Реферат: We synthesized 1-ethylimidazolyl-substituted nitronyl nitroxides, i.e., 2-(1-ethylimidazol-4-yl)- (L4Et) and 2-(1-ethylimidazol-5-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole 3-oxide-1-oxyl (L5Et). The stable radical L5Et is an ethyl analog of 2-(1-methylimidazol-5-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole 3-oxide-1-oxyl (L5Me) described earlier, the reaction of which with Cu(hfac)2 (hfac is 1,1,1,5,5,5-hexafluoropentane-2,4-dionate) leads to the formation of the [Cu(hfac)2(L5Me)2] jumping crystals. The reaction of Cu(hfac)2 with L5Et with reagent ratios 1: 2 and 1: 1 yields heterospin complexes [Cu(hfac)2(L5Et)2] and [Cu(hfac)2L5Et]2, respectively. X-ray diffraction study of the mononuclear complex [Cu(hfac)2(L5Et)2] determined that the compound has a packing similar to that of jumping crystals studied earlier, with the only difference being that the O...O contacts between neigh- boring nitroxide groups were found to be 0.3—0.5 Å longer than in [Cu(hfac)2(L5Me)2]. As a result of the lengthening of these contacts, [Cu(hfac)2(L5Et)2] crystals lack chemomechanical activi- ty. We found that when cooling crystals of binuclear complex [Cu(hfac)2L5Et]2 below 50 K, the antiferromagnetic exchange between unpaired electrons of the >N—•O groups of neighboring molecules leads to the full spin-pairing of the nitroxides, with only the Cu2+ ions contributing to the residual paramagnetism of the compound.

Библиографическая ссылка: Sagdeev R.Z. , Tolstikov S.E. , Fokin S.V. , Obsharova I.V. , Tumanov S.V. , Veber S.L. , Romanenko G.V. , Bogomyakov A.S. , Fedin M.V. , Tretyakov E.V. , Halcrow M. , Ovcharenko V.I.
Synthesis and study of Cu^II complex with nitroxide, a jumping crystal analog
Russian Chemical Bulletin. 2017. V.66. N2. P.222-230. DOI: 10.1007/s11172-017-1722-y WOS Scopus

Идентификаторы БД:

Web of science:	WOS:000405088100004
Scopus:	2-s2.0-85021830367

Цитирование в БД:

БД	Цитирований
Scopus	7
Web of science	7

Альметрики: