were prepared in crystalline form. According to single-crystal X-ray data, intra- and intermolecular hydrogen bonds are formed between NH groups of the imidazole cycles and O atoms of the nitroxide moieties. The intermolecular H-bonds contribute to the alignment of molecules into chains along the a-axis; this alignment causes short intrachain contacts between O and C atoms carrying spin density of opposite signs. Such an arrangement of nitroxides induces ferromagnetic intrachain interactions (J 10 cm-1) between neighboring radicals..Примечания о наличии в документе библиографии/указателя: [References: 35 tit.].Тематика: труды учёных ТПУ | электронный ресурс | nitronyl nitroxides | imidazole | crystal structure | hydrogen bonding | exchange interaction | density functional theory | имидазол | водородная связь | обменное взаимодействие Ресурсы он-лайн:Щелкните здесь для доступа в онлайнTitle screen
[References: 35 tit.]
New nitronyl nitroxides, namely, 2-(4,5-dimethylimidazol-2-yl)- and2-(4,5-dichloroimidazol-2-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-3-oxide-1-oxyl, were prepared in crystalline form. According to single-crystal X-ray data, intra- and intermolecular hydrogen bonds are formed between NH groups of the imidazole cycles and O atoms of the nitroxide moieties. The intermolecular H-bonds contribute to the alignment of molecules into chains along the a-axis; this alignment causes short intrachain contacts between O and C atoms carrying spin density of opposite signs. Such an arrangement of nitroxides induces ferromagnetic intrachain interactions (J 10 cm-1) between neighboring radicals.
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