排序方式: 共有11条查询结果,搜索用时 15 毫秒
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Panikorovskii T. L. Pekov I. V. Krzhizhanovskaya M. G. Yakovenchuk V. N. Britvin S. N. Gurzhiy V. V. Bocharov V. N. Yapaskurt V. O. Krivovichev S. V. 《Crystallography Reports》2021,66(1):76-85
Crystallography Reports - Microporous silicate tiettaite from the Khibiny alkaline massif (Kola Peninsula, Russia) has been studied using X-ray diffraction analysis, electron probe microanalysis,... 相似文献
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Prof. Sergey N. Britvin Dr. Sergei A. Kashtanov Dr. Maria G. Krzhizhanovskaya Dr. Andrey A. Gurinov Dr. Oleg V. Glumov Dr. Stanislav Strekopytov Dr. Yury L. Kretser Prof. Anatoly N. Zaitsev Prof. Nikita V. Chukanov Prof. Sergey V. Krivovichev 《Angewandte Chemie (International ed. in English)》2015,54(48):14340-14344
The Group 18 elements (noble gases) were the last ones in the periodic system to have not been encountered in perovskite structures. We herein report the synthesis of a new group of double perovskites KM(XeNaO6) (M=Ca, Sr, Ba) containing framework‐forming xenon. The structures of the new compounds, like other double perovskites, are built up of the alternating sequence of corner‐sharing (XeO6) and (NaO6) octahedra arranged in a three‐dimensional rocksalt order. The fact that xenon can be incorporated into the perovskite structure provides new insights into the problem of Xe depletion in the atmosphere. Since octahedrally coordinated XeVIII and SiIV exhibit close values of ionic radii (0.48 and 0.40 Å, respectively), one could assume that XeVIII can be incorporated into hyperbaric frameworks such as MgSiO3 perovskite. The ability of Xe to form stable inorganic frameworks can further extend the rich and still enigmatic chemistry of this noble gas. 相似文献
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Oleg L. Eliseev Tatyana N. Bondarenko Sergey N. Britvin Polina P. Khodorchenko Albert L. Lapidus 《Mendeleev Communications》2018,28(3):264-266
Rhodium-catalysed hydroformylation of styrene and aliphatic olefins under biphasic conditions in the presence of watersoluble 1,4,7-triaza-9-phosphatricyclo[5.3.2.14,9]tridecane (CAP) chemoselectively affords aldehydes. Multiple catalyst reuse without loss in performance is demonstrated. 相似文献
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Between Adamantane and Atrane: Intrabridgehead Interactions in the Cage‐Like Phosphane Related to a Novel Tris(homoadamantane) Ring System 下载免费PDF全文
Prof. Dr. Sergey N. Britvin Andrey M. Rumyantsev Dr. Anastasia E. Zobnina Prof. Dr. Marina V. Padkina 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(40):14227-14235
Herein, we report unusual four‐center interactions in the novel cage‐like phosphane, 1,4,7‐triaza‐9‐phosphatricyclo[5.3.2.14,9]tridecane (CAP). This water‐soluble ligand, the first example of a tris(homoadamantane) ring system, can be considered a macrocyclic homologue of the well‐known PTA (1,3,5‐triaza‐7‐phosphaadamantane). However, 31P NMR spectroscopic anomalies of CAP follow those typical for the bi‐/tricyclic atrane systems. Another atrane‐like feature of CAP is the ability of one nitrogen atom to undergo out–in pyramidal inversion. The latter is associated with a substantial decrease in the intracage N?N and P?N distances. Analysis of electron density distribution [molecular electrostatic potential (MESP) and atoms‐in‐molecules (AIM) approaches] suggests that the P and N atoms in the pyramidally inverted CAP derivatives are involved in interactions resulting in accumulation of electron density at the center of the phosphane cage. The latter can reliably explain the stereoelectronic and NMR anomalies of the new ligand. The semi‐flexible CAP cage populates the structural niche between the rigid adamantine skeleton of PTA and flexible atrane systems and can be regarded as an alternative to PTA in aqueous coordination chemistry. 相似文献
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Britvin A. V. Nikitenko N. S. Plyusnin V. F. Poller B. V. Poller A. B. Shakhov N. V. 《Optics and Spectroscopy》2022,130(3):150-155
Optics and Spectroscopy - We studied the photostability of planar-fiber structures in the form of films with a thickness of 600–800 µm under long-term ultraviolet irradiation. The films... 相似文献
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Sergey N. Britvin Oleg I. Siidra Dr. Sergey V. Krivovichev Wulf Depmeier 《无机化学与普通化学杂志》2009,635(3):518-522
Orange prismatic crystals of the first thallium hydrous nesosilicate Tl4SiO4·0.5H2O have been obtained by evaporation from aqueous solution. There are three symmetrically independent Tl+ cations and five symmetrically independent oxygen atoms in the structure of Tl4SiO4·0.5H2O. The O(4) and O(5) atoms belong to water molecules. Coordination polyhedra of the Tl+ cations are strongly distorted because of the stereoactive behavior of lone electron pairs. The structure of Tl4SiO4·0.5H2O contains sheets of SiO4 tetrahedra and Tl coordination polyhedra. The sheets have the composition [Tl3SiO4]– and are parallel to [100]. Within the sheets, SiO4 tetrahedra link to thallium polyhedra though common corners. The sheets are linked by dimers of face‐sharing Tl(3)O5 polyhedra, thus providing interconnection of the sheets into a framework. The framework has large elliptical channels occupied by water molecules (OW2) and electron pairs of Tl+ cations.The comparison with some other M+ (M = K, Ag, Tl) silicates is given. 相似文献
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The system of equations describing the thermal orientation effect in nonchiral liquid crystals, which was observed earlier,
is proposed and substantiated. The effect of the director reorientation under the action of the temperature gradient is in
many ways analogous to the Freedericksz transition in electric or magnetic fields. The angle of deviation of the director
from the initial position is determined by the square of the temperature gradient. The effect is observed for a nematic liquid
crystal, initially uniformly oriented, and is not accompanied by macroscopic fluxes of the medium under stationary conditions. 相似文献
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