Detrifluoroacetylation of Ethyl 2-(Ethoxymethylene)- 4,4,4-Trifluoro-3-Oxobutanoate

This work was financially supported by the Council for grants of the President of Russian Federation (grant no. MK-1453.2019.3)

Polynuclear Metallic Architectures Based on Fluorinated Functionalized Diketonates

K.Y.S. is thankful to the Council for grants of the President of Russian Federation (grant no. 1453.2019.3)

Heterometallic Molecular Architectures Based on Fluorinated β-Diketone Ligands

This review summarizes the data on the synthesis of coordination compounds containing two or more different metal ions based on fluorinated β-diketonates. Heterometallic systems are of high interest in terms of their potential use in catalysis, medicine and diagnostics, as well as in the development of effective sensor devices and functional materials. Having a rich history in coordination chemistry, fluorinated β-diketones are well-known ligands generating a wide variety of heterometallic complexes. In this context, we focused on both the synthetic approaches to β-dicarbonyl ligands with additional coordination centers and their possible transformations in complexation reactions. The review describes bi- and polynuclear structures in which β-diketones are the key building blocks in the formation of a heterometallic framework, including the examples of both homo- and heteroleptic complexes. © 2022 by the authors.Russian Academy of Sciences, РАН, (AAAA-A19-119011290117-6)This work was carried out in the framework of the basic theme of the Russian Academy of Sciences (state registration № AAAA-A19-119011290117-6)

Novel method of silicon synthesis by CVD

Silicon fibers were synthesized by a novel CVD method including in the interaction of aluminum monofluoride with silicon oxide, the final product containing nanofibers in an amount of 15 wt. %. The possibility of selective reduction of silicon oxide from the chamotte refractory plate was also demonstrated. Si was characterized by SEM and XRD. Thermodynamics and mechanism of silicon fiber formation were also considered. © 2019 Author(s)

Expanding 1,2,4-triketone Toolbox for use as Aluorinated Building Blocks in the Synthesis of Pyrazoles, Pyridazinones and β-diketohydrazones

Fluorinated lithium β-diketonates bearing a methyl acetal group behave in the condensation reactions with hydrazines as trielectrophilic building blocks for the preparation of pyrazoles, pyridazinones and β-diketohydrazones. For the first time, solvent-induced regioisomeric and heterocyclic ring size-controlled formation was observed for 1,2,4-triketone analogues. Fluoroalkylated acetyl NH-pyrazoles or substituted 5-RF-pyrazoles were obtained from the acid-catalyzed cyclocondensation of lithium β-diketonates with (aryl)hydrazines in ethanol. In methanol solvent acetyl-containing 3-CF3-pyrazoles were isolated because of inverse nucleophilic attack of arylhydrazines. The use of aprotic acetonitrile in the condensation resulted in regioselective trifluorinated pyridazinones and fluorinated β-diketohydrazones formation via initial acetal fragment interaction with N,N-dinucleophile. © 2021 Elsevier B.V.This work carried out in the framework of the basic theme of the Russian Academy of Sciences (state registration № AAAA-A19-119011790132-7). Single-crystal X-ray diffraction analysis for 3g, 3f and 10a was performed using the equipment of the JRC PMR IGIC RAS. Single-crystal X-ray diffraction analysis for 5d, 7a, 9a and physicochemical studies were carried out using the equipments of the Center for Joint Use "Spectroscopy and Analysis of Organic Compounds" at the Postovsky Institute of Organic Synthesis UB RAS

A Rare Example of Discrete Lanthanide–Lithium Tetrakis-β-Diketonates: Synthesis, Structures, and Luminescence Properties

Abstract: The reactions of functionalized lithium CF3-β-diketonate (LiL) with europium(III) and terbium(III) chlorides in acetonitrile afford heterobimetallic complexes with the general formula [LiL-nL4(H2O)](CH3CN) (Ln = Eu (IIIa) and Tb (IIIb)). It is found that Ln–Li tetrakis-β-diketonates can also be prepared by the crystallization from acetonitrile of the previously synthesized complexes [(LnL3)(LiL)(MeOH)] (I) and [(LnL3)(LiL)(H2O)] (II). For the first time, the single crystals of the compounds in a series of Ln–Li tetrakis-β-diketonates are characterized by X-ray diffraction analysis (CIF files CCDC nos. 1973632 (IIIa) and 1973633 (IIIb)). The photoluminescence properties of the synthesized heterometallic complexes in the solid state are studied. © 2020, Pleiades Publishing, Ltd.This work was supported by the Russian Foundation for Basic Research (project no. 18-33-20124), Council for Grants of President of the Russian Federation (grant no. MK-1453.2019.3), and basic themes of the Russian Academy of Sciences (state registration nos. AAAA-A19-119011790132-7 and AAAA-A19-119012490006-1)

The study of TIM polymer composite materials thermal conductivity

Support by the Ministry of Education and Science of the Russian Federation is gratefully acknowledged: calculation results (chapter 3.1) were obtained under research project # 3.6064.2017/8.9 and experimental results (chapter 3.2) - under project # 3.10704.2018/11.12

The study of TIM polymer composite materials thermal conductivity

A recent trend in electronic technology deals with a sharp performance increase within decrease dimensions and mass of devices. High-performance thermal interface materials (TIM) primarily thermal pastes are indispensable to application. A number of filler materials: ceramics (aluminum nitride, silicon carbide, alumina) metals (aluminum, copper) and graphite were considered to apply. The data containing average particles size, specific surface area, and maximal volume and mass fraction for various materials was obtained. The thermal conductivity of samples with aluminum and graphite dramatically exceed values obtained within mathematical models' calculation. The highest thermal conductivity values were obtained for SiC (1.37 W/(m·K)), AlN (1.09 W/(m·K)), C (2.85 W/(m·K)) and Al (1.20 W/(m·K)), that mad the mentioned above materials the most promising for high-performance thermal pastes. © 2019 Author(s)

Technology development for obtaining a multilayer nanoporous aluminum oxide

Experimental preparation of multilayer nanoporous alumina was carried out. The oxide was obtained from aluminum, purity 99.7%. Obtaining aluminum oxide was carried out in a complex electrolyte containing a mixture of acids. The method of mixed multipulse anodizing was applied, using constant current and constant voltage modes. SEM investigated the obtained nanoporous oxide. The geometrical characteristics were determined. A method for controlling the thickness is proposed based on the analysis of changes in the growth rates of anodic alumina

Insertion of silica into nanoporous alumina by chemical deposition technique

This paper presents an experimental consideration of the deposition of silicon dioxide in a nanoporous material. The matrix was filled in organic media containing tetraethoxysilane. The analysis of the obtained product on XRD, silica, was carried out using scanning electron microscopy in combination with EDX analysis. The characteristics of the filling of nanopo-rous materials by chemical precipitation from organic liquid media are considered. Electro-physical characteristics of the obtained composite were studied