Аннотация

1.

Zhigzhitzhapova, S.V. Chemical composition of volatile organic compounds of Artemisia vulgaris L. (Asteraceae) from the Qinghai-Tibet Plateau / S.V. Zhigzhitzhapova, L.D. Radnaeva, Q.B. Gao et al. // Industrial Crops and Products. – 2016. – Vol. 83. – P. 462-469. https://doi.org/10.1016/j.indcrop.2015.12.083 (IF JСR=5,645 (3,181); Q1). https://www.webofscience.com/wos/woscc/full-record/WOS:000370894000059

Plants growing in different climate retain the general direction of the biosynthesis of the volatile organic compound (VOC). The aim of this study was to investigate the VOC composition in Artemisia vulgaris L. growing on the Qinghai–Tibet Plateau. The VOCs were isolated by hydrodistillation or by headspace extraction, and their composition was analyzed by gas chromatography–mass spectrometry (GC–MS). There were 96 VOCs identified in the samples, accounting for 91–97% of the total. Monoterpenes (80.33%) were the main components of VOCs released by headspace extraction. The major components of essential oil obtained by hydrodistillation were monoterpenes (44.49%) and sesquiterpenes (29.98%). The monoterpenes 1,8-cineole, camphor, and α- and β- thujones were the main VOCs detected after both hydrodistillation and headspace extraction. Sesquiterpenes (cis-davanone, germacrene D) also accounted for a significant proportion of compounds in the essential oil. A principal component analysis (PCA) based on the types of components of essential oils of A. vulgaris collected from different countries showed that the moisture conditions at the collection site was the main factor explaining variations in VOC composition, and were located between “European” and “Siberian” chemotype, which indicated that the essential oil profile does not fully reflect zonal climatic features.

2.

Stelmakh S.A., Ukshe A.E., Mognonov D.M., Novikova K.S., Grigor'eva M.N., Kayumov R.R., Bal'zhinov S.A., Dobrovolsky Y.A. Proton conductivity of new type medium-temperature proton exchange membranes // Ionics. – 2016. – Vol.22 (№10). – pp.1873–1880. Doi: 10.1007/s11581-016-1722-1 (IF JCR=1.754; Q2)

https://link.springer.com/content/pdf/10.1007/s11581-016-1722-1.pdf

This work reports on the analysis of physicochemical properties including proton conductivity of a new class of composite proton exchange membranes based on N-phenyl-substituted polyhexamethylene guanidine (PHMG) and poly-m-phenylene isophthalamide (phenylone) doped with phosphoric acid (PHMGP-PA) at different temperatures and environmental humidity. The presence of a strong ionic bond between protonated PHMGP and phosphoric acid anions allowed one to expect that the composite material is capable to retain phosphoric acid even in conditions of high humidity and temperature.

3.

Reshak, A. H. Electronic structure of monoclinic - Exploration of the Electronic Structure of Monoclinic α-Eu2(MoO4)3: DFT-Based Study and X-ray Photoelectron Spectroscopy / A.H. Reshak, Z.A. Alahmed, J. Bila, V.V. Atuchin, B.G. Bazarov, O.D. Chimitova, M.S. Molokeev, I.P. Prosvirin, A.P. Yelisseyev // J. Phys. Chem. C. – 2016, V. 120, № 19. – Р. 10559−10568. DOI: 10.1021/acs.jpcc.6b01489 (IF JCR 4.536 (2016); Q1).

https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b01489

The powder α-Eu₂(MoO₄)₃ sample was prepared by the solid-state reaction method. The phase purity of the final powder product was verified by X-ray diffraction analysis. The constituent element core levels and valence band are measured by X-ray photoelectron spectroscopy as a function of Ar⁺ ion (2.5 keV, 7–8 μA/cm²) bombardment time. The formation of Mo⁵⁺ and Mo⁴⁺ states at high bombardment times was detected. The Eu–O and Mo–O bonding was considered in comparison with other Eu³⁺- and Mo⁶⁺-containing oxides using binding energy difference parameters. The transparency range obtained for the pure α-Eu₂(MoO₄)₃ tablet is λ = 0.41–0.97 μm, as estimated at the transmission level of 5%. The short-wavelength cut edge in α-Eu₂(MoO₄)₃ is governed by the direct allowed optical transitions within the band gap of E_g = 3.74 eV (300 K). The band structure of α-Eu₂(MoO₄)₃ was calculated by ab initio methods and strongly different results were obtained for the spin up/down configurations. The Eu-4f states are located around 2.2 eV and −4.0 eV for spin up (↑) and the structures situated at around 6.5 and 5.5 eV for spin down (↓) configuration. The calculated spin magnetic moments are in excellent relation to the Slater-Pauling rule and within the Eu sphere the magnetic moment of 4f electrons is ∼5.99 μB.

4.

Kotova, I.Yu. New series of triple molybdates AgA3R(MoO4)5 (A = Mg, R = Cr, Fe; A = Mn, R = Al, Cr, Fe, Sc, In) with framework structures and mobile silver ion sublattices / I.Yu. Kotova, S.F. Solodovnikov, Z.A. Solodovnikova, D.A. Belov, S.Yu. Stefanovich, A.A. Savina, E.G. Khaikina // J. Solid State Chem. – 2016. – V. 238. – P. 121–128. http://dx.doi.org/10.1016/j.jssc.2016.03.003 (IF JCR 2.299; Q2).

https://www.sciencedirect.com/science/article/pii/S0022459616300780?via%3Dihub

Triple molybdates AgA₃R(MoO₄)₅ (A=Mg, R=Cr, Fe; A=Mn, R=Al, Cr, Fe, Sc, In) of the NaMg₃In(MoO₄)₅ type were synthesized and single crystals of AgMg3R(MoO₄)₅ (R=Cr, Fe) were grown. In their structures, the MoO4 tetrahedra, pairs and trimers of edge-shared (Mg, R)O₆ octahedra are connected by common vertices to form a 3D framework. Large framework cavities involve Ag+ cations disordered on three nearby positions with CN=3+1 or 4+1. Alternating (Mg, R)O₆ octahedra and MoO4 tetrahedra in the framework form quadrangular windows penetrable for Ag+ at elevated temperatures. Above 653–673 K, the newly obtained molybdates demonstrate abrupt reduction of the activation energy to 0.4–0.6 eV. At 773 K, AgMg3Al(MoO4)5 shows electric conductivity 2.5·10−2 S/cm and Ea=0.39 eV compatible with characteristics of the best ionic conductors of the NASICON type.

5.

Zolotova, E.S. Phase relations in the Na2MoO4–Cs2MoO4 and Na2MoO4–Cs2MoO4–ZnMoO4 systems, crystal structures of Cs3Na(MoO4)2 and Cs3NaZn2(MoO4)4 / E.S. Zolotova, V.N. Yudin, S.F. Solodovnikov, E.G. Khaikina, O.M. Basovich, I.V. Korolkov, I.Yu. Filatova // J. Solid State Chem. – 2016. – V. 233. – P. 23–29. https://doi.org/10.1016/j.jssc.2015.10.008 (IF JCR- 2.299; Q2).

https://www.sciencedirect.com/science/article/pii/S0022459615301973?via%3Dihub

The phase diagram of the Na2MoO4-Cs2MoO4 system was reinvestigated and a new intermediate compound, Cs3Na(MoO4)(2), melting incongruently at 510 degrees C was found. Its crystal structure (a=6.3461(2), c=8.2209(3) angstrom, sp. gr. P (3) over bar m1, Z=1, R=0.0131) belongs to the glaserite type. Taking into account these data, the subsolidus phase relations of the system Na2MoO4-Cs2MoO4-ZnMoO4 was studied at 420 degrees C. The filling vacancies in the tetrahedral Zn position of the Cs6Zn5(MoO4)(8) structure (sp. gr. 1 (4) over bar 3d, Z=2) following the scheme Zn2+ +square -> 2Na(+) was established to result in the continuous solid solution Cs6Zn5-x square Na-1-x(2x)(MoO4)(8) (0 <= x <= 1). With increasing the x value, the cubic lattice parameter of the solid solution increases linearly while its melting point decreases that testifies to destabilization of the Cs6Zn5(MoO4)(8) structure by a progressive Na+ insertion. In the structure of Cs3NaZn2(MoO4)(4) (a=12.3134(1) angstrom, R=0.0121), Mo04 and (Zn2/3Na1/3)O-4 tetrahedra share corners to form an open 3D framework. The cesium ions are disordered around the centers of the cuboctahedral cavities of the framework to form "clusters" of the central Cs(1) and four disordered Cs(2) positions.

6.

Tsyrenova, G.D. New ferroelastic K2Sr(MoO4)2: Synthesis, phase transitions, crystal and domain structures, ionic conductivity / G.D. Tsyrenova, E.T. Pavlova, S.F. Solodovnikov, N.N. Popova, T.Yu. Kardash, S.Yu. Stefanovich, I.А. Gudkova, Z.A. Solodovnikova, B.I. Lazoryak // // J. Solid State Chem. – 2016. – V. 237. – P. 64–71. https://doi.org/10.1016/j.jssc.2016.01.011 (IF JCR- 2.299; Q2).

https://www.sciencedirect.com/science/article/pii/S0022459616300123?via%3Dihub

K2Sr(MoO4)(2) crystals were synthesized and their properties examined. The distortive polymorphic transformations at 421 K (alpha (LT) -> beta(MT)) and 744 K (beta(MT)->gamma (HT)) of K2Sr(MoO4)(2) were studied. It has been shown that the transitions go in sequence from the high-temperature palmierite K2Pb(SO4)(2)-type gamma-phase (R (3) over barm) to an intermediate beta-phase with a probable incommensurate structure and then to a low-temperature alpha-phase. Domain structures peculiarities in ferroelastic alpha-K2Sr(MoO4)(2) have been investigated. The electrical conductivity of K2Sr(MoO4)(2) rises tenfold in the vicinity of the phase transition at 744 K that may be associated with a change conductivity path from quasi-one-dimensional to two-dimensional. The crystal structure of the alpha-phase (sp. gr. C2/c, a=14.318(3) angstrom, b=5.9337(12) angstrom, c=10.422(2) angstrom, beta=105.83(3)degrees, Z=4, R=0.0219) is similar to that of alpha-Pb-3(PO4)(2). Sr atoms are mainly located at site with the coordination number CN=8 (a tetragonal antiprism with bond lengths of 2.578(2)-2.789(2) angstrom) and K atoms are located at site with CN=9+1.

7.

Stelmakh S.A., Ukshe A.E., Mognonov D.M., Novikova K.S., Grigor'eva M.N., Kayumov R.R., Bal'zhinov S.A., Dobrovolsky Y.A. Proton conductivity of new type medium-temperature proton exchange membranes. Ionics V22, №10, 1873–1880 – 2016. Doi: 10.1007/s11581-016-1722-1 (IF=1.754, Q2) https://link.springer.com/content/pdf/10.1007/s11581-016-1722-1.pdf

Among polymer fuel cells (FC), there is a class of devices where phosphoric acid is used as electrolyte. The retention of acid in a polymer matrix is provided by binding a part of its molecules with basic groups of the polymer. Operating temperature for such medium-temperature FC can attain 150 °C due to high thermal stability and relatively high proton conductivity at low humidity [1]. Increased operating temperature of such FC provides many advantages as compared with low-temperature FC with solid polymer membranes, among which increased tolerance of catalytic materials to CO poisoning is one of the most important parameters. Moreover, high temperature facilitates the organization of water management in the fuel cell: the water does not condense in the liquid phase, and there is no danger of flooding of electrode pores during operation. Thus, CO-enriched hydrogen produced by the reforming of natural gas, other hydrocarbon feedstocks, and alcohols can be used for their work [2, 3].

Nowadays, the most developed polymer electrolyte membranes for medium temperature FC are based on various condensation polymers, composite materials, polymers with nitrogen-containing heterocycles, and complexes of polymers with acids [4]. For medium- and high-temperature FC, the most studied proton conductive membranes are those based on polybenzimidazole (PBI) and its derivatives doped by phosphoric acid [5, 6]. Such membranes show high thermal stability and proton conductivity in the absence of water. However, the major drawback of these materials is associated with acid leaching [7]. Condensation of water vapor formed by the FC operation, for example, by stopping and cooling the battery, leads to phosphoric acid leaching from the electrolyte and its degradation, and penetration of acid on the structural elements leads to corrosion of the latter [8–10]. Thus, the search for new polymer materials that can safely hold the acid anion is one of the important tasks of developing medium-temperature FC.

This work reports on the analysis of physicochemical properties including proton conductivity of a new class of composite proton exchange membranes based on N-phenyl-substituted polyhexamethylene guanidine (PHMG) and poly-m-phenylene isophthalamide (phenylone) doped with phosphoric acid (PHMGP-PA) at different temperatures and environmental humidity. The presence of a strong ionic bond between protonated PHMGP and phosphoric acid anions allowed one to expect that the composite material is capable to retain phosphoric acid even in conditions of high humidity and temperature.

2017

11.

Radnaeva, L. D. Fatty acid composition in the white muscle of Cottoidei fishes of Lake Baikal reflects their habitat depth/ L. D. Radnaeva, D. V. Popov, O. Grahl-Nielsen, I. V. Khanaev, S. V. Bazarsadueva, R. Käkelä. // Environmental Biology of Fishes. – 2017. – V. 100, Issue 12. – P. 1623-1641. https://doi.org/10.1007/s10641-017-0670-6 (IF JСR=1,844 (1,514); Q1). https://www.webofscience.com/wos/woscc/full-record/WOS:000417067100010

Lake Baikal is a unique freshwater environment with maximum depths over 1600 m. The high water pressure at the lakebed strengthens the solidifying effect of low water temperature on animal tissue lipids, and thus the effective temperatures in the depths of the lake equal subzero temperatures in shallow waters. Cottoidei species has colonized the different water layers of the lake, and developed different ecology and physiology reflected in their tissue biochemistry. We studied by gas chromatography the composition of fatty acids (FAs), largely responsible for tissue lipid physical properties, in the white muscle tissue of 13 species of the Cottoidei fish; five benthic abyssal, six benthic eurybathic and two benthopelagic species. The FA profiles reflected habitat depth. The muscles of the deepest living species contained little polyunsaturated FAs (PUFAs) and were instead rich in monounsaturated FAs (MUFAs), which may be due to occasional weak food web links to the PUFA-rich primary producers of the photic water layer, high MUFA supply from their benthic diet, and conversion of saturated FAs (SFAs) to MUFAs in the tissues of the fish. Despite the MUFA percentage among the abyssal species reached even 50% (by weight) of total FAs, the PUFA percentage still remained above 20% in every species. The muscle MUFA/SFA ratio correlated negatively with the PUFA content of the fish muscle, suggesting viscosity control integrating the fluidity contributions from the dietary PUFAs and potentially endogenous MUFAs.

12.

New solid electrolyte Na9Al(MoO4)6: Structure and Na+ ion conductivity / A.A. Savina, V.A. Morozov, A.L. Buzlukov, I.Yu. Arapova, S.Yu. Stefanovich, Y.V. Baklanova, T.A. Denisova, N.I. Medvedeva, M. Bardet, J. Hadermann, B.I. Lazoryak, E.G. Khaikina // Chem. Mater. – 2017. – Vol. 29. – P. 8901–8913. https://doi.org/10.1021/acs.chemmater.7b03989 (IF JCR - 9.466; Q1)

https://pubs.acs.org/doi/pdf/10.1021/acs.chemmater.7b03989

Solid electrolytes are important materials with a wide range of technological applications. This work reports the crystal structure and electrical properties of a new solid electrolyte Na9Al(MoO4)6. The monoclinic

Na9Al(MoO4)6 consists of isolated polyhedral [Al(MoO4)6]9− clusters composed of a central AlO6 octahedron sharing vertices with six MoO4 tetrahedra to form a three-dimensional framework. The AlO6 octahedron also

shares edges with one Na1O6 octahedron and two Na2O6 octahedra. Na3−Na5 atoms are located in the framework cavities. The structure is related to that of sodium ion conductor II-Na3Fe2(AsO4)3. High-temperature conductivity

measurements revealed that the conductivity (σ) of Na9Al(MoO4)6 at 803 K equals 1.63 × 10−2 S cm−1. The temperature behavior of the 23Na and 27Al nuclear magnetic resonance spectra and the spin-lattice relaxation rates of the 23Na nuclei indicate the presence of fast Na+ ion diffusion in the studied compound. At T<490 K, diffusion occurs by means of Na+ ion jumps exclusively through the sublattice of Na3−Na5 positions, whereas Na1 and Na2 become involved in the diffusion processes (through chemical exchange with the Na3−Na5 sublattice) only at higher temperatures.

13.

Luminescence properties upgrading via the structure and cation changing in AgxEu(2–x)/3WO4 and AgxGd(2–x)/3–0.3Eu0.3WO4 / V.A. Morozov, D. Batuk, M. Batuk, O.M. Basovich, E.G. Khaikina, D.V. Deyneko, B.I. Lazoryak, I.I. Leonidov, A.M. Abakumov, J. Hadermann // Chem. Mater. – 2017. – Vol. 29. – P. 8811–8823. https://doi.org/10.1021/acs.chemmater.7b03155 (IF - 9.466; Q1).

https://pubs.acs.org/doi/pdf/10.1021/acs.chemmater.7b03155

The creation and ordering of A-cation vacancies and the effect of cation substitutions in the scheelite-type framework are investigated as a factor for controlling the scheelite-type structure and luminescence properties. AgxEu3+(2−x)/3□(1−2x)/3WO4 and AgxGd(2−x)/3−0.3Eu3+ 0.3□(1−2x)/3WO4 (x = 0.5−0) scheelite-type phases were synthesized by a solid state method, and their structures were investigated using a combination of transmission electron microscopy techniques and powder synchrotron X-ray diffraction. Transmission electron microscopy also revealed the (3 + 1)D incommensurately modulated character of AgxEu3+(2−x)/3□(1−2x)/3WO4 (x = 0.286, 0.2) phases. The crystal

structures of the scheelite-based AgxEu3+(2−x)/3□(1−2x)/3WO4 (x = 0.5, 0.286, 0.2) red phosphors have been refined from high resolution synchrotron powder X-ray diffraction data. The luminescence properties of all phases under near-ultraviolet (n-UV) light have been investigated. The excitation spectra of AgxEu3+(2−x)/3□(1−2x)/3WO4 (x = 0.5, 0.286,

0.2) phosphors show the strongest absorption at 395 nm, which matches well with the commercially available n-UV-emitting GaN-based LED chip. The e