排序方式: 共有27条查询结果,搜索用时 15 毫秒
1.
E. V. Shadrina O. N. Malinkina T. G. Khonina A. B. Shipovskaya V. I. Fomina E. Yu. Larchenko N. A. Popova I. G. Zyryanova L. P. Larionov 《Russian Chemical Bulletin》2015,64(7):1633-1639
The biomimetic sol—gel synthesis of silicon—chitosan-containing glycerohydrogels was carried out using silicon tetraglycerolate as a precursor. It was found that chitosan accelerates gel formation in weakly acidic media. In more acidic media, the kinetics of the process changes according to the curve with a maximum, which can be attributed to different mechanisms of silanol condensation before and after the isoelectric point. The investigated silicon—chitosan-containing glycerohydrogels exhibit antibacterial, anti-inflammatory, and wound healing activity. The synthesized hybrid glycerohydrogels are promising materials for biomedical applications. 相似文献
2.
I. A. Zyryanova L. V. Baikalova O. A. Tarasova A. V. Afonin V. A. Kukhareva M. A. Maksimova B. A. Trofimov 《Russian Journal of General Chemistry》2005,75(8):1283-1289
With respect to Co2+, Ni2+, Zn2+,Cd2+, Cu2+, Pd2+, and Sn4+ salts, 1-isopropenyl-substituted imidazole, 2-methylimidazole, and pyrazole behave as monodentate ligands with only one coordination center on the N1 and N2 atoms, respectively; 1-isopropenylpyrazole under complex-formation conditions is dealkylated to form pyrazole complexes. The reaction with HCl leaves the unsaturated substituent in 1-isopropenylimidazole intact and yields corresponding hydrochlorides by the N3 atom of the heterocycle. The least basic 1-isopropenylpyrazole takes up HCl also by the double bond of the alkenyl group. 相似文献
3.
L. V. Baikalova V. I. Sokol I. A. Zyryanova I. V. Fedyanin V. N. Khrustalev E. A. Zel’bst O. A. Tarasova V. S. Sergienko B. A. Trofimov 《Russian Journal of General Chemistry》2006,76(5):791-797
The crystal and molecular structures of bis(1-isopropenylimidazole)dichlorocobalt (C12H16Cl2·N4Co) [R 0.036 (R W 0.089) for 3229 unique reflections with I > 2σ(I)] and tetra(1-vinylimidazole)dichlorocobalt (C20H24Cl2N8Co) [R 0.031 (R W 0.072) for 1863 unique reflections with I > 2σ(I)] were determined. In these molecular complexes, the monodentate terminal 1-alkenylimidazole ligands coordinate to the metal via a “pyridine” nitrogen atom. In C12H16Cl2N4Co, the Co atom has a distorted tetrahedral 2N,2Cl coordination. The coordination polyhedron of cobalt in C20H24Cl2N8Co is a strongly elongated 4N,2Cl octahedron. The Co-N and Co-Cl bonds [Co-N 2.015(2) and 2.032(4) Å; Co-Cl 2.229(2) Å] in the tetrahedral complex C12H16Cl2N4Co are shorter than those in the octahedral complex C20H24Cl2N8Co [Co-N 2.134(2) and 2.157(2) Å; Co-Cl 2.518(1) Å]. In the structures of both complexes there are short contacts involving the Cl atoms. 相似文献
4.
Baikalova L. V. Zyryanova I. A. Tarasova O. A. Chipanina N. N. Shmidt E. Yu. Kashik T. V. Afonin A. V. Sinegovskaya L. M. Vashchenko A. V. Trofimov B. A. 《Russian Journal of General Chemistry》2003,73(10):1634-1640
1-Allenylpyrazole and 1-allenyl-1,2,4-triazole react with hydrogen chloride via proton addition at the pyridine-like nitrogen atom (N2 and N4, respectively). In the reaction with 1-allenylpyrazole, 1-[(E)-3-chloro-1-propenyl]pyrazole is also formed via regio- and stereoselective addition of hydrogen chloride to the propadienyl group. 1-Allenylpyrazole and 1-allenyl-1,2,4-triazole act as unidentate ligands with respect to Co, Ni, Cu, Zn, Cd, Pd, and Sn, the donor centers being N2 and N4, respectively. Apart from mononuclear coordination compounds, 1-allenylpyrazole gives rise to polymeric complexes which contain units and blocks formed by the free ligand. 相似文献
5.
M. M. Zyryanova P. V. Snytnikov Yu. I. Amosov S. A. Ven’yaminov E. Z. Golosman V. A. Sobyanin 《Kinetics and Catalysis》2010,51(6):907-913
The screening of commercial nickel catalysts for methanation and a series of nickel catalysts supported on CeO2, γ-Al2O3, and ZrO2 in the reaction of selective CO methanation in the presence of CO2 in hydrogen-containing mixtures (1.5 vol % CO, 20 vol % CO2, 10 vol % H2O, and the balance H2) was performed at the flow rate WHSV = 26000 cm3 (g Cat)−1 h−1. It was found that commercial catalytic systems like NKM-2A and NKM-4A (NIAP-07-02) were insufficiently effective for the
selective removal of CO to a level of <100 ppm. The most promising catalyst is 2 wt % Ni/CeO2. This catalyst decreased the concentration of CO from 1.5 vol % to 100 ppm in the presence of 20 vol % CO2 in the temperature range of 280–360°C at a selectivity of >40%, and it retained its activity even after contact with air.
The minimum outlet CO concentration of 10 ppm at 80% selectivity on a 2 wt % Ni/CeO2 catalyst was reached at a temperature of 300°C. 相似文献
6.
O. V. Andreev Yu. G. Denisenko E. I. Sal’nikova N. A. Khritokhin K. S. Zyryanova 《Russian Journal of Inorganic Chemistry》2016,61(3):296-301
Reactions of cerium sulfate and europium sulfate with hydrogen have been studied. Diagrams showing the evolution of phase composition of the polycrystalline products of reaction between europium sulfate and hydrogen are constructed. The reaction of Ce2(SO4)3 with hydrogen at 600°С consecutively yields Ce2O2S and Ce2O3 phases. At 800°С the batch is >95 mol % Ce2O3. At 480-500°С, a single-phase sample of EuSO4 is prepared; at 600-1000°С, Eu2O2S is prepared; and at 1050°С, the batch is >95 mol % Eu2O2S and up to 5 mol % Eu2O3. Atomic-force microscopy shows that europium sulfate grains, which represent agglomerates of particles 10-20 μm in size, are degraded upon reaction with hydrogen into individual ovalshaped particles sized 40-60 × 130-200 nm. 相似文献
7.
8.
L. V. Baikalova L. N. Sobenina A. I. Mikhaleva I. A. Zyryanova N. N. Chipanina A. V. Afonin B. A. Trofimov 《Russian Journal of Organic Chemistry》2001,37(12):1736-1740
Condensation of 5-amino-3-(2-pyrrolyl)pyrazoles with 1-vinyl(ethyl)-2-formylimidazoles afforded complex heterocyclic ensembles: Schiff bases containing pyrrole, pyrazole, and imidazole rings. The cis,trans-orientation of CH = N and CH2 = CH groups and E-isomeric structure of the Schiff bases under study with respect to the imine fragment, and also the presence of intra- and intermolecular hydrogen bonds were established. 相似文献
9.
Baikalova L. V. Tarasova O. A. Zyryanova I. A. Afonin A. V. Sinegovskaya L. M. Trofimov B. A. 《Russian Journal of General Chemistry》2002,72(8):1294-1298
Monomeric complexes ML
n
X
m
, where M = Co2
+, Ni2
+, Zn2
+, Cd2
+, Cu2
+, Pd2
+, Sn4
+; L = 1-allenylimidazole, 1-allenyl-2-methylimidazole, 1-allenylbenzimidazole; n = 2, 4; m = 1, 2, 4; X = Cl, OCOCH3, was prepared for the first time, and their structure was studied by NMR and IR spectroscopy. In the complexes, 1-allenylimidazoles act as monodentate ligands coordinating via the heteroring N3atom, and the CH2 = C = CH group is stabilized by coordination of the azolyl ring with the metal, which hinders elec- tron transfer from the heteroring to the allenyl fragment. The prospective use of the complexes of Zn(OCOCH3)2 with 1-allenyl imidazole derivatives as antidotes and antihypoxants was demonstrated. 相似文献
10.