An approach to fluorinated phthalonitriles containing a nitronyl nitroxide or iminonitroxide moiety

Pavel Fedyushin, Elena Panteleeva, Irina Bagryanskaya, Kseniya Maryunina, Katsuya Inoue, Dmitri Stass, Evgeny Tretyakov

Результат исследования: Научные публикации в периодических изданияхстатья

1 Цитирования (Scopus)

Аннотация

A 4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl lithium derivative was found to react with perfluorophthalonitrile with formation of 2-(3,4-dicyano-2,5,6-trifluorophenyl)- (1) and 2-(2-amino-4,5-dicyano-3,6-difluorophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-3-oxide-1-oxyl (2). The yields of 1 were near 15% independently of reaction time (from 2 to 6 h), whereas the yields of 2 considerably increased from a trace amount to 20%. Both nitronyl nitroxides were reduced to the corresponding iminonitroxides in the presence of NaNO2/AcOH with yields 80–95%. Molecular and crystal structures of the obtained nitroxides were solved by monocrystal X-ray diffraction analysis, and the nature of the radical was ascertained by electron spin spectroscopy (ESR) and SQUID magnetometry. Static magnetochemical measurements of 1 revealed domination of the ferromagnetic exchange interactions between the odd electrons of the paramagnetic centres. The exchange interactions probably proceed via short intermolecular contacts (3.021(3) and 3.05(2) Å) between the nitroxide O atoms and cyanide C atoms. Structural characteristics of the prepared nitroxides make them valuable precursors for the synthesis of paramagnetic macrocycles, which may serve as building blocks in the field of molecular magnetism.

Язык оригиналаанглийский
Страницы (с-по)1-7
Число страниц7
ЖурналJournal of Fluorine Chemistry
Том217
DOI
СостояниеОпубликовано - 1 янв 2019

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