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41.
S. V. Fokin S. E. Tolstikov E. V. Tretyakov G. V. Romanenko A. S. Bogomyakov S. L. Veber R. Z. Sagdeev V. I. Ovcharenko 《Russian Chemical Bulletin》2011,60(12):2470-2484
First isoxazolyl-substituted nitronyl nitroxides (L and $L^{Me_2 }$ ) were synthesized and characterized. Their reactions with Cu(hfac)2 and Mn(hfac)2 (hfac is hexafluoroacetylacetonate) afford the heterospin complexes [Cu(hfac)2L] n , [Cu2(hfac)4L] n , $\left[ {Cu_2 (hfac)_4 L^{Me_2 } } \right]_n$ , $\left[ {Cu(hfac)_2 L^{Me_2 } } \right]_n$ , $\left[ {Cu(hfac)_2 L^{Me_2 } _2 } \right]$ , $\left[ {Cu(hfac)_2 L^{Me_2 } (MeCN)} \right]$ , [Mn(hfac)2]3L4, and $\left[ {Me(hfac)_2 L^{Me_2 } } \right]_2$ . In the ligand L, the N atom of the isoxazole ring (NIz) has weak electron-donating properties. For example, the paramagnetic ligand in the chain polymer complex [Cu(hfac)2L] n acts as a bidentate bridging ligand coordinated through both O atoms of the nitronyl nitroxide group (ON-O); the NIz and OIz atoms are not involved in the coordination. The introduction of Me groups into the isoxazole substituent results in an increase in the electron density on the NIz atom and enables the synthesis of the chain polymer complex $\left[ {Cu(hfac)_2 L^{Me_2 } } \right]_n$ , in which the bidentate bridging ligand $L^{Me_2 }$ is coordinated through the ON-O and NIz atoms. In the mononuclear complexes $\left[ {Cu(hfac)_2 L^{Me_2 } _2 } \right]$ and $\left[ {Cu(hfac)_2 L^{Me_2 } (MeCN)} \right]$ , the paramagnetic ligand is coordinated only through the NIz atom. The solid heterospin Mn complexes [Mn(hfac)2]3L4 and $\left[ {Mn(hfac)_2 L^{Me_2 } } \right]_2$ have a molecular structure. In these complexes, strong antiferromagnetic intracluster exchange interactions arise. The residual magnetic moments of the exchange clusters in the complex [Mn(hfac)2]3L4 are ferromagnetically coupled, resulting in the increase in the effective magnetic moment (??eff) of the complex with decreasing temperature in the range of 300??30 K. The thermomagnetic study of the complexes [Cu(hfac)2L] n , [Cu2(hfac)4L] n , and $\left[ {Cu_2 (hfac)_4 L^{Me_2 } } \right]_n$ in the range of 2?C300 K revealed the ferromagnetic ordering at temperatures below 5 K. The ESR study of the solid complex $\left[ {Cu(hfac)_2 L^{Me_2 } } \right]_n$ showed that the decrease in its ??eff in the temperature range of 30?C300 K is associated with the direct exchange interaction between the unpaired electrons of the nitronyl nitroxides of adjacent chains, whereas at temperatures below 30 K, only Cu2+ ions contribute to the magnetic susceptibility of the complex. 相似文献
42.
A. V. Piskunov A. V. Maleeva G. A. Abakumov V. K. Cherkasov G. K. Fukin A. S. Bogomyakov 《Russian Journal of Coordination Chemistry》2011,37(4):243-256
Zinc and cadmium bis-o-semuquinolate and catecholate complexes are synthesized by the reduction of 3,6-di-tert-butyl-o-benzoquinone (3,6-Q) with amalgamated metals in a medium of various solvents. The oxidation of the metal catecholate derivatives results in the corresponding mono-o-semiquinone complexes, which undergo symmetrization to form the metal bis-o-semiquinolates. The molecular structures of the complexes (3,6-SQ)2Zn · Py, (3,6-SQ)2Zn · H2O, and (3,6-SQ)2Cd · α,α′-Bipy (3,6-SQ is the radical anion of 3,6-Q) are studied by X-ray diffraction analysis. Magnetochemical studies are carried out for the zinc and cadmium bis-o-semiquinone complexes. 相似文献
43.
Andrey Zadesenets Evgeny Filatov Pavel Plyusnin Iraida BaidinaVasiliy Dalezky Yuri Shubin Sergey Korenev Artyom Bogomyakov 《Polyhedron》2011,30(7):1305-1312
All the steps of the proposed technique, from the synthesis of single-source precursors to the preparation of CoPd and CoPt nanoalloys, are described. The double complex salts (DCS) [M(NH3)4][Co(C2O4)2(H2O)2]·2H2O (M = Pd, Pt), which were synthesized by mixing solutions containing [M(NH3)4]2+ cations and [Co(C2O4)2(H2O)2]2− anions, have been used as precursors. The salts obtained were characterized by IR spectroscopy, thermal analysis, XRD and single crystal X-ray diffraction. The prepared compounds crystallize in the monoclinic (space group I2/m, M = Pd) and orthorhombic (space group I222, M = Pt) crystal systems. Thermal decomposition of the salts in helium or hydrogen atmosphere at 200-600 °C results in the formation of nanoalloys powders (random solid solution Co0.50Pd0.50 and chemically ordered CoPt). The size of the bimetallic particles varied from 5 to 20 nm. Order-disorder structural transformations in Co0.50Pt0.50 nanoalloys were studied. The magnetic properties of both chemically disordered Co0.50Pd0.50 and ordered CoPt clusters have also been measured. 相似文献
44.
Piskunov AV Maleeva AV Fukin GK Baranov EV Bogomyakov AS Cherkasov VK Abakumov GA 《Dalton transactions (Cambridge, England : 2003)》2011,40(3):718-725
The interaction of 3,6-di-tert-butyl-o-benzoquinone (3,6-Q) with indium in toluene leads to the tris-o-semiquinolate derivative (3,6-SQ)(3)In (3,6-SQ - radical-anion of 3,6-Q). According to single-crystal X-ray diffraction analysis, this complex has a trigonal prismatic structure. Magnetic measurements revealed that the exchange interactions between odd electrons of the paramagnetic ligands in (3,6-SQ)(3)In are antiferromagnetic in character. The treatment of (3,6-SQ)(3)In with 2,2'-dipyridyl (Dipy) causes the displacement of one o-quinone ligand and the formation of the (3,6-SQ)In(Dipy)(3,6-Cat) (3,6-Cat - dianion of 3,6-Q) derivative containing mixed charged o-quinoid ligands. The reaction of InI with (3,6-SQ)K in THF solution is accompanied by a redox process and the potassium-indium(iii) catecholate derivative was obtained as a result. The oxidation of InI with 3,6-Q in THF produces the dimeric In(iii) iodo-catecholate complex [(3,6-Cat)(2)In·2THF]InI(2). The same derivative can be synthesized by the interaction of indium metal with a mixture of I(2) and 3,6-Q. 相似文献
45.
Irina Fomina Zhanna Dobrokhotova Grygory Aleksandrov Anna Emelina Mikhail Bykov Irina Malkerova Artem Bogomyakov Lada Puntus Vladimir Novotortsev Igor Eremenko 《Journal of solid state chemistry》2012
The new 1D coordination polymer {Tm(Piv)3}n (1), where Piv=OOCBut?, was synthesized in high yield (>95%) by the reaction of thulium acetate with pivalic acid in air at 100 °С. According to the X-ray diffraction data, the metal atoms in compound 1 are in an octahedral ligand environment unusual for lanthanides. The magnetic and luminescence properties of polymer 1, it’s the solid-phase thermal decomposition in air and under argon, and the thermal behavior in the temperature range of ?50…+50 °С were investigated. The vaporization process of complex 1 was studied by the Knudsen effusion method combined with mass-spectrometric analysis of the gas-phase composition in the temperature range of 570–680 K. 相似文献
46.
E. P. Ivakhnenko Yu. V. Koshchienko P. A. Knyazev K. A. Lysenko A. S. Bogomyakov V. I. Minkin 《Russian Journal of Coordination Chemistry》2016,42(8):509-515
The complex formation between redox active 2,4,6,8-tetrakis(tert-butyl)phenoxazin-1-one (L) and four-coordinate Co(II) complexes, resulting in six-coordinate adducts (I) (C77H82N12O5Co) and (II) (C38H41NO6F12Co) was studied. High-spin structure of the formed cobalt adducts I and II (hs-CoII–BQ) was established by X-ray diffraction analysis and magnetochemistry methods. Adducts I and II are stable over a wide temperature range (5–300 K) and are not involved in the redox process giving low-spin adducts (ls-CoIII–SQ) studied previously. 相似文献
47.
O. V. Kuznetsova E. Yu. Fursova V. I. Ovcharenko G. V. Romanenko A. S. Bogomyakov 《Russian Chemical Bulletin》2008,57(10):2198-2200
A dodecanuclear complex [Ni12Piv10(hfac)6(OH)8(EtOH)6]·C6H14 was isolated from various synthetic systems simultaneously containing NiII and the pivalate and hexafluoro-acetylacetonate anions. The structure of this complex was determined and the magnetic properties
were investigated. The use of EtOH as the solvent or the presence of EtOH in the reagents is the decisive factor for the formation
of this complex. 相似文献
48.
Yu. A. Bryleva L. A. Glinskaya K. S. Marenin A. S. Bogomyakov D. A. Piryazev A. V. Tkachev S. V. Larionov 《Russian Journal of Coordination Chemistry》2018,44(2):117-126
Complexes [CuL1Cl2] (I), [CuL2Cl2] · EtOH (II), and Cu2L3Cl4 (III) containing esters of the N-derivatives of optically active amino acids based on (+)-3-carene (L1, L2) and (?)-α-pinene (L3) are synthesized. The crystal and molecular structures of compounds I and II are determined by X-ray diffraction analyses (CIF files CCDC nos. 1560071 (I), 1560072 (II)). The crystal structure of compound I consists of mononuclear complex molecules. In the structure of compound II, the unit cell contains two crystallographically independent molecules of mononuclear complex [CuL2Cl2] and two EtOH molecules. Ligands L1 and L2 perform the tridentate-chelating function by the N atoms of the NH and NOH groups and by the O atom of the C=O group. In compounds I and II, the coordination polyhedra Cl2N2O of the Cu atoms are trigonal bipyramid. According to the data of IR and electronic spectroscopy, binuclear complex III has similar coordination polyhedra. The experimental values of μeff for compounds I, II, and III at 300 K are 1.93, 1.88, and 2.71 μB. For complex III, the μeff(T) dependence in a range of 2–300 K indicates a weak ferromagnetic exchange interaction. 相似文献
49.
M. N. Sokolov A. V. Rogachev A. V. Virovets A. S. Bogomyakov 《Journal of Structural Chemistry》2018,59(1):126-130
Single crystals of Tl2[NbCl6] (1) and Tl2 [NbBr6] (2) are obtained as black needles on heating TlCl, Nb, S2Cl2 (1) and Tl, Nb, and Br2 at 400°C (2). Tl2NbBr6 also forms in the reaction of TlBr, Nb, Br2, and S at 500°C. Both compounds crystallize in the K2[PtCl6] structure type to form non-distorted octahedral [NbХ6]2– anions (Nb–Cl 2.397(4) Å and Nb–Br 2.516(2) Å). The magnetic properties of Tl2[NbBr6] in a range 5-300 K indicate an antiferromagnetic interaction between Nb4+ ion spins (d1, S = 1/2). On cooling, the compound becomes a noncollinear ferromagnet with Tc = 23 K. 相似文献
50.
E. Yu. Fursova V. I. Ovcharenko A. S. Bogomyakov G. V. Romanenko 《Journal of Structural Chemistry》2013,54(1):164-167
The structure of the [Mn6(O)2(Piv)10L2]∞ compound, where Piv is the pivalate anion and L is isonicotinamide, is investigated. Its solid phase is found to be formed by polymeric layers within which hexanuclear fragments {Mn6(O)2(Piv)10} are bound by bidentate bridging L. The molecules of the solvent (Me2CO or EtOAc) in which the synthesis was performed are incorporated into the inter-layer space of the crystal. 相似文献