Г 44 Гетероспиновые комплексы на основе биядерного трикетоната Cu(II) и нитроксильных радикалов [] = Heterospin complexes based on dinuclear Cu(II) triketonate and nitroxides / В. И. Овчаренко, С. В. Фокин, Г. В. Романенко, В. Н. Икорский, Р. З. Сагдеев, Д. С. Ячевский, Д. Л. Чижов, В. Н. Чарушин // Изв. АН. Сер. Химическая. - 2006. - № 11 . - С. 1836 - 1840 : рис., табл. - Библиогр. : с. 1840 (15 назв.) Рубрики: ХИМИЧЕСКИЕ НАУКИ |
S 61 Simultaneous transformation of a polynuclear complex and nitroxide in the reaction of the {Co6(O)2Piv10} cluster with 2,4,4,5,5-pentamethyl-4,5-dihydro-1H-imidazolyl-(3-oxide)-1-oxyl [Electronic resource] / E. Fursova, O. A. Kuznetsova, V. Ovcharenko, G. V. Romanenko, V. Ikorskii, I. L. Eremenko, A. A. Sidorov // Polyhedron. - 2007. - Vol. 26, № 9-11. - P2079-2088 Рубрики: ХИМИЧЕСКИЕ НАУКИ \\\\Expert2\\nbo\\Polyhedron\\2007. v.26. p.2079.pdf |
S 10 S-N(H) approach in the synthesis of nitronyl nitroxides [Text] / O. N. Chupakhin, I. A. Utepova, M. V. Varaksin, E. V. Tretyakov, G. V. Romanenko, V. Ovcharenko, D. V. Stass // Journal of Organic Chemistry. - 2009. - Vol. 74, № 7. - P2870-2872 Рубрики: ХИМИЧЕСКИЕ НАУКИ \\\\Expert2\\nbo\\Journal of Organic Chemistry\\2009, v.74, p.2870.pdf |
H 62 Heterospin complexes based on dinuclear CuII triketonate and nitroxides [Electronic resource] / V. Ovcharenko, S. V. Fokin, G. V. Romanenko, V. Ikorskii, R. S. Sagdeev, D. S. Yachevskii, D. L. Chizhov, V. N. Charushin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2006. - Vol. 55, № 11. - P1904-1908 Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: Heterospin complexes of bis(?2-1,1,2,2,8,8,9,9-octafluorononane-3,5,7-trionato)dicopper(II) ([Cu2L2]) with nitronyl nitroxides 2-(1-methyl-1H-pyrazol-4-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-1-oxyl 3-oxide (2) and 4,4,5,5-tetramethyl-2-(3-pyridinyl)-4,5-dihydro-1H-imidazole-1-oxyl 3-oxide (1) were synthesized and structurally characterized. Crystals of the complexes are formed by the discrete bis[1-methyl-4-(4,4,5,5-tetramethyl-3-oxide-1-oxyl-4,5-dihydro-1H-imidazol-2-yl)-1H-pyrazole]-bis (?2-1,1,2,2,8,8,9,9-octafluorononane-3,5,7-trionato)dicopper(II) etherate (3) and bis[3-(4,4,5,5-tetramethyl-3-oxide-1-oxyl-4,5-dihydro-1H-imidazol-2-yl)pyridine]-bis (?2-1,1,2,2,8,8,9,9-octafluorononane-3,5,7-trionato)dicopper(II) (4) molecules. Each Cu atom of the dinuclear chelate fragment coordinates one paramagnetic ligand through the N atom of the pyrazole or pyridine fragment, respectively. In complex 3, the paramagnetic ligands are located on one side of the plane of the chelate fragment, whereas the ligands in complex 4 are located above and below the plane of the chelate fragment. The magnetic properties of complexes 3 and 4 are determined by dominant antiferromagnetic exchange interactions between the unpaired electrons of the CuII atoms in the dinuclear Cu2L2 moiety \\\\Expert2\\nbo\\Russian Chemical Bulletin\\2006, 55 (11), 1904.pdf |
S 10 S- N(H) Reaction of lithiated nitronyl nitroxide with quinoline N-oxide [Electronic resource] / V. Ovcharenko, O. N. Chupakhin, I. S. Kovalev, E. V. Tretyakov, G. V. Romanenko // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2008. - Vol. 57, № 10. - P2227-2229 Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: The SNH reaction of lithiated 4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-1-oxyl 3-oxide with quinoline N-oxide affords 4,4,5,5-tetramethyl-2-(1-oxidoquinolin-2-yl)-4,5-dihydro-1H-imidazole-1-oxyl 3-oxide \\\\Expert2\\nbo\\Russian Chemical Bulletin\\2008, 57 (10), 2227-2229.pdf |
H 62 Heterospin complexes of fluorinated dinuclear Cu(II) and Mn(II) triketonates with nitroxides [Electronic resource] / V. Ovcharenko, S. V. Fokin, G. V. Romanenko, A. S. Bogomyakov, D. S. Yachevskii, D. L. Chizhov, V. N. Charushin, O. N. Chupakhin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2010. - Vol. 59, № 6. - P1162-1174 : il. - Bibliogr. : p. 1174 (21 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): COPPER(II) -- MANGANESE(II) -- METAL TRIKETONATES -- NITROXIDES -- x-RAY DIFFRACTION STUDY -- MAGNETIC PROPERTIES Аннотация: Dinuclear heterospin complexes of CuII and MnII 1,1,1,7,7,7-hexafluoroheptane-2,4,6-trionates ([Cu2L2] and [Mn2L2], respectively) with nitronyl nitroxides 2-R-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide 1-oxyls (NIT-R, R = H, Me, Et, m-C5H4N, m-NCC6H4, p-NCC6H4, PzMe) and the diradical NIT-Pz-(CH2)4-Pz-NIT (Pz is 1,4-pyrazolylene) were synthesized and structurally characterized. In the complexes under study, the CuII atom tends to have the square-pyramidal coordination environment, and the MnII atom is in an octahedral environment. The magnetochemical investigation of the compounds in the temperature range of 2–300 K showed that the antiferromagnetic exchange coupling dominates in the [Cu2L2] molecules, whereas this coupling in [Mn2L2] is manifested in the experimental plot µeff(T) at T < 100 K. The magnetic properties of the heterospin complexes of [Cu2L2] with NIT-R are also determined by the intramatrix antiferromagnetic exchange coupling. For the complexes of [Mn2L2] with NIT-R, the coordination mode of the nitroxide plays a decisive role. \\\\Expert2\\nbo\\Russian Chemical Bulletin\\2010, 59 (6), 1162-1174.pdf |
F 42 Ferro- and antiferromagnetic interactions in polymeric and molecular complexes of Cu(hfac)2 with 1-oxoazin-2-yl-substituted nitronyl nitroxides [Text] / O. N. Chupakhin, E. V. Tretyakov, I. A. Utepova, M. V. Varaksin, G. V. Romanenko, A. S. Bogomyakov, S. L. Veber, V. Ovcharenko // Polyhedron. - 2011. - Vol. 30, № 4. - P647-653. - Bibliogr. : p. 653 (9 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: Solid heterospin compounds based on Cu(hfac)2 complexes with a new group of nitronyl nitroxides bearing different azine-N-oxide substituents at position 2 of the 2-imidazoline ring (Ln) were studied. The major factor responsible for the change in the magnetic characteristics of the [Cu(hfac)2L1] complex with triazine nitronyl nitroxide with temperature was shown to be the specific pairwise packing of heterospin molecules with the dominant antiferromagnetic exchange between the radical fragments of adjacent molecules. For complexes of Cu(hfac)2 with 1-oxoazin-2-yl-substituted nitronyl nitroxides L2 and L4, 7-membered metallocycles were obtained, although they form rarely. It was shown that polymer chains formed in the solid complex with spin-labeled pyrazine-N-oxide [(Cu(hfac)2)3(L3)2] due to the cross-linking of {(Cu(hfac)2)2(L3)2} binuclear fragments via the bridging [Cu(hfac)2].???? \\\\Expert2\\nbo\\Polyhedron\\2011. v.30. p.647.pdf |
N 52 New approach to synthesis of nitronyl and imino nitroxides based on S(N)(H) methodology [Text] / E. V. Tretyakov, I. A. Utepova, M. V. Varaksin, S. E. Tolstikov, G. V. Romanenko, A. S. Bogomyakov, D. V. Stass, V. Ovcharenko, O. N. Chupakhin // ARKIVOC. - 2011. - Part 8. - P76-98 : ил. - Bibliogr. : p. 98 (36 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: It is shown that S(N)(H) approach opens new possibilities in the synthesis of polyfunctional nitronyl and imino nitroxides. It is found that the interaction of 4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-3-oxide-1-oxyl lithium salt Li1 with 3,6-diaryl-1,2,4-triazines leads to formation of the corresponding triazines bearing nitronyl nitroxide or imino nitroxide substituent at position 5 of the heterocycle. The reaction of Li1 with pyridazine-N-oxide gives rise to nitroxide with buten-3-ynyl substituent 5. Spin-labeled 5 could be readily transformed by the use of 1,3-dipolar and nucleophilic addition reactions, as well as oxidative coupling, that gives a large group of new paramagnets: 2-(1H-pyrazol-5-yl)vinyl-, 2-ethynylcyclopropyl-, 2-(3-(ethoxycarbonyl) isoxazol-5-yl)vinyl-, 1-(pyrrolidin-1-yl)but-3-ynyl-substituted nitronyl nitroxide and a diradical -2,2'-((1E,7E)-octa-1,7-dien-3,5-diyne-1,8-diyl)bis(4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-3-oxide-1-oxyl). The new nitroxides were characterized by X-ray single crystal data, ESR and static magnetic susceptibility measurements |
B 62 Bis(1,1,1,3,5,5,5-heptafluoro-4-iminopent-2-ene-2-aminato)copper(ii) — a new metal-containing matrix in the design of heterospin systems [Electronic resource] / S. V. Fokin, V. Ovcharenko, G. V. Romanenko, E. V. Tretyakov, A. S. Bogomyakov, V. I. Saloutin, T. I. Filyakova, L. V. Saloutina, V. N. Charushin, O. N. Chupakhin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2011. - Vol.60, №5. - С. 816-823. - Bibliogr. : p. 823 (11 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): COPPER(II) -- BISCHELATES -- NITROXIDES Аннотация: The first heterospin compounds based on bis(1,1,1,3,5,5,5 heptafluoro 4 iminopent 2 ene 2 aminato)copper(II) (CuL2) and nitronyl nitroxide radicals, 2 R 4,4,5,5 tetramethyl 4,5 dihydro 1H imidazole 3 oxide 1 oxyls (NIT R, where R = H, Me, Ph, and 1 methyl pyrazol 4 yl), were synthesized and structurally characterized. An important peculiarity of the structure of synthesized solid phases is the formation of a supramolecular structure due to hydrogen bonds between the oxygen atoms of the nitronyl nitroxide fragments of NIT R and the hydrogen atoms of the NH groups of CuL2 \\\\expert2\\NBO\\Russian Chemical Bulletin\\2011, 60 (5), 816-823.pdf |