B. S. Kaverin
Russian Academy of Sciences
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Featured researches published by B. S. Kaverin.
Physics of the Solid State | 2004
S. N. Titova; G. A. Domrachev; S. Ya. Khorshev; A. M. Ob”edkov; L. V. Kalakutskaya; S. Yu. Ketkov; V. K. Cherkasov; B. S. Kaverin; K. B. Zhogova; M. A. Lopatin; V. L. Karnatsevich; E. A. Gorina
A modified method is proposed for preparing fullerene compounds with alkali metals in a solution. The compounds synthesized have the general formula MenC60(THF)x, where Me = Li or Na; n=1–4, 6, 8, or 12; and THF = tetrahydrofuran. The use of preliminarily synthesized additives MeC10H8 makes it possible to prepare fullerene compounds with an exact stoichiometric ratio between C60n− and Me+. The IR and EPR spectra of the compounds prepared are analyzed and compared with the spectra of their analogs available in the literature. The intramolecular modes Tu(1)-Tu(4) for the C60n− anion are assigned. The splitting of the Tu(1) mode into a doublet at room temperature for MenC60(THF)x (n=1, 2, 4) compounds indicates that the fullerene anion has a distorted structure. An increase in the intensity of the Tu(2) mode, a noticeable shift of the Tu(4) mode toward the long-wavelength range, and an anomalous increase in the intensity of the latter mode for the Li3C60(THF)x complex suggest that, in the fullerene anion, the coupling of vibrational modes occurs through the charge-phonon mechanism. The measured EPR spectra of lithium-and sodium-containing fullerene compounds are characteristic of C60− anions. The g factors for these compounds are almost identical and do not depend on temperature. The g factor for the C60n− anion depends on the nature of the metal and differs from the g factor for the C60− anion.
Russian Journal of Applied Chemistry | 2015
A. V. Kadomtseva; A. V. Vorotyntsev; V. M. Vorotyntsev; A. N. Petukhov; A. M. Ob”edkov; K. V. Kremlev; B. S. Kaverin
Effect of a catalyst based on multi-walled carbon nanotubes modified with copper nanoparticles on the kinetics of the catalytic reduction of germanium tetrachloride by hydrogen was studied in the temperature range 423–723 K. Results of experiments were used to determine the reaction order and activation energy. A mechanism of the occurring reaction is suggested on the basis of the data obtained. The introduction of catalysts based on multi-walled carbon nanotubes modified with copper nanoparticles made it possible to lower the reaction temperature and achieve a germanium tetrachloride conversion of about 98%.
Journal of Surface Investigation-x-ray Synchrotron and Neutron Techniques | 2015
K. V. Kremlev; A. M. Obiedkov; S. Yu. Ketkov; B. S. Kaverin; N. M. Semenov; G. A. Domrachev; S. A. Gusev; D. A. Tatarskiy; P. A. Yunin
The deposition of rhenium nanoparticles on the surface of multiwalled carbon nanotubes (MWCNTs) is conducted by metal organic chemical vapor deposition (MOCVD) technology. The synthesized hybrid materials are analyzed using scanning electron microscopy, high-resolution transmission electron microscopy and powder X-ray diffraction. The dependence of the sizes and shapes of the deposited rhenium nanoparticles on the initial synthesis parameters is established. It is found that the size distribution of rhenium nanoparticles is bimodal on the surface of MWCNTs.
Physics of the Solid State | 2006
S. N. Titova; G. A. Domrachev; E. A. Gorina; L. V. Kalakutskaya; A. M. Ob”edkov; B. S. Kaverin; S. Yu. Ketkov; M. A. Lopatin; A. V. Markin; N. N. Smirnova; K. B. Zhogova
AbstractSoluble dimer compounds of the general formula [C60(Me3Si)n]2 (where n = 3, 5, 7, or 9 and Me = CH3) and a soluble monomer compound, C60(Me3Si)12, are synthesized by the reaction of the compound C60Nan(THF)x (where n = 4, 6, 8, 10, or 12 and THF = tetrahydrofuran) with trimethylchlorosilane Me3SiCl. The compounds synthesized are identified using IR and NMR spectroscopy and mass spectrometry. An irreversible endothermic effect exhibited by the [C60(Me3Si)7]2 compound in the temperature range 448–570 K is revealed by dynamic adiabatic calorimetry. From analyzing the experimental results, it becomes possible for the first time to demonstrate the structural flexibility of the fullerene in the following sequence of reactions:
Journal of Surface Investigation-x-ray Synchrotron and Neutron Techniques | 2009
A. M. Ob”edkov; B. S. Kaverin; S. A. Gusev; A. B. Ezerskii; N. M. Semenov; A. A. Zaytsev; V. A. Egorov; G. A. Domrachev
Russian Chemical Bulletin | 1994
G. A. Domrachev; B. S. Kaverin; E. G. Domracheva; S. A. Gusev; S. Yu. Ketkov; V. L. Karnatsevich; A. I. Kirillov; I. L. Vasilevskaya; M. A. Lopatin
\begin{array}{*{20}c} {C_{60} \xrightarrow[{ - 12C_{10} H_8 }]{{ + 12NaC_{10} H_8 }}C_{60} Na_{12} \xrightarrow[{ - 12NaCl}]{{ + excess Me_3 SiCl}}C_{60} (Me_3 Si)_{12} \xrightarrow[{ - 12Me_3 SiCl}]{{ + HCl(gas)}}[C_{60} H_n ]\xrightarrow[{ - 1/2nH_2 }]{{hv}}C_{60} } \\ {C_{60} \xrightarrow[{ - 8C_{10} H_8 }]{{ + 8NaC_{10} H_8 }}C_{60} Na_8 \xrightarrow[{ - 8NaCl}]{{ + excess Me_3 SiCl}}[C_{60} (Me_3 Si)_7 ]_2 \xrightarrow{{573K}}\begin{array}{*{20}c} {products of the} \\ {transformation of + } \\ {Me_3 Si groups} \\ \end{array} C_{60^ - } } \\ \end{array}
Russian Journal of Applied Chemistry | 2016
A. V. Kadomtseva; A. M. Ob”edkov; M. N. Semenov; B. S. Kaverin; S. A. Gusev
Physics of Wave Phenomena | 2011
V. O. Afenchenko; Alexander B. Ezersky; B. S. Kaverin; S. V. Kiyashko; S. A. Chesnokov
Technical Physics Letters | 2017
K. V. Kremlev; A. M. Ob”edkov; S. Yu. Ketkov; B. S. Kaverin; N. M. Semenov; S. A. Gusev; P. V. Andreev
Multiwalled iron-containing carbon nanotubes were synthesized by the MOCVD method with pyrolysis of ferrocene and toluene mixtures in an argon flow at atmospheric pressure. Using the MOCVD method with vacuum pyrolysis of bis-arene-chromium compounds onto the surface of multiwalled carbon nanotubes (MWCNTs), pyrolytic chromium films were deposited and new composite materials MWCNT/pyrolytic chromium were obtained. The composite morphology depends on the conditions of pyrolytic chromium deposition. Regular bead-shaped structures were detected. The mechanism of their appearance due to the formation of bis-arene chromium compounds of the intermediate viscoplastic polymer phase and the onset of Plateau-Rayleigh instability during pyrolysis is discussed.
Technical Physics Letters | 2016
K. V. Kremlev; A. M. Ob”edkov; S. Yu. Ketkov; B. S. Kaverin; N. M. Semenov; S. A. Gusev; D. A. Tatarskii; P. A. Yunin
Hexagonal close-packed (HCP) C60 and C70 films have been prepared by the Langmuir method and examined by electron microscopy and electron-diffraction analysis. It has been shown that the vacuum deposition of a C60+C70 mixture results in the formation of a film with small sized grains and a distorted C60-HCP structure. The simultaneous deposition of C60 and ferrocene results in the formation of a film with a changed morphology and an electron-diffraction pattern that contains a variable amount of ferrocene depending on the experimental conditions. The electron-diffraction pattern corresponds to the presence of the known molecular complex C60[(C5H5)2Fe]2. The analogous simultaneous deposition of fullerene C60 and cobaltocene results in the formation of a C60 film stable in air and water, which contains carbon and cobalt (from the data of X-ray fluorescence, electron microscopy and microdiffraction). It has a different morphology and different diffraction patterns than pure C60 films and, depending on the cobaltocene content (relative to that of fullerene), appears to be a fullerite film doped with various amounts of cobaltocenium fullende, which is an ionic compound.