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Dive into the research topics where E. P. Turevskaya is active.

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Featured researches published by E. P. Turevskaya.


Polyhedron | 1995

Bimetallic alkoxides of niobium

E. P. Turevskaya; N. Ya. Turova; A.V. Korolev; A.I. Yanovsky; Yu. T. Struchkov

Abstract The formation of the I–III group metal alkoxoniobates has been studied using the physicochemical analysis method, namely the investigation of solubility isotherms for the M(OR) n -Nb(OR) 5 -ROH systems (M = Li, Ba, Sc, La; R = 2Et, Pr i ). The crystallization of the following complexes has been observed: LiNb(OEt) 6 ( I ), [LiNbO(OEt) 4 (EtOH)] 2 ( II ), [BaNbO(OEt) 5 (EtOH) 1,5 ] 4 ( III ), BaNb 2 (OPr i ) 12 (Pr i OH) 2 ( IV ) and LaNb 2 (OPr i ) 13 ( V ). It has been found that the bimetallic isopropoxide of Sc and Nb does not exist in the solid state. The oxo complexes II and III are formed on storage (or more rapidly on refluxing) of the solutions of non-oxo compounds in alcohols in the presence of dry air and are, in fact, the products of these compounds oxidation by oxygen. The structure of II is built of dimeric molecules with the metal-oxygen coer analogous to that of Ti 4 (OMe) 16 . The molecule of III is constructed around the [Ba 4 O 4 ] cubane-like unit, whose oxygen vertices are occupied by the oxo atoms of NbO(OEt) 5 octahedra. The structures of the molecules of IV, V and recently studied Nb(OPr i ) 5 are based on the common motif featuring the M 2 O 2 four-membered cycles in edge sharing octahedra. All the observed [NbMNb] units are non-linear, the molecule of V being asymmetric, for the central [LaO 6 ] octahedron is sharing simultaneously an edge with one [NbO 6 ] octahedron and a face with the other. The conditions leading to the formation of oxo groups and the influence of the latter on the complexation process have been discussed. The literature data on the existence of 3 d transition metals alkoxoniobates have not been confirmed. It has been found that interaction of Nb and Co or Ni isopropoxides takes place only due to preliminary microhydrolysis or pyrolysis and leads to formation of oxoalkoxoniobates.


Journal of Sol-Gel Science and Technology | 1999

Sol-Gel Derived Ferroelectric Thin Films: Avenues for Control of Microstructural and Electric Properties

K.A. Vorotilov; M.I. Yanovskaya; E. P. Turevskaya; A.S. Sigov

The paper presents short review of the works performed during the last few years in the field of the alkoxy-derived ferroelectric films. PZT films were prepared using titanium and zirconium alkoxides and Pb(CH3COO)2· 2H2O as precursors. Different way of lead acetate dehydration and the impact of lead excess in the precursor solutions on the properties of the PZT films are discussed. Trimetallic alkoxide systems Bi(OR)3-Ta(OR)5-ROH (R = Me, Et or i Pr) were studied as precursors for preparation of SrBi2Ta2O9 films. Films prepared from these solutions and annealed at the temperature between 700 and 750°C demonstrated the remanent polarization Pr* − P^r = 7–9 μC/cm2. Ba1-xSrxTiO3 films we applied from modified alkoxide solutions. Decomposition of the organic phase in the course of thermal treatment of the films is studied by IR-spectroscopy. The dependence of the dielectric permittivity of the films via the annealing temperature is reported. Preparation of LiNbO3, SrZr0.2Ti0.8O3, Zr0.8Sn0.2TiO4 is briefly discussed.


Polyhedron | 1997

The structure of the crystal solvate of magnesium methoxide with methanol, Mg(OMe)2·3.5MeOH

Z. A. Starikova; A.I. Yanovsky; E. P. Turevskaya; N. Ya. Turova

Abstract The X-ray diffraction study of the crystals deposited from the solution obtained by the reaction of magnesium with methanol allowed the formulation of the product as Mg(OMe)2·3.5MeOH (I). Its structure is built of the residues of four types, namely cubane [Mg4(μ3-OR)4(OR)4(ROH)8] neutral molecules, [Mg4(μ3-OR)4 (OR)2(ROH)10]2+ cations, [(RO)2H]− anions (R = Me) and eight crystallographically independent non-coordinated solvating methanol molecules. All residues are linked into a three-dimensional framework by means of a complicated hydrogen-bonding system. The crystal structure provides the basis for discussion of the possible mechanism of desolvation of I.


Journal of The Chemical Society, Chemical Communications | 1993

Synthesis, crystal and molecular structure of calcium oxo ethoxide, [Ca6(µ4-O)2(µ3-OEt)4(OEt)4]·14EtOH

Nataliya Turova; E. P. Turevskaya; V. G. Kessler; Alexander I. Yanovsky; Yuri T. Struchkov

The hexanuclear complex of calcium oxo ethoxide ethanol solvate, [Ca6O2(OEt)8]·14EtOH 1 has been isolated after the prolonged refluxing of an ethanol solution of calcium ethoxide in the presence of the oxygen in air and studied by X-ray diffraction; the metal-oxygen framework is built of two [Ca4O4] cubes sharing a common [Ca2O2] face, which involves both oxo groups.


Journal of Materials Science | 1988

Formation of LiNbO3 powders and thin-films by hydrolysis of metal alkoxides

M. I. Yanovskaya; E. P. Turevskaya; A. P. Leonov; Sergey A. Ivanov; N. V. Kolganova; S. Yu. Stefanovich; N. Ya. Turova; Yu. N. Venevtsev

Crystalline LiNbO3 was prepared by simultaneous hydrolysis of lithium and niobium alkoxides (in the mole ratio Li : Nb = 1 :1) followed by heat treatment. Crystallization of LiNbO3 occurs in a wide temperature region, 350 to 700° C, directly from an amorphous hydrolysis product containing residual alkoxy and hydroxy groups. Heat treatment at 700° C results in the formation of fully crystalline LiNbO3 powder with completely formed ferroelectric properties. Hydrolysis of metal alkoxide solutions is successfully used to obtain high-quality LiNbO3 crystalline thin films.


Polyhedron | 1998

PHYSICOCHEMICAL APPROACH TO THE STUDIES OF METAL ALKOXIDES

N. Ya. Turova; E. P. Turevskaya; M. I. Yanovskaya; A.I. Yanovsky; V. G. Kessler; D.E. Tcheboukov

Abstract The review provides a description of main events in the development of chemistry of metal alkoxides in Russian and summarizes the results obtained by the authors. The studies of solubility and vapor pressure in the M(OR)n-ROH (R  Li, Mg, Ca, Sr, Ba, Tl) systems permitted the determination of the composition of the solvates formed and the optimization of the isolation conditions for distinct derivatives. The electrochemical synthetic approach to the alkoxide and 2-methoxyethoxide derivatives of III–VIII Group elements has been elaborated. Improvement of the MCln with NaOR metathesis conditions led to practically quantitative yields of alkoxides. The examples of the structures of polynuclear oxoalkoxides, earlier erroneously considered to be orthoderivatives, i.e. ‘M(OR)n’, are given. It has been stated that among the alkoxoderivatives of Zr and Hf these are only M(OC2H4OMe)4 and M(OR)4·ROH (RPri, Bui) that exist as individual compounds, while the samples of those with different R contain oxocomplexes of M3O(OR)10 and M4O(OR)14 composition. The questions connected with the origin of oxogroups in the molecules of alkoxides and their influence on the properties of the samples are discussed. The irreproducibility of the physicochemical constants for the samples (physical state, melting points, solubility in alcohols, intensity of coloration) is caused by different ‘chemical’ (synthetic procedures, isolation conditions) and the thermal prehistory and storage times; it originates from the difference in their molecular composition (different fractions of different types of oligomeric and polymeric [M(OR)n]m and MxOy(OR)z aggregates). Formation of bimetallic alkoxides is studied using the plotting to 20°C solubility isotherms in M(OR)n− M′(OR)m-Solvent systems. Different kinds of systems are considered and the composition and structure of bimetallic complexes and oxocomplexes, originating from their decomposition, are described. Decomposition of alkoxomolybdates and -tungstates in solution may result in crystallization of complex oxides as the final products. The example of MTiO3 (MMg, Ba) oxide preparation is discussed as most illustratively demonstrating the need in studies of metal alkoxides interaction in solution for the optimization of synthesis of oxides by the sol-gel technique.


Russian Chemical Bulletin | 1995

The alkoxides of zirconium and hafnium: direct electrochemical synthesis and mass-spectral study. Do “M(OR)4”, where M=Zr, Hf, Sn, really exist?

E. P. Turevskaya; N. I. Kozlova; N. Ya. Turova; A. L. Belokon; D. V. Berdyev; V. G. Kessler; Yu. K. Grishin

The direct electrochemical synthesis of zirconium (1a) and hafnium (1b) alkoxides, M(OPri)4·PriOH, Zr(OBui)4·BuiOH (4a) and M(OR)4, where R=Et (2a,b), Bun (3a), Bus (5a), C2H4OMe (6a,b) has been carried out by anodic oxidation of metals in anhydrous alcohols in the presence of LiCl as a conductive additive to give quantitative yields. The solubility polytherms and dissociation pressure of1a,b have been investigated. It has been proved by means of chemical analysis, X-ray powder, and IR spectral studies that the desolvation of 1a,b and Sn(OPri)4·PriOH (1c) is accompanied by the formation of amorphous oxocompounds M3O(OPri)10. On the basis of1H NMR data it has been proved that the structure of the latter is analogous to that of known triangular cluster molecules M3(μ3-O)(μ3-OR)(μ-OR)3(OR)6, where M=Mo, W, U. Mass-spectral data and the determined physicochemical characteristics of1–5 permit to conclude that the samples of composition M(OR)4, where M=Zr, Hf, and2,3,5 contain tri- and tetranuclear oxocomplexes M3O(OR)10 and M4O(OR)14 respectively, along with Zr(OR)4 oligomers of different molecular complexity.


Ferroelectrics | 1991

BaTiO3 films on silicon wafers from metal alkoxides

K. A. Vorotilov; E. V. Orlova; V. I. Petrovsky; M. I. Yanovskaja; S. A. Ivanov; E. P. Turevskaya; N. Ya. Turova

Barium titanate films on silicon wafers have been obtained by spinning of the alkoxide solution in butyl alcohol. Application and crystallization conditions have been studied. The best characteristics were achieved for the samples with a Si3N4 protective sublayer annealed at 700°C; formation of the ferroelectric tetrahedral phase occurs only after annealing of the films above 900°C.


Polyhedron | 2000

Scandium alkoxides: the first mixed-ligand alkoxides containing the [M5O(OR)8] core, scandium alkoxoaluminates

E. P. Turevskaya; A. I. Belokon; Z. A. Starikova; Alexander I. Yanovsky; Evgeniy N Kiruschenkov; Nataliya Turova

Abstract The electrochemical synthesis of Sc(OMe)3 (1), Sc(OEt)3 (2) and Sc5O(OPri)13 (3) was carried out via anodic oxidation of scandium metal in aliphatic alcohols. X-ray single crystal study showed 3 to be analogous to the known isopropoxides of Y, Er, Yb and In. The interaction of 3 with excess ROH (R=Me, Et, Bun, Bus, But) gives non-volatile amorphous 1, 2 and Sc(OBun)3 (4), and volatile Sc5O(OBus)13 (5) and Sc5O(OPri)8(OBut)5 (6). Oxoalkoxides Sc5O(OPri)8(OR)5 (R=Bun 7, Me 8) were obtained on reaction of 3 with n-ROH in 1:5 ratio. The mass spectral study shows 5 is an individual compound, whereas 6–8 in the gas phase consist of a number of aggregates with different extents of substitution for OPri groups, Sc5O(OR)n(OPri)13−n: for R=But n≤5, for R=Bun n≤8, and for R=Me n≤12. The maximal intensity in the spectrum of 6 is observed for Sc5O(OPri)10(OBut)2+, and in the spectra of 7 and 8 for Sc5O(OPri)12−n(OBun)n+, n=4, 5, and Sc5O(OPri)9(OMe)3+ respectively. The presence of the Sc5O(OMe)12+ ion in the spectrum of 8 indicates the possibility of replacing all the OPri in the pentanuclear core and demonstrates the existence of a ‘volatile scandium methoxide’ in the gas phase. Study of the complex formation of Sc(OR)3 with Al(OR)3 has shown that 2 and 4 form volatile Sc[Al(OR)4]3, R=Et 9, Bun 10, while 3 does not react under these conditions. Sc[Al(OPri)4]3 (11) can be obtained only on exchange reaction of ScCl3 with KAl(OPri)4. The results obtained indicate rather high stability of the [Sc5O(OR)8] core for primary and secondary R.


Inorganic Chemistry Communications | 2002

The structure of the bismuth ethoxide ethanol solvate. A new structural type for octameric alkoxides

Vadim G. Kessler; N. Ya. Turova; E. P. Turevskaya

Abstract The octanuclear complex of bismuth ethoxide ethanol solvate, [Bi(OEt)3]8·(7+x)EtOH (1) has been isolated on crystallization from the ethanol solution of the products from the BiCl3 metathesis with NaOEt. The molecule of 1 is a [Bi8] cycle with a crown shape (analogous to that of S8 in the elementary sulfur), and is built up of seven [Bi(μ-OEt)4(OEt)] tetragonal pyramids and one [Bi(μ-OEt)4(OEt)(EtOH)] octahedron. The ring is surrounded by EtOH molecules forming hydrogen bonds with the terminal OEt-groups.

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A. I. Yanovskii

A. N. Nesmeyanov Institute of Organoelement Compounds

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Yu. T. Struchkov

A. N. Nesmeyanov Institute of Organoelement Compounds

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Z. A. Starikova

A. N. Nesmeyanov Institute of Organoelement Compounds

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A.I. Yanovsky

A. N. Nesmeyanov Institute of Organoelement Compounds

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A. I. Belokon

A. N. Nesmeyanov Institute of Organoelement Compounds

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