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排序方式: 共有291条查询结果,搜索用时 312 毫秒
221.
Svetlana I. Pomogailo Gulzhian I. Dzhardimalieva Anatolii D. Pomogailo 《Macromolecular Symposia》2008,270(1):95-105
Summary : Cluster-containing monomers were obtained and characterized. Mono- and disubstituted products were obtained under mild conditions via the interaction of Rh6(CO)16 with 4-vinylpyridine (4-VPy). Substitution of labile acetonitrile ligand in Rh6(CO)15NCMe by allyldiphenylphosphine (AlPPh2) yields Rh6(CO)14(µ,η2-PPh2CH2CHCH2) with formation of π-complex. The copolymerization of cluster-containing monomers synthesized with traditional monomers has been studied. It was found that Rh6- containing monomers change neither the ligand surroundings nor the structure of cluster monomer framework during polymerization reaction. Polymer-immobilized clusters were found to be active in hydrogenation reactions of cyclohexene. 相似文献
222.
Acoustical Physics - The problem of diffraction by an elongated body of revolution with impedance boundary conditions is studied. The case of axial incidence of a high-frequency wave is considered.... 相似文献
223.
Removal of heavy metal ions from aqueous solutions by alkaline-earth metal phosphates 总被引:4,自引:0,他引:4
Irina L. Shashkova Anatolii I. Ratko Natalia V. Kitikova 《Colloids and surfaces. A, Physicochemical and engineering aspects》1999,160(3):1081-215
The possibility of utilization of calcium or magnesium phosphates of various composition for heavy and non-ferrous metal extraction from aqueous solutions has been studied. The efficiency of the phosphates in removal of Pb(II), Cr(III) and Fe(III) ions has been shown to decrease in the following sequence: Mg3(PO4)2>MgNH4PO4>Ca3(PO4)2>CaHPO4>Ca10(PO4)6(OH)2 which is inverse to their hydrolytic stability series. It has been established that phosphates of non-apatite structure are capable of binding up to 12 mmol g−1 of the named heavy metals by a chemical interaction. Hydroxyapatite interacts with the polyvalent metal ions via either the above mentioned or ion-exchange mechanism, depending on preparation method used for the apatite and the nature of metal. 相似文献
224.
Anatolii S. Burlov Valery G. Vlasenko Yurii V. Koshchienko Nadezhda I. Makarova Mikhail A. Kiskin Alexandra A. Kolodina Dmitrii A. Garnovskii Alexander A. Zubenko Yurii D. Drobin Alexander L. Trigub Anatolii V. Metelitsa 《应用有机金属化学》2020,34(1):e5302
A series of Zn(II) complexes of the tridentate azomethine ligands, condensation products of 2-(N-tosylamino)benzaldehyde and 2-aminoalkylpyridines, were synthesized by chemical and electrochemical methods. All compounds were characterized on the basis of C, H, N elemental analysis, Fourier-transform infrared, 1H nuclear magnetic resonance, UV–Vis, and photoluminescence studies. The local atomic structures of complexes were determined from analysis of extended X-ray absorption fine structure and X-ray absorption near-edge structure of Zn K-edges. The molecular structure of chloro-{4-methyl-N-[2-[(Z)-2-pyridyl)ethyliminomethyl]phenyl]benzenesulfamide}zinc(II) was determined by X-ray single-crystal diffraction. The fluorescence spectra show that these complexes in dimethyl sulfoxide solutions at room temperature emit bright blue luminescence at 435–461 nm with fluorescence quantum yields in the range of 0.20–0.31. The assignment and the nature of the bands in experimental UV–Vis spectra of complexes were analyzed using time-dependent density functional theory calculations B3LYP/6-31G(d). The azomethines and complexes of zinc have been screened for their antibacterial, protistocidal, and fungistatic activities against Penicillium italicum, Colpoda steinii, Escherichia coli 078, and Staphylococcus aureus P-209, and the results are compared with the activity of furazolidone, chloroquine, and Fundazol. 相似文献
225.
Alexander A. Zubenko Anatolii S. Morkovnik Lyudmila N. Divaeva Oleg P. Demidov Viktor G. Kartsev Vadim S. Sochnev Alexander I. Klimenko Natalia M. Dobaeva Gennadii S. Borodkin Anatolii N. Bodryakov Marya A. Bodryakova Leonid N. Fetisov 《Mendeleev Communications》2021,31(1):125-127
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226.
Dr. Dimitrije Mara Prof. Anna M. Kaczmarek Dr. Flavia Artizzu Anatolii Abalymov Prof. Andre G. Skirtach Prof. Kristof Van Hecke Prof. Rik Van Deun 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(21):6479-6488
In recent years, luminescent materials doped with Ln3+ ions have attracted much attention for their application as optical thermometers based on both downshifting and upconversion processes. This study presents research done on the development of highly sensitive optical thermometers in the physiological temperature range based on poly(methyl methacrylate) (PMMA) films doped with two series of visible Ln3+ complexes (Ln3+=Tb3+, Eu3+, and Sm3+) and SiO2 nanoparticles (NPs) coated with these PMMA films. The best performing PMMA film doped with Tb3+ and Eu3+ complexes was the PMMA[TbEuL1tppo]1 film (L1=4,4,4-trifluoro-1-phenyl-1,3-butadionate; tppo=triphenylphosphine oxide), which showed good temperature sensing of Sr=4.21 % K−1 at 313 K, whereas for the PMMA films doped with Tb3+ and Sm3+ complexes the best performing was the PMMA[TbSmL2tppo]3 film (L2=4,4,4-trifluoro-1-(4-chlorophenyl)-1,3-butadionate), with Sr=3.64 % K−1 at 313 K. Additionally, SiO2 NPs coated with the best performing films from each of the series of PMMA films (Tb–Eu and Tb–Sm) and their temperature-sensing properties were studied in water, showing excellent performance in the physiological temperature range (PMMA[TbEuL1tppo]1@SiO2: Sr=3.84 % °C at 20 °C; PMMA[TbSmL2tppo]3@SiO2: Sr=3.27 % °C at 20 °C) and the toxicity of these nanoparticles on human cells was studied, showing that they were nontoxic. 相似文献
227.
Ivan N. Myasnyanko Alexey S. Gavrikov Snizhana O. Zaitseva Dr. Alexander Yu. Smirnov Elvira R. Zaitseva Anatolii I. Sokolov Kseniya K. Malyshevskaya Dr. Nadezhda S. Baleeva Dr. Alexander S. Mishin Dr. Mikhail S. Baranov 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(12):3986-3990
Using benzylidene imidazolone core, we created a panel of color-shifted fluorogenic ligands for FAST protein without compromise to the binding efficiency and the utility for live-cell protein labeling. This study highlights the potential of benzylidene imidazolones derivatives for rapid expansion of a pallet of live-cell fluorogenic labeling tools. 相似文献
228.
Anatolii D. Pomogailo 《Macromolecular Symposia》2002,186(1):15-22
The topochemistry of the distribution of metal complexes on macromolecule ligands is studied on an example of macrocomplexes obtained by the interaction of transition metal compounds (MXn) with functional groups of the grafted layer (PE-gr-polyallylamine, PE-gr-polyacrylic acid, PE-gr-poly-4-vinylpyridine, etc.). Three main types of macrocomplexes are found out: I - isolated complexes (r̄ ≥ 15 Å); II - the aggregations of cluster types (complexes of paramagnetic metals unbounded chemically between each other) (r̄ ≤ 7 Å). III - clusters with a strong exchange interaction (exchange-bound clusters caused by chemical bonds of complexes similar to polynuclear complexes). The ratio and distances between complexes of differen types as well as their possible role in catalytic processes are estimated and discussed. 相似文献
229.
230.
Anatolii V. Zhuchok 《Algebra Universalis》2017,77(3):361-374
In this paper, we consider doppelsemigroups, which are sets with two binary associative operations satisfying additional axioms. Commutative dimonoids in the sense of Loday are examples of doppelsemigroups and two interassociative semigroups give rise to a doppelsemigroup. The main result of this paper is the construction of the free product of doppelsemigroups. We also construct the free doppelsemigroup, the free commutative doppelsemigroup, the free n-nilpotent doppelsemigroup, and characterize the least commutative congruence and the least n-nilpotent congruence on a free doppelsemigroup. 相似文献