Отправить статью по E-mail Synthesis and study of CuII complex with nitroxide, a jumping crystal analog
- Авторы: Sagdeev R.1,2, Tolstikov S.1, Fokin S.1, Obsharova I.1, Tumanov S.1,3, Veber S.1,3, Romanenko G.1, Bogomyakov A.1, Fedin M.1,3, Tretyakov E.4, Halcrow M.5, Ovcharenko V.1
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Учреждения:
- International Tomography Center, Siberian Branch of the Russian Academy of Sciences
- Kazan (Volga Region) Federal University
- Novosibirsk State University
- N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences
- University of Leeds
- Выпуск: Том 66, № 2 (2017)
- Страницы: 222-230
- Раздел: Full Articles
- URL: https://journals.rcsi.science/1066-5285/article/view/239964
- DOI: https://doi.org/10.1007/s11172-017-1722-y
- ID: 239964
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Аннотация
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.
Об авторах
R. Sagdeev
International Tomography Center, Siberian Branch of the Russian Academy of Sciences; Kazan (Volga Region) Federal University
Email: tse@tomo.nsc.ru
Россия, 3a ul. Institutskaya, Novosibirsk, 630090; 18 ul. Kremlevskaya, Kazan, 420008
S. Tolstikov
International Tomography Center, Siberian Branch of the Russian Academy of Sciences
Автор, ответственный за переписку.
Email: tse@tomo.nsc.ru
Россия, 3a ul. Institutskaya, Novosibirsk, 630090
S. Fokin
International Tomography Center, Siberian Branch of the Russian Academy of Sciences
Email: tse@tomo.nsc.ru
Россия, 3a ul. Institutskaya, Novosibirsk, 630090
I. Obsharova
International Tomography Center, Siberian Branch of the Russian Academy of Sciences
Email: tse@tomo.nsc.ru
Россия, 3a ul. Institutskaya, Novosibirsk, 630090
S. Tumanov
International Tomography Center, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University
Email: tse@tomo.nsc.ru
Россия, 3a ul. Institutskaya, Novosibirsk, 630090; 2 ul. Pirogova, Novosibirsk, 630090
S. Veber
International Tomography Center, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University
Email: tse@tomo.nsc.ru
Россия, 3a ul. Institutskaya, Novosibirsk, 630090; 2 ul. Pirogova, Novosibirsk, 630090
G. Romanenko
International Tomography Center, Siberian Branch of the Russian Academy of Sciences
Email: tse@tomo.nsc.ru
Россия, 3a ul. Institutskaya, Novosibirsk, 630090
A. Bogomyakov
International Tomography Center, Siberian Branch of the Russian Academy of Sciences
Email: tse@tomo.nsc.ru
Россия, 3a ul. Institutskaya, Novosibirsk, 630090
M. Fedin
International Tomography Center, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University
Email: tse@tomo.nsc.ru
Россия, 3a ul. Institutskaya, Novosibirsk, 630090; 2 ul. Pirogova, Novosibirsk, 630090
E. Tretyakov
N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences
Email: tse@tomo.nsc.ru
Россия, 9 prosp. Akad. Lavrent´eva, Novosibirsk, 630090
M. Halcrow
University of Leeds
Email: tse@tomo.nsc.ru
Великобритания, Leeds, LS2 9JT
V. Ovcharenko
International Tomography Center, Siberian Branch of the Russian Academy of Sciences
Email: tse@tomo.nsc.ru
Россия, 3a ul. Institutskaya, Novosibirsk, 630090
