Kara Kalpak State University

Nukus, Uzbekistan

Kara Kalpak State University

Nukus, Uzbekistan
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Abdireymov K.B.,Academy of Sciences of Uzbekistan | Mukhamedov N.S.,Academy of Sciences of Uzbekistan | Okmanov R.Ya.,Academy of Sciences of Uzbekistan | Ayimbetov M.J.,Kara Kalpak State University | Shakhidoyatov Kh.M.,Academy of Sciences of Uzbekistan
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

The title compound, C17H18N2O 2S, was synthesized by aryl-sulfonyl-ation of 1-hydroxy-methyl-1H- benzimidazole in the presence of triethylamine. The benzimidazole and benzene rings form a dihedral angle of 84.1 (1)°. The tert-butyl group was treated as rotationally disordered over two orientations in a 0.51 (2):0.49 (2) ratio. In the crystal, weak intermolecular C - H⋯O hydrogen bonds link the molecules into chains propagating in [010].


Abdireymov K.B.,Academy of Sciences of Uzbekistan | Mukhamedov N.S.,Academy of Sciences of Uzbekistan | Okmanov R.Y.,Academy of Sciences of Uzbekistan | Ayimbetov M.J.,Kara Kalpak State University | Tashkhodjaev B.,Academy of Sciences of Uzbekistan
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

The title compound, 0.759C19H21ClN2O 2S·0.241C19H21ClN2O 2S, was synthesized by arylsulfonylation of 2-n-butyl-5-chloro-1H- benzimidazole in the presence of triethylamine. The crystal structure is composed of two molecules, 2-n-butyl-6-chloro-1-(2,4-dimethylphenylsulfonyl)-1H- benzimidazole and 1-(2,4-dimethylphenyl-sulfon-yl)-2-n-butyl-5-chloro-1H-benz- imidazole, in the refined ratio of 0.759 (4):0.241 (4) disordered at the same position in the unit cell. The molecule has three essentially planar fragments viz. benzimidazole, dimethylbenzene and n-butyl (r.m.s. deviations of 0.009, 0.024 and 0.003 Å, respectively). The angle between the benzimidazole and dimethyl-benzene fragments is 86.0 (1)°. In the crystal, pairs of intermolecular C-H⋯π interactions form centrosymmetrical dimers, which are linked by weak intermolecular C-H⋯O hydrogen bonds.


Dikusar E.A.,National Academy of Sciences of Belarus | Potkin V.I.,National Academy of Sciences of Belarus | Kozlov N.G.,National Academy of Sciences of Belarus | Stepin S.G.,Vitebsk State Technological University | Tlegenov R.T.,Kara Kalpak State University
Russian Journal of General Chemistry | Year: 2012

Condensation of p-phenetidine with the substituted aromatic benzaldehydes in methanol results in (E)-4-methylethoxyphenyliminoaryl derivatives. The latter react with gaseous hydrogen chloride in diethyl ether to form 4-ethoxymethylphenyliminoaryl hydrochlorides. © 2012 Pleiades Publishing, Ltd.


Pogrebnjak A.D.,Sumy State University | Pshyk A.V.,Sumy State University | Beresnev V.M.,University of Kharkiv | Zhollybekov B.R.,Sumy State University | Zhollybekov B.R.,Kara Kalpak State University
Journal of Friction and Wear | Year: 2014

A review of the experimental results of studying multicomponent nanocomposite protective coatings of various chemical compositions (TiAlCrYN, TiAlSiBN, TiAlSiCuN, CrTiAlSiN, and TiHfSiN/NbN/Al2O3) developed in recent years is presented. An analysis of the available data on the chemical composition, hardness, oxidation resistance, thermal stability, friction, wear, adhesion strength, and corrosion properties of nanocomposite coatings with high physicomechanical characteristics is carried out. The application of the nanocomposite coatings in industry is exemplified using the performance characteristics of drills made from a high-speed steel covered with a multicomponent protective coating. © 2014 Allerton Press, Inc.


Parchinskii P.B.,National Academy of Uzbekistan | Ligai L.G.,National Academy of Uzbekistan | Nasirov A.A.,National Academy of Uzbekistan | Allambergenov M.M.,Kara Kalpak State University | Ismailov K.A.,Kara Kalpak State University
Surface Engineering and Applied Electrochemistry | Year: 2012

The generation properties of the silicon - lead-borosilicate glass interface are studied by the method of pulsed MIS capacitor. It was shown that surface generation current nomonotonicly depends on temperature. This nomonotonic dependence may be the result of tunnel and tunnel activated current from traps states in lead-borosilicate glasses localized close to the silicon-glass interface which contributes to the total surface generation current and becomes dominant as the temperature is lowered. © 2012 Allerton Press, Inc.

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