排序方式: 共有15条查询结果,搜索用时 9 毫秒
1.
O. V. Konnik Z. Z. Bekirova V. F. Shul’gin S. B. Meshkova P. G. Doga S. S. Smola G. G. Aleksandrov I. L. Eremenko 《Russian Journal of Inorganic Chemistry》2014,59(4):308-314
The coordination compounds of neodymium(III), samarium(III), and europium(III) with the acyldihydrazones of imino-, oxo-, and thiodiacetic acids and 3-methyl-1-phenyl-4-formylpyrazol-5-one were synthesized and studied. According to X-ray diffraction data, the complexes are binuclear and the lanthanide cations are linked by three binucleating ligands. The coordination polyhedra have a three-cap triangular prism geometry, the prism bases being formed by oxygen atoms and the vertices being occupied by the imine nitrogen atoms. Solid Nd(III) and Sm(III) complexes show intense luminescence in the spectral regions characteristic of these cations. Europium(III) complexes are liminescence-inactive due to the low efficiency of excitation energy transfer to the resonance levels of the central atom. 相似文献
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S. B. Meshkova P. G. Doga A. A. Kucher 《Russian Journal of Coordination Chemistry》2017,43(10):657-662
The influence of the aggregate state on the IR luminescence is studied for the Nd(III), Sm(III), and Yb(III) complexes with the thienyl, phenyl, and alkyl derivatives of acetylacetone in solutions and as sorbates on the polymer matrix. It is found that the luminescence intensity of the sorbates of the complexes is 2–3 orders of magnitude higher than that in solutions due to the elimination of diffusion and respective intermolecular nonradiative losses of the excitation energy. 相似文献
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S. B. Meshkova Z. M. Topilova V. S. Matiichuk N. T. Pokhodylo I. P. Kovalevskaya I. M. Rakipov P. G. Doga 《Russian Journal of Coordination Chemistry》2011,37(4):309-315
The luminescence method, mass spectrometry, and elemental analysis are used to reveal that under optimal conditions (pH 5–8) Ln3+ ions (Ln = Pr, Sm, Eu, Nd, and Yb) with 1-(2-hydroxy-4-methylphenyl)-3-(5-methyl-1-phenyl-1 H-1,2,3-triazol-4-yl)propane-1,3-dione form complexes with the mole ratio Ln: ligand = 2: 3. According to the IR spectral data, Ln3+ ions coordinate three oxygen atoms of two carbonyl groups and one hydroxyl group. In the IR spectra of the complexes, an intense band at 628.7 cm?1 is assigned to the Ln-O bond vibrations. The X-ray diffraction patterns of the complexes contain no lines corresponding to the ligand. The luminescence intensity of the complexes in the visible spectral range changes in the series Eu(III) > Sm(III) > Pr(III), whereas in the IR region the order is Yb(III) > Nd(III). In all cases, luminescence of the solid complexes is considerably more intense than that of their solutions. 相似文献
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S. B. Meshkova P. G. Doga V. P. Antonovich 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2016,90(4):870-875
The effect condensed media based on water-soluble polymers (WSPs) have on the luminescence of Eu3+ and Tb3+ complexes with derivatives of benzoic acid and β-diketones is investigated. The effect of WSPs is found to depend on the ratio between the triplet energy levels of polymers and ligands. The most intense luminescence is observed in WSP films. The possibility of a proportional increase in the intensity of Ln3+ luminescence in WSP solutions over a wider range of concentrations than in an aqueous solution, and of a considerable increase in Ln3+ luminescence in WSP solutions and films in the presence of d- and f-element quenchers, is established. 相似文献
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Dogaš Vesna Gotovac Helisová Kateřina 《Methodology and Computing in Applied Probability》2021,23(2):503-526
Methodology and Computing in Applied Probability - This paper concerns a method of testing the equality of distributions of random convex compact sets. The main theoretical result involves a... 相似文献
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P. G. Doga S. B. Meshkova V. F. Shul’gin A. N. Gusev E. V. Lobko N. V. Kozak S. S. Smola 《Russian Journal of Inorganic Chemistry》2013,58(11):1341-1348
The optimal conditions for complex formation in solutions and synthesis of solid Eu(III) and Tb(III) complexes with acylated derivatives of aminobenzoic acid have been determined. The character and degree of effect of organic solvents, additional ligands, and surfactants on the complex photoluminescence intensity have been established. 相似文献
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Wole-Osho Ifeoluwa Okonkwo Eric C. Adun Humphery Kavaz Doga Abbasoglu Serkan 《Journal of Thermal Analysis and Calorimetry》2021,144(3):671-688
Journal of Thermal Analysis and Calorimetry - Hybrid nanofluids are better heat transfer fluids than conventional nanofluids because of the combined properties of two or more nanoparticles. In this... 相似文献
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S. B. Meshkova P. G. Doga A. V. Kiriyak A. A. Kucher 《Russian Journal of Inorganic Chemistry》2016,61(1):73-80
Changes in the luminescence characteristics of Tb3+ complexes with hydroxybenzoic acids in the series true solution–viscous medium of a water-soluble polymer (WSP)–WSP film have been studied. The existence of oxygen-containing functional groups in WSPs and the possibility of their coordination to Tb3+ ions, as well the viscous medium created by WSPs, are responsible for changes in characteristics of the complexes, such as luminescence intensity and lifetime. Interligand energy transfer (\({E_{{T_1}}}\left( {Lig} \right) \geqslant {E_{{T_1}}}\left( {WSP} \right)\)) in viscous media leads either to an increase or a decrease in luminescence intensity; however, it is increased multifold in films. 相似文献
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