RAS Kurnakov Institute of General and Inorganic Chemistry

Moscow, Russia

RAS Kurnakov Institute of General and Inorganic Chemistry

Moscow, Russia
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Kol'tsova T.N.,RAS Kurnakov Institute of General and Inorganic Chemistry
Inorganic Materials | Year: 2017

This paper presents a three-dimensional geometric analysis of the homogeneity regions of gismondine, cymrite, anorthite, and celsian solid solutions with the use of two composition tetrahedra: AO–BO0.5–AlO1.5–SiO2 and AO–AlO1.5–SiO2–H2O (where A = alkaline-earth element and B = alkali element). The main general aspects of the extension of the homogeneity regions are elucidated. The position of the homogeneity regions in the composition tetrahedra suggests that increasing the percentage of SiO2 should lead to a gismondine–cowlesite phase transition and that a few phase transitions should be expected in the course of gismondine dehydration, which will lead to the formation of a solid solution with the anorthite structure after all of the water will be removed. © 2017, Pleiades Publishing, Ltd.


Kostanyan A.E.,RAS Kurnakov Institute of General and Inorganic Chemistry
Journal of Chromatography A | Year: 2017

The method of closed-loop recycling counter-current chromatography (CLR CCC) with multiple sample injection is proposed for the separation and concentration of a target component of a mixture. Analytical expressions are developed to describe the CLR CCC separations with multiple sample injection. Several possible implementations of multiple feed injection are analyzed: the feed is injected in each cycle, after every two cycles and in an arbitrary cycle. The application of different modes of multiple feed injection to the separation and concentration of the target component from binary mixtures by CLR CCC has been studied. The results of this study indicate that it is possible to achieve simultaneously both the separation and concentration of the target component. © 2017 Elsevier B.V.


Buchachenko A.L.,RAS Institute of Problems of Chemical Physics | Kuznetsov D.A.,RAS Semenov Institute of Chemical Physics | Breslavskaya N.N.,RAS Kurnakov Institute of General and Inorganic Chemistry
Chemical Reviews | Year: 2012

A study was conducted to demonstrate that an isotope provided significant information about chemistry of enzymatic ATP synthesis. Isotope-containing MgCl 2, CaCl 2, and ZnCl 2 samples were obtained using the treatment of magnesium, calcium, and zinc oxides with analytically pure HCl. Monomeric creatine kinase was purified from Vipera xanthia venom, phosphoglycerate kinase was purified from pig skeletal muscle, and pyruvate kinase was isolated and purified from rabbit muscles. The catalytic activities of enzymes were measured conventionally as the amounts of labeled ATP formed in the presence of [ 32P]phosphocreatine, [ 32P] phosphoglycerate, or [ 32P]phosphopyruvate in 1minute at optimal incubation conditions and corrected to 1 mg of tested pure enzyme. The original electrophoretic technique was employed for loading or substitution of magnesium, calcium, and zinc ions into the enzyme active sites.


Kostanyan A.E.,RAS Kurnakov Institute of General and Inorganic Chemistry
Journal of Chromatography A | Year: 2014

The multiple dual mode (MDM) counter-current chromatography (CCC) separation consists of a succession of two isocratic counter-current steps and is carried out in series alternating between normal phase and reversed phase operation. The performance of the MDM technique can be improved by the sample re-injection between each of the dual-mode steps. The objective of this work was to develop analytical expressions to describe the MDM CCC with periodic sample injection, which can be used to simulate these processes and select optimal operating conditions for the separation of a given feed mixture. Two possible methods of the MDM separation with periodic sample injection are considered: 1 - steady-state separation: the duration of the flow periods of the phases is kept constant for all the cycles and the steady-state regime is achieved after a certain number of cycles. 2 - non-steady-state separation with variable duration of phase elution steps. It is shown that proper selection of the duration of phase flow times allows to reach complete separation of solutes in continuous steady-state operation mode even in a low efficiency column. This mode of operation provides both high productivity and high resolution. The non-steady-state method with variable duration of phase elution steps offers several options to split a mixture into groups of compounds and/or concentrate target compounds. © 2014 Elsevier B.V.


Sergienko V.S.,RAS Kurnakov Institute of General and Inorganic Chemistry
Russian Journal of Inorganic Chemistry | Year: 2014

Some structural features of mononuclear octahedral rhenium(V) oxo complexes with oxygen atoms of hydroxo ligands in trans-positions to multiply bonded oxo ligands are considered. The complexes contain monodentate inorganic or organic ligands or bi- and tetradentate organic ligands in the equatorial plane. © 2014 Pleiades Publishing, Ltd.


Sergienko V.S.,RAS Kurnakov Institute of General and Inorganic Chemistry
Russian Journal of Inorganic Chemistry | Year: 2014

Structural features of mononuclear octahedral rhenium(V) monooxo complexes with sulfur and hydrogen atoms in the trans positions to the multiply bonded oxo ligands are reviewed in the paper. © 2014 Pleiades Publishing, Ltd.


Kostanyan A.E.,RAS Kurnakov Institute of General and Inorganic Chemistry
Journal of Chromatography A | Year: 2011

Basing on the perfect replacement approach the equilibrium cell model is developed to describe the separation process in elution-extrusion counter-current chromatography (EECCC). As is known, EECCC consists of three steps: classical elution, sweeping elution, and extrusion. The perfect replacement approach means that during sweeping elution step, the mobile phase contained in the column moves and interacts with the " old" stationary phase in the same mode as during the classical elution step; the " new" and " old" stationary phases do not mix; and after the contacting with the mobile phase the concentration of solutes in the " old" stationary phase remains constant and this stationary phase volume is pushed ahead to the exit of the column. Equations are presented allowing the simulation of the chromatogram of solutes eluted from the column with the mobile phase during the elution period and the chromatogram of solutes pushed out of the column with the stationary phase during the extrusion period of EECCC. These equations can help to choose the optimal conditions for conducting elution-extrusion counter-current chromatography. © 2011 Elsevier B.V.


Shirobokov O.G.,Brock University | Kuzmina L.G.,RAS Kurnakov Institute of General and Inorganic Chemistry | Nikonov G.I.,Brock University
Journal of the American Chemical Society | Year: 2011

A 1:1:1 reaction between complex (Tp)(ArN=)Mo(H)(PMe 3) (3), silane PhSiD 3, and carbonyl substrate established that hydrosilylation catalyzed by 3 is not accompanied by deuterium incorporation into the hydride position of the catalyst, thus ruling out the conventional hydride mechanism based on carbonyl insertion into the M-H bond. An analogous result was observed for the catalysis by (O=)(PhMe 2SiO)Re(PPh 3) 2(I)(H) and (Ph 3PCuH) 6. © 2011 American Chemical Society.


Sergienko V.S.,RAS Kurnakov Institute of General and Inorganic Chemistry
Russian Journal of Inorganic Chemistry | Year: 2015

Some structural features of mononuclear octahedral rhenium(V) oxo complexes with oxygen atoms of propoxo ligands O(Pr-iso)- in trans-positions to multiply bonded oxo ligands are considered. The complexes contain monodentate inorganic or organic ligands or bi- and tetradentate organic ligands in the equatorial plane. Re-O(OPr) trans bonds, as well as the other bonds with (ORalkoxo) trans alkoxo ligands (R = Me, Et), are considerably shortened, instead of being elongated, due to the structural manifestation of the trans-effect of multiply bonded oxo ligands. This is explained by that these Re-O(ORalkoxo) bonds also have an increased multiplicity; that is, d 2 rhenium(V) monooxomonoalkoxo complexes should be considered as pseudo-dioxo Re(=O)(=ORalkoxo) compounds. © 2015 Pleiades Publishing, Ltd.


Kostanyan A.E.,RAS Kurnakov Institute of General and Inorganic Chemistry
Journal of Chromatography A | Year: 2012

The cell model theory of CCC is extended to develop analytical solutions for various sample loading conditions (non-impulse loading with separate feed stream and with the mobile phase flow, impulse and non-impulse periodic loading). Equations are presented allowing the simulation of the chromatograms for various sample loading conditions. These equations can help to predict the influence of sample loading conditions on the separation of a given feed mixture and select a suitable compromise between the productivity and the resolution in the isocratic preparative and production CCC separations. It is shown that: when the sample loading time is about 2% of the mean residence time, the effect of loading time can be neglected; the loading time about 20% of the mean residence time seems to be quite acceptable; proper selection of the conditions for the sample loading can allow increasing the productivity by an order of magnitude ensuring, a desirable separation. © 2012 Elsevier B.V.

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