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排序方式: 共有194条查询结果,搜索用时 15 毫秒
1.
2.
Blokhina S. V. Bykova V. V. Sharapova A. V. Ol'khovich M. V. Trostin A. N. 《Russian Journal of General Chemistry》2003,73(2):257-259
The sorption properties of stationary phases based on nematic p-substituted azoxybenzenes were studied. Correlations were revealed between the structural selectivity of mesogens, chemical nature of terminal substituents, capability for dispersion interactions and polarity of the sorbents, temperature gradient of the retention indices, and thermodynamic parameters of solution of xylene isomers in the sorbents. 相似文献
3.
The temperature dependences of the heat capacities of crystalline tetraphenyltetrahydroxycyclotetrasiloxane, octaphenyltetrahydroxytricyclooctasiloxane, and octaphenylpentacyclosilsesquioxane and of glassy polyphenylsilsesquioxane were measured in the range 6-300 K with an adiabatic vacuum calorimeter, with an accuracy of 0.3%. From these data, the thermodynamic functions C
0
p
(T), H
0(T) - H
0(0), S
0(T) - S
0(0), and G
0(T) - H
0(0) of these substances were calculated for the range 0-300 K. The standard entropies of their formation from elements at 298.15 K,
f
S
0, and the entropies of mutual transformations of these substances in the range 0-298.15 K were calculated. 相似文献
4.
B. E. Ivanov L. A. Valitova T. G. Bykova N. V. Yakimova 《Russian Chemical Bulletin》1978,27(7):1416-1418
Conclusions The reaction of 2,2-bis(4-hydroxy-3-N,N-diethylaminomethylphenyl)propane with triethyl phosphite gave 2,2-bis(4-ethoxy-3-diethylphosphonomethylphenyl)propane via the intermediate formation of a compound with a pentacovalent phosphorus atom. In the presence of acetic acid the reaction leads to 2,2-bis(4-hydroxy-3-diethylphosphonomethylphenyl)propane.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1621–1624, July, 1978. 相似文献
5.
Bykova K. A. Kostenko A. A. Kucherenko A. S. Zlotin S. G. 《Russian Chemical Bulletin》2019,68(7):1402-1406
Russian Chemical Bulletin - Bifunctional C2-symmetric organocatalysts derived from chiral 1,2-diaminoethanes and (S)-2-aminomethylpyrrolidine were fi rst used for promoting the asymmetric Michael... 相似文献
6.
7.
S. P. Khranenko E. A. Bykova K. V. Yusenko A. P. Tyutyunnik S. A. Gromilov 《Journal of Structural Chemistry》2013,54(5):931-936
X-ray crystallographic analysis is used to determine the crystal structures of [Ru(NH3)6](MoO4)Cl·3H2O and [M(NH3)6](ReO4)3·2H2O (M = Ru, Ir) complex salts. The features of the fragment packing are studied. 相似文献
8.
Sebastian Vogel Maxim Bykov Elena Bykova Sebastian Wendl Simon D. Kloß Anna Pakhomova Natalia Dubrovinskaia Leonid Dubrovinsky Wolfgang Schnick 《Angewandte Chemie (International ed. in English)》2020,59(7):2730-2734
Owing to its outstanding elastic properties, the nitride spinel γ‐Si3N4 is of considered interest for materials scientists and chemists. DFT calculations suggest that Si3N4‐analog beryllium phosphorus nitride BeP2N4 adopts the spinel structure at elevated pressures as well and shows outstanding elastic properties. Herein, we investigate phenakite‐type BeP2N4 by single‐crystal synchrotron X‐ray diffraction and report the phase transition into the spinel‐type phase at 47 GPa and 1800 K in a laser‐heated diamond anvil cell. The structure of spinel‐type BeP2N4 was refined from pressure‐dependent in situ synchrotron powder X‐ray diffraction measurements down to ambient pressure, which proves spinel‐type BeP2N4 a quenchable and metastable phase at ambient conditions. Its isothermal bulk modulus was determined to 325(8) GPa from equation of state, which indicates that spinel‐type BeP2N4 is an ultraincompressible material. 相似文献
9.
V. S. Zhigalov L. E. Bykova V. G. Myagkov A. N. Pavlova M. N. Volochaev A. A. Matsynin G. S. Patrin 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2020,14(1):47-53
The structure and magnetic properties of CoPt–Al2O3 nanocomposite films synthesized by the annealing of Al/(Co3O4 + Pt) bilayers on a MgO(001) substrate at 650°C in vacuum are investigated. The synthesized composite films contain ferromagnetic CoPt grains with an average size of 25–45 nm enclosed in a nonconducting Al2O3 matrix. The saturation magnetization (Ms ~ 330 G) and coercivity (Hc ≈ 6 kOe) of the films are measured in the film plane and perpendicular to it. The obtained films are characterized by a spatial rotational magnetic anisotropy, which makes it possible to arbitrarily set the easy magnetization axis in the film plane or perpendicular to it using a magnetic field stronger than the coercivity (H > Hc). 相似文献
10.
Dr. Ines E. Collings Dr. Elena Bykova Dr. Maxim Bykov Dr. Sylvain Petitgirard Dr. Michael Hanfland Dr. Damian Paliwoda Prof. Leonid Dubrovinsky Prof. Natalia Dubrovinskaia 《Chemphyschem》2016,17(21):3369-3372
The incorporation of noble gas atoms, in particular neon, into the pores of network structures is very challenging due to the weak interactions they experience with the network solid. Using high‐pressure single‐crystal X‐ray diffraction, we demonstrate that neon atoms enter into the extended network of ammonium metal formates, thus forming compounds Nex[NH4][M(HCOO)3]. This phenomenon modifies the compressional and structural behaviours of the ammonium metal formates under pressure. The neon atoms can be clearly localised within the centre of [M(HCOO)3]5 cages and the total saturation of this site is achieved after ~1.5 GPa. We find that by using argon as the pressure‐transmitting medium, the inclusion inside [NH4][M(HCOO)3] is inhibited due to the larger size of the argon. This study illustrates the size selectivity of [NH4][M(HCOO)3] compounds between neon and argon insertion under pressure, and the effect of inclusion on the high‐pressure behaviour of neon‐bearing ammonium metal formates. 相似文献