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1.
Koval'chukova O. V. Kuz'mina N. E. Strashnova S. B. Palkina K. K. Mordovina N. I. Zaitsev B. E. Nikitin S. V. 《Russian Journal of Coordination Chemistry》2003,29(2):123-128
Complexes of scandium, yttrium, and lanthanum nitrates with 3-chloro-9-hydroxy-2,4-dimethylpyrido[1,2-a]pyrimidinium perchlorate (HL1ClO4) and 9-hydroxy-2,4-dimethylpyrido[1,2-a]pyrimidinium perchlorate (HL2ClO4) were obtained. Their composition was formulated as Sc(LClO4)2(NO3) and M(LClO4)2(NO3)2 (L = L1 or L2; M = Y or La); structures for the complexes obtained were proposed. The crystal and molecular structure of HL1ClO4 was determined. Dissociation and complexation of HL1ClO4 and HL2ClO4 in aqueous ethanol were studied using the spectroscopic method. Ligand dissociation and complexation constants were calculated. It was shown that a chlorine-containing organic ligand only slightly changes the composition and stability of the metal complexes. 相似文献
2.
O. V. Kovalchukova O. A. Tsegel’nik P. V. Strashnov B. E. Zaitsev S. B. Strashnova O. V. Volyanski K. E. Kobrakov 《Russian Journal of Inorganic Chemistry》2010,55(5):709-713
Six copper(II), iron(III), and chromium(III) complexes with 5,10-dioxo-4,5,9,10-tetrahydro-4,9-diazapyrene derivatives (H2L1-H2L3) have been synthesized and studied by physical methods (IR and electronic absorption spectroscopy, quantum-chemical calculations).
The composition of the complexes has been determined and their stability constants in aqueous dimethylformamide solutions
have been calculated. The energy characteristics, electronic structure and geometry of isolated diazapyrenes and their tautomeric
forms have been calculated by the PM6 method, and their complexes have been modeled. 相似文献
3.
O. V. Kovalchukova A. I. Stash S. B. Strashnova E. P. Romashkina B. E. Za?tsev 《Crystallography Reports》2010,55(3):428-431
The complex compounds (H3
L · Cl)[CoCl4] (I) and H2
L[CuBr4] (II), where L is 2,4,6-tri(N,N-dimethylamino)methylphenol, were isolated in the crystalline state and studied by X-ray diffraction. The organic cations
were found to be outer-sphere ligands. All three nitrogen atoms of the tertiary amino groups are protonated. In compound I, the H3
L
3+ cation exists as the cis tautomer. In compound II, the H2
L
2+ dication exists as the trans isomer. In the crystal structure, the dications are arranged in layers via hydrogen bonds. 相似文献
4.
A. V. Bulatov U. M. Strashnova A. B. Vishnikin G. M. Alekseeva T. D. Sineva A. L. Moskvin L. N. Moskvin 《Journal of Analytical Chemistry》2011,66(3):275-279
A procedure is developed for the photometric determination of ascorbic acid in drug preparations. It is based on the rapid
and highly selective reaction of ascorbic acid with a novel reagent, the guanidinium salt of 1-bismuto-11-molybdophosphoric
heteropolyacid. The detection limit for ascorbic acid in stepwise injection analysis makes 15 mg/L, and the duration of single
analysis, 5 min. 相似文献
5.
Kovalchukova O. V. Stash A. I. Strashnova S. B. Polyanskaya N. A. 《Crystallography Reports》2020,65(1):48-52
Crystallography Reports - N-(Phenyl)-2-benzoylethylamine (I), N-(4-chlorophenyl)-2-benzoylethylamine (II), and N-(2-chlorophenyl)-2-benzoylethylamine hydrazone (III) were synthesized in the... 相似文献
6.
N. E. Kuz’mina O. V. Koval’chukova S. B. Strashnova K. K. Palkina B. E. Zaitsev N. Yu. Isaeva 《Crystallography Reports》2004,49(5):758-766
Ammonium 2,3,5,6-tetraoxo-4-nitropyridinate was shown to exist as stable dimers and act as a weak electrolyte in both a crystalline state and aqueous solutions. In a strongly alkaline medium, ammonium cations were successively replaced by sodium cations. The molecular and crystal structures of sodium 2,3,5,6-tetraoxo-4-nitropyridinate trihydrate and sodium ammonium bis(2,3,5,6-tetraoxo-4-nitropyridinate) monohydrate were established, and their spectroscopic characteristics were determined. 相似文献
7.
S. B. Strashnova O. V. Koval’chukova V. E. Zavodnik O. V. Avramenko B. E. Zaitsev T. S. Tamurova 《Russian Journal of Inorganic Chemistry》2008,53(10):1581-1585
Seven complexes of manganese(II), copper(II), cadmium, silver(I), samarium(III), and praseodymium( III) with 3-hydroxy-4,6-dinitro-2-ethoxypyridine (HL) were isolated in the crystalline state and studied by IR and UV spectroscopy. The molecular and crystal structures of di(3-hydroxy-4,6-dinitro-2-ethoxypyridinato) diaquacopper(II) [CuL2(H2O)2] were determined. The coordination mode of the organic ligand L? is bidentate chelating through the O(2) oxygen atoms of the hydroxy group and the O(1) atom of the ethoxy group. The coordination polyhedron of the copper atom is a prolate tetragonal bipyramid (4 + 2) with two O(1) atoms in the axial positions (Cu-O(1) 2.413 Å) and two O(2) atoms of the two L?ligands and the O(7) atoms of the water molecules in the equatorial plane (Cu-O(2), 1.912 Å; Cu-O(7), 1.972 Å). 相似文献
8.
O. V. Koval’chukova K. K. Palkina S. B. Strashnova B. E. Zaitsev 《Russian Journal of Inorganic Chemistry》2008,53(8):1227-1232
Crystal and molecular structure and spectral characteristics are determined for bis(1-amino-4-azafluoren-9-olium) and bis(2-amino-3-hydroxypyridinium) tetrachlorocobaltates(II): CoCl4(C12H11N2O)2 and CoCl4(C5H7N2O)2, respectively. The structural units of the complexes are CoCl 4 2? anions and organic cations protonated at the pyridine nitrogen atom. 相似文献
9.
S. B. Strashnova B. E. Zaitsev V. E. Zavodnik O. V. Kovalchukova D. P. Voronin 《Russian Journal of Coordination Chemistry》2007,33(11):850-856
Two types of complexes of 2-phenyl-4-(piperidyl-1)-pyrido[2,3-a]anthraquinone (L) with transition metals were isolated from neutral acetonitrile and acidified acetonitrile and ethanol solutions and characterized. Metal complexes synthesized at pH = 7 had the composition MCl2L · (CH3CN) n (M = Cu, Co, Ni). The complexes (HL)2[Cu2Cl6] (I), (HL)2[CoCl4] (II), (HL)2[Zn(NO3)4] (III) were obtained at pH = 1–2. The molecular and crystal structure of complex III was determined. Some spectral parameters of L and its complexes were measured. 相似文献
10.
Koval'chukova O. V. Strashnova S. B. Zaitsev B. E. Vovk T. V. 《Russian Journal of Coordination Chemistry》2002,28(11):767-770
The complexes ML2 · 2H2O and CrL3 · 8H2O were synthesized by the reaction of Cu(II), Ni(II), Co(II), Cd(II), and Cr(III) nitrates with 3-hydroxypyridine (HL) and identified. The spectroscopic characteristics of neutral, anionic, and cationic forms of the ligand were determined. It was shown that 3-hydroxypyridine enters the complex as an anion to give polymeric chains due to the ligand coordination through the N and O atoms. Complexation of copper, cobalt, and chromium nitrates with 3-hydroxypyridine in ethanol solutions was studied, and the formation constant of the copper complex was calculated. It was found that Cu(II) and Cr(III) complexes are formed in the solid state and in solutions (M : L = 1 : 2 and 1 : 3, respectively; in the case of Cu(II), the M : L ratio is 1 : 3). 相似文献