Z. Abbas1, B. Ahma2, S. Ali1 1Department of Mathematics, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan 2Department of Mathematics, Faculty of Basic Sciences, University of Wah, Wah, Pakistan
Keywords: неньютоновская жидкость, магнитогидродинамическое течение, полупористый канал, химическая реакция, non-Newtonian fluid, MHD flow, semi-porous channel, chemical reaction
An analysis of a second-grade fluid in a semi-porous channel in the presence of a chemical reaction is carried out to study the effects of mass transfer and magnetohydrodynamics. The upper wall of the channel is porous, while the lower wall is impermeable. The basic governing flow equations are transformed into a set of nonlinear ordinary differential equations by means of a similarity transformation. An approximate analytical solution of nonlinear differential equations is constructed by using the homotopy analysis method. The features of the flow and concentration fields are analyzed for various problem parameters. Numerical values of the skin friction coefficient and the rate of mass transfer at the wall are found.
E. Shahsavani1, N. Feizi2, V. Eigner3, M. Dusek3, A.D. Khalaji4 1Payame Noor University, Mashhad, Iran 2Institute of Chemical Technology, Prague, Czech Republic 3Institute of Physics of the ASCR, Prague 8, Czech Republic 4Golestan University, Gorgan, Iran
Keywords: copper(I), thiosemicarbazone, crystal structure, single crystal
In this paper, we report the preparation of a four-coordinated copper(I) thiosemicarbazone complex [CuI(PPh
3)(catsc)] from the reaction of PPh
3 and catsc (3-phenylpropenalthiosemicarbazone) with CuI. The synthesized complex is characterized by elemental analyses (CHNS) and FT-IR spectroscopy. The crystal structure of [CuI(PPh
3)(catsc)] is investigated by single crystal X-ray diffraction. The catsc coordinates to the copper(I) ion as a bidentate ligand
via the N and S atoms. The complex has a distorted tetrahedral coordination geometry.
The crystal structures of two
N-heterocyclic carbene (NHC)-palladacycles are determined by single crystal X-ray diffraction. The intermolecular C-H⋯Cl hydrogen bonds and π⋯π interactions are found in the crystals.
A. Yu. Ledneva1, S. B. Artemkina1,2, D. A. Piryazev1, V. E. Fedorov1,2 1Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 2Novosibirsk National Research State University, Novosibirsk, Russia
Keywords: молибден, ацетилацетон, синтез, кристаллическая структура, термический анализ, molybdenum, acetylacetone, synthesis, crystal structure, thermal analysis
A method for the synthesis of the Mo(acac)
3 complex is proposed and its crystal structure is determined by single crystal X-ray diffraction. Space group P 2
1/ c , a = 19.7538(5) Å, b = 7.4821(2) Å, c = 34.6190(8) Å, b = 96.8055(12)°, V = 5080.6(2) Å
3, Z = 12. The compound is studied by the thermogravimetric analysis, and MoO
3 is shown to be the result of its decomposition.
A. Yu. Ledneva1, A. V. Virovets1,2, N. G. Naumov1,2 1Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 2Novosibirsk National Research State University, Novosibirsk, Russia
Keywords: синтез, рений, октаэдрический кластер, кадмий, синтез, топологическая кристаллохимия, водородная связь, synthesis, rhenium, octahedral cluster, cadmium, synthesis, topological crystal chemistry, hydrogen bond
By single crystal X-ray diffraction, the structure of a new compound based on octahedral mixed-ligand anionic cluster complexes of rhenium and cadmium(II) cations is determined: K
0.4Cs
0.6{Cd(H
2O)
2Re
6S
8(CN)
4(OH)(H
2O)}·8H
2O (1). The compound has a framework structure with a pts (platinum sulfide) topology. The cluster anions are additionally chained together by strong OH…H
2O hydrogen bonds between the terminal ligands of neighboring clusters; the O…O distance is 2.464 Å.
Copper(I) π complexes with 2-allylamino-5-phenyl-1,3,4-thiadiazole (C11H11N3S) of the composition [CuCl(C11H11N3S)] (1) and [Cu(C11H11N3S)(H2O)(CH3CN)]2SiF6×2CH3CN (2) are obtained by alternating current electrochemical synthesis and studied by single crystal X-ray diffraction. In both structures, the L molecule coordinates to the Cu(I) atom by the C=C bond of the allyl group and the N3 atom of the 1,3,4-thiadiazole core. In 1, the coordination environment of the metal atom is completed to trigonal by one terminal halogen atom, and in 2, it is completed to the tetrahedral environment by the acetonitrile N atom and the O atom of a water molecule. The bridging function of the organic ligand in 1 leads to the formation of coordination chains {CuCl(C11H11N3S)}¥, whereas cationic p complex 2 is formed from monomeric {Cu(C11H11N3S)(H2O)(CH3CN)}+ cations and anions. A branched system of O-H⋯F, O-H⋯N, and N-H⋯F hydrogen bonds in compound 2 forms hydrogen-bonded layers.
M. S. Tarasenko1, N. G. Naumov1,2, N. V. Kuratieva1,2 1Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 2Novosibirsk National Research State University, Novosibirsk, Russia
Keywords: рений, октаэдрический кластер, РЗЭ, синтез, комплексные соединения, кристаллическая структура, rhenium, octahedral cluster, rare earth elements (REE), synthesis, complex compounds, crystal structure
Two new Cs5[{Ln(H2O)4(C2H6O)}{Re6Se8(CN)6}2]×2H2O (Ln = La, Nd) compounds are obtained by the interaction of aqueous Cs3KRe6S8(CN)6 and LnCl3 solutions in the presence of ethanol. These compounds are isostructural, and crystallize in the tetragonal crystal system (space group P 4/ ncc ) with the following unit cell parameters: a = 17.9102 Å, c = 19.6694 Å for La, and a = 17.8846 Å, c = 19.6425 Å for Nd. The structure of the compounds consists of corrugated [{Ln(H2O)4(C2H6O)}{Re6Se8(CN)6}2]5-layers. Cesium cations compensating the negative charge are located in both cavities of the corrugated layer and between the layers.
R. V. Pushkarev1, N. I. Fainer1, K. K. Maurya2 1Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 2National Physical Laboratory, 110012, New Delhi, India
Keywords: рентгеновская дифракция в геометрии скользящего падения пучка, пленки состава SiCFe и SiCNFe, ферроцен, grazing incidence X-ray diffraction, films with the compositions SiCFe and SiCNFe, ferrocene
Films of various composition are synthesized by chemical vapor deposition under low pressure using the thermal decomposition of the following initial gas mixtures: ferrocene Fe(C5H5)2 and helium; ferrocene, tris(diethylamino)silane [(C2H5)2N]3SiH (TDEAS) and helium; ferrocene, 1,1,1,3,3,3-hexamethyldisilazane [(CH3)3Si]2NH (HMDS), and helium. The chemical composition of the films obtained is analyzed by FTIR and Raman spectroscopies. The phase composition of the films is studied by grazing incidence X-ray diffraction (GIXRD). It is determined that the films grown from the gas mixtures of organiosilicon compounds (TDEAS or HMDS), ferrocene, and helium have the same chemical and phase composition (SiCxNyFez), while the films obtained from the mixture of ferrocene and helium have another composition (SiCxFey).
Yu. M. Litvinova1, N. V. Kuratieva1, Ya. M. Gayfulin1, Yu. V. Mironov1,2 1Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia 2Novosibirsk National Research State University, Novosibirsk, Russia
Keywords: рений, кубановый кластерный комплекс, кристаллическая структура, rhenium, cubane cluster complex, crystal structure
A tetrahedral cluster complex of rhenium with the composition (PhenH)4[Re4Te4(CN)12]×4H2O (1) is obtained and structurally characterized. The structure of the salt is determined by single crystal X-ray diffraction. The compound crystallizes in the orthorhombic space group Fdd 2, a = 23.1780(7) Å, b = 50.009(2) Å, c = 11.4274(3) Å, V = 13245.6(7) Å3.
