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Synthesis and study of CuII complex with nitroxide, a jumping crystal analog. / Sagdeev, R. Z.; Tolstikov, S. E.; Fokin, S. V. et al.

In: Russian Chemical Bulletin, Vol. 66, No. 2, 01.02.2017, p. 222-230.

Research output: Contribution to journal › Article › peer-review

Harvard

Sagdeev, RZ, Tolstikov, SE, Fokin, SV, Obsharova, IV, Tumanov, SV, Veber, SL, Romanenko, GV, Bogomyakov, AS, Fedin, MV, Tretyakov, EV, Halcrow, M & Ovcharenko, VI 2017, 'Synthesis and study of CuII complex with nitroxide, a jumping crystal analog', Russian Chemical Bulletin, vol. 66, no. 2, pp. 222-230. https://doi.org/10.1007/s11172-017-1722-y

APA

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. (2017). Synthesis and study of CuII complex with nitroxide, a jumping crystal analog. Russian Chemical Bulletin, 66(2), 222-230. https://doi.org/10.1007/s11172-017-1722-y

Vancouver

Sagdeev RZ, Tolstikov SE, Fokin SV, Obsharova IV, Tumanov SV, Veber SL et al. Synthesis and study of CuII complex with nitroxide, a jumping crystal analog. Russian Chemical Bulletin. 2017 Feb 1;66(2):222-230. doi: 10.1007/s11172-017-1722-y

Author

Sagdeev, R. Z. ; Tolstikov, S. E. ; Fokin, S. V. et al. / Synthesis and study of CuII complex with nitroxide, a jumping crystal analog. In: Russian Chemical Bulletin. 2017 ; Vol. 66, No. 2. pp. 222-230.

BibTeX

@article{4a3447a66a8e458d8a9194a348b43c8c,
title = "Synthesis and study of CuII complex with nitroxide, a jumping crystal analog",
abstract = "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 {\AA} 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.",
keywords = "Cu, magnetic properties, nitroxide radicals, X-ray diffraction, SUBSTITUTED NITRONYL NITROXIDE, SPIN TRANSITIONS, EPR, INTERCLUSTER EXCHANGE, Cu2+, ELECTRON-PARAMAGNETIC-RESONANCE, MOLECULAR MAGNETS, TRIADS, CLUSTER",
author = "Sagdeev, {R. Z.} and Tolstikov, {S. E.} and Fokin, {S. V.} and Obsharova, {I. V.} and Tumanov, {S. V.} and Veber, {S. L.} and Romanenko, {G. V.} and Bogomyakov, {A. S.} and Fedin, {M. V.} and Tretyakov, {E. V.} and M. Halcrow and Ovcharenko, {V. I.}",
year = "2017",
month = feb,
day = "1",
doi = "10.1007/s11172-017-1722-y",
language = "English",
volume = "66",
pages = "222--230",
journal = "Russian Chemical Bulletin",
issn = "1066-5285",
publisher = "Springer Nature",
number = "2",

}

RIS

TY - JOUR

T1 - Synthesis and study of CuII complex with nitroxide, a jumping crystal analog

AU - Sagdeev, R. Z.

AU - Tolstikov, S. E.

AU - Fokin, S. V.

AU - Obsharova, I. V.

AU - Tumanov, S. V.

AU - Veber, S. L.

AU - Romanenko, G. V.

AU - Bogomyakov, A. S.

AU - Fedin, M. V.

AU - Tretyakov, E. V.

AU - Halcrow, M.

AU - Ovcharenko, V. I.

PY - 2017/2/1

Y1 - 2017/2/1

N2 - 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.

AB - 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.

KW - Cu

KW - magnetic properties

KW - nitroxide radicals

KW - X-ray diffraction

KW - SUBSTITUTED NITRONYL NITROXIDE

KW - SPIN TRANSITIONS

KW - EPR

KW - INTERCLUSTER EXCHANGE

KW - Cu2+

KW - ELECTRON-PARAMAGNETIC-RESONANCE

KW - MOLECULAR MAGNETS

KW - TRIADS

KW - CLUSTER

UR - http://www.scopus.com/inward/record.url?scp=85021830367&partnerID=8YFLogxK

U2 - 10.1007/s11172-017-1722-y

DO - 10.1007/s11172-017-1722-y

M3 - Article

AN - SCOPUS:85021830367

VL - 66

SP - 222

EP - 230

JO - Russian Chemical Bulletin

JF - Russian Chemical Bulletin

SN - 1066-5285

IS - 2

ER -

ID: 10095821