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21.
Tran TB Beloborodov IS Lin XM Bigioni TP Vinokur VM Jaeger HM 《Physical review letters》2005,95(7):076806
We investigate the effects of inelastic cotunneling on the electronic transport properties of gold nanoparticle multilayers and thick films at low applied bias, inside the Coulomb-blockade regime. We find that the zero-bias conductance, g(0)(T), in all systems exhibits Efros-Shklovskii-type variable range hopping transport. The resulting typical hopping distance, corresponding to the number of tunnel junctions participating in cotunneling events, is shown to be directly related to the power-law exponent in the measured current-voltage characteristics. We discuss the implications of these findings in light of models on cotunneling and hopping transport in mesoscopic, granular conductors. 相似文献
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L. D. Popov S. A. Borodkin I. N. Scherbakov Yu. N. Tkachenko G. G. Aleksandrov S. S. Beloborodov A. A. Zubenko V. A. Kogan O. V. Maevskii 《Russian Journal of General Chemistry》2013,83(7):1376-1382
A new Schiff’s base and its salt have been prepared from 2-aminophenyl(triphenyl)phosphonium chloride and 5-hydroxy-3-methyl-1-phenyl-4-formylpyrazole. The products structures have been proved by IR, 1H NMR, and UV spectroscopy, mass spectrometry, X-ray diffraction analysis, and quantum-chemical modeling. Possible tautomerism and some properties of the products have been studied. 相似文献
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M. N. Achasov K. I. Beloborodov A. V. Berdyugin A. G. Bogdanchikov A. V. Bozhenok D. A. Bukin S. V. Burdin A. V. Vasil’ev T. V. Dimova A. A. Drozdetskii V. P. Druzhinin V. B. Golubev V. N. Ivanchenko A. A. Korol’ M. S. Korostelev S. V. Koshuba A. P. Lysenko I. N. Nesterenko E. V. Pakhtusova A. A. Sal’nikov S. I. Serednyakov V. A. Sidorov Z. K. Silagadze A. G. Skripkin Yu. V. Usov V. V. Sharyi Yu. M. Shatunov 《JETP Letters》2001,73(9):451-452
The η→3π0 decay was studied with the SND detector at the VEPP-2Me + e ? collider. The parameter that describes deviation of the Dalitz plot of events from a uniform distribution was found to be α=?0.010±0.021±0.010. 相似文献
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S. I. Levchenkov I. N. Shcherbakov L. D. Popov K. Yu. Suponitskii A. A. Tsaturyan S. S. Beloborodov V. A. Kogan 《Russian Journal of Coordination Chemistry》2014,40(2):69-76
A tetranuclear copper(II) complex based on azomethine, which is the condensation product of 1-phenyl-3-methyl-4-formylpyrazol-5-one with 1,3-diaminopropan-2-ol, is synthesized. The complex includes two different tetranuclear clusters: symmetrical and unsymmetrical. They have a pseudo-cubane structure and are in a ratio of 1 : 2. The quantum-chemical calculation shows that the “unsymmetrical” conformer does not correspond to the local minimum on the molecular potential energy surface. Its existence is thus determined by the crystalline packing effects. According to the results of measurements of the temperature dependence of the magnetic susceptibility, the ground spin state is a singlet caused by the overall antiferromagnetic interaction between the copper ions. Accepting the molar magnetic susceptibility of the complex to be equal to the sum of susceptibilities of the “symmetrical” and “unsymmetrical” clusters and assuming that the spin-Hamiltonian for both clusters includes three exchange parameters, the temperature dependence of the magnetic susceptibility of the complex is satisfactorily described with the following parameters of the model: J 1A = ?178, J 2A = 80, J 3A = 18, J 1B = ?26, J 2B = ?74, J 3B = 46 cm?1, g A = g B = 2.05. 相似文献
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Synthesis of 2,5,7‐Triaryl‐4,7(6,7)‐dihydropyrazolo[1,5‐a]pyrimidine‐3‐carbonitriles by Reaction of 5(3)‐Amino‐3(5)‐aryl‐1H‐pyrazole‐4‐carbonitriles with Chalcones
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Maksim A. Kolosov Dmitriy A. Beloborodov Olesia G. Kulyk Valeriy D. Orlov 《Journal of heterocyclic chemistry》2014,51(Z1):E89-E92
The reaction of 5(3)‐amino‐3(5)‐aryl‐1H‐pyrazole‐4‐carbonitriles with 1,3‐diaryl‐2‐propen‐1‐ones (chalcones) in refluxing DMF leads to 2,5,7‐triaryl‐4,7(6,7)‐dihydropyrazolo[1,5‐a]pyrimidine‐3‐carbonitriles. In DMSO solution, the latter exist in equilibrium of two tautomeric 4,7‐dihydropyrazolo[1,5‐a]pyrimidines and 6,7‐dihydropyrazolo[1,5‐a]pyrimidines in various ratios, depending on the nature of aryl substituents in chalcone building blocks. 相似文献
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S. I. Levchenkov L. D. Popov I. N. Shcherbakov G. G. Aleksandrov A. A. Tsaturyan S. S. Beloborodov O. V. Maevskii V. A. Kogan 《Russian Journal of Coordination Chemistry》2013,39(7):493-499
The binuclear copper(II) complex with 2,6-diformyl-4-tert-butylphenol bis(imidazolinylhydrazone) (H3L), [Cu2(H2L)Br2]ClO4 (I), was synthesized. The structure of complex I was determined by X-ray diffraction analysis. The antiferromagnetic exchange interaction (2J = ?108 cm?1) translated through the phenoxide oxygen atom is observed between the copper(II) ions. The exchange parameter was calculated by the quantum-chemical “broken symmetry” method. 相似文献
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S. I. Levchenkov I. N. Shcherbakov L. D. Popov S. N. Lyubchenko K. Yu. Suponitskii A. A. Tsaturyan S. S. Beloborodov V. A. Kogan 《Russian Journal of General Chemistry》2013,83(10):1928-1936
2,6-Di-tert-butyl-p-quinone 1′-phthalazinylhydrazone (HL) was synthesized. Quantum-chemical calculations of the energy of possible tautomeric forms of the hydrazone were performed. The complexes of Zn(II), Hg(II), Ni(II), and Cu(II) of ML2 composition were obtained and studied. The structure of the NiL2 complex was established by XRD. It was shown by DFT-D3 calculations that the cis-structure of the complex is stabilized due to the interligand dispersion interaction. 相似文献
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M. N. Achasov K. I. Beloborodov A. V. Berdyugin A. G. Bogdanchikov D. A. Bukin A. V. Vasiljev V. B. Golubev T. V. Dimova V. P. Druzhinin L. V. Kardapoltsev I. A. Koop A. A. Korol S. V. Koshuba E. V. Pakhtusova S. I. Serednyakov Z. K. Silagadze A. N. Skrinsky A. G. Kharlamov Yu. M. Shatunov 《Journal of Experimental and Theoretical Physics》2011,113(1):75-79
In the energy range from 1.05 to 1.38 GeV, the upper limits for the cross sections of e + e ? → f 0(600)γ, f 0(980)γ, f 0(1350)γ, and f 2(1270)γ → π0π0γ processes have been established. Measurements are performed in accordance with the statistics gathered in experiment with a spherical neutral detector (SND) on the VEPP-2M e + e ? collider. The resultant upper limits vary from 6 to 42 pb depending on the energy and the model. 相似文献