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81.
Shipovskaya A. B. Fomina V. I. Solonina N. A. Yusupova K. A. 《Russian Journal of Applied Chemistry》2012,85(1):120-127
Sorption of vapors of monobasic acids and of vapors over their solutions of various concentrations by high-molecular-weight
chitosan was studied. The dependence of the degree of the vapor sorption by the polymer on the acid solution concentration,
chitosan molecular weight, and sorption temperature was determined. Watersoluble chitosan derivatives were obtained. The hydrodynamic
properties of aqueous solutions of the modified samples were examined. 相似文献
82.
Alexander A. Simenel Svetlana V. Samarina Lubov' V. Snegur Zoya A. Starikova Larissa A. Ostrovskaya Natalia V. Bluchterova Margarita M. Fomina 《应用有机金属化学》2008,22(5):276-280
The antitumor activity of o‐carboxybenzoylferrocene sodium salt ( 1 ) was studied in vivo . Interaction between o‐carboxybenzoylferrocene ( 2 ) and N,N′‐carbonyldiimidazole in boiling methylene dichloride leads to 3‐(N‐imidazolyl)‐3‐ferrocenylisobenzofuran‐1(3H)‐one ( 5 ). The structure of compound 5 was established by X‐ray analysis. Aminolysis of compound 5 in toluene gave rise to ferrocenoylbenzamides ( 6a – d )–derivatives of dimethylamine, piperidine, pyrrolidine and morpholine. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
83.
O. V. Nazarova N. G. Fomina E. V. Afanas'eva E. F. Panarin 《Russian Journal of Applied Chemistry》2003,76(10):1647-1650
Copolymers of N-methacryloylaminodeoxyglucose with acrylic and methacrylic acids were prepared by radical copolymerization. The reactions of these copolymers with p-nitrophenol, N-hydroxysuccinimide, and N-hydroxyphthalimide in the presence of N,N'-dicyclohexylcarbodiimide were studied. 相似文献
84.
Lioudmila Fomina Abraham Reyes Serguei Fomine 《International journal of quantum chemistry》2002,89(5):477-483
The complex formation between fullerene C60 and simple donor molecules such as dimethyl ether, dimethylamine, dimethylsulfide, furan, pyrrole, and thiophene has been studied applying the hybrid MP2/6‐31G(d′):PM3 ONIOM approach for geometry optimization. Local implementation of Møller–Plesset perturbation theory in combination with 6‐31G(d) and 6‐311G(d,p) basis sets was used for binding energies estimation of fullerene complexes. Two factors were found to contribute most to the complex stability: the polarizability and molecular volume of donor molecule. As follows from positive stabilization energies at the Hartree–Fock level, the stabilization of fullerene complexes is entirely due to dispersion interactions in accordance with available experimental data. The calculations show that for donors of similar molecular volume the binding energy of molecular complex increases with polarizability of donor molecules. Similarly, for such complexes the partial charges on molecules increase with decreasing of ionization potentials of donor molecules. © 2002 Wiley Periodicals, Inc. Int J Quantum Chem, 2002 相似文献
85.
D. G. Yakhvarov E. A. Trofimova I. Kh. Rizvanov O. S. Fomina O. G. Sinyashin 《Russian Journal of Electrochemistry》2011,47(10):1100-1110
A new industrially applicable method of organonickel sigma-complexes production is developed. The technique is based on the
reaction of the oxidative addition of ortho-substituted aromatic bromides to electrochemically generated nickel(0)-2,2′-bipyridyl
complexes. Electrolysis is performed in undivided electrolyser supplied with sacrificial nickel anode with a periodic or continuous
electrolyte loading. The electrochemically obtained organonickel sigma-complexes of type [NiBr(Ar)(bpy)], where Ar is 2,4,6-trimethylphenyl,
2,4,6-triisopropylphenyl, 2,6-dimethylphenyl, are highly effective precatalysts for ethylene oligomerization process, leading
to the formation of linear alpha-olefines of C4–C12 fractions 相似文献
86.
Sergey P. Gromov Valery B. Nazarov Vitaly G. Avakyan Marina V. Fomina Artem I. Vedernikov Lyudmila G. Kuz’mina Tat’yana G. Vershinnikova Natalia A. Lobova Vladimir Yu. Rudyak Michael V. Alfimov Judith A.K. Howard 《Journal of photochemistry and photobiology. A, Chemistry》2011,217(1):87-99
The spontaneous and photoinduced protonation of 4-(2-naphthyl)pyridine (1) in solutions and in complexes with β-cyclodextrin (β-CD) and 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) were studied by absorption and fluorescence spectroscopy. The structure and stability of the complexes (log K = 1.5–2.3) of 1, its protonated form 2, and quaternized derivative, 1-methyl-4-(2-naphthyl)pyridinium perchlorate (3), with β-CD and HP-β-CD were studied by 1H NMR. It was shown that irrespective of the solution pH, compound 1 resides in the cyclodextrin cavity. HP-β-CD better binds the neutral form of 1 than β-CD, while naphthylpyridinium salts have approximately equal binding affinity to both cyclodextrins. The structures of salt 3 and pseudorotaxane complex 1@β-CD were determined by X-ray diffraction analysis. According to spectral data, pKa of 1 in water is 5.12, which promotes protonation of nitrogen both in the ground state and in the excited state. As a consequence, the fluorescence spectrum exhibits only the protonated form with a lifetime of 15 ns. The addition of HP-β-CD to a solution of 1 results in inclusion complex 1@HP-β-CD; simultaneously pKa of 1 decreases to 4.62 and non-protonated form fluorescence (NFF) of 1 with a lifetime of 1.25 ns appears. Thus, the residence of 1 in the HP-β-CD cavity hampers its protonation in the excited state. From comparison of the initial regions of fluorescence of 1 in solution and in the HP-β-CD complex after pulse excitation, a mechanism for appearance of short-lived NFF of 1 was proposed. Quantum chemical simulation of the protonation and complexation of 1 in the presence of water was performed. On the basis of results, reversible photoinduced mechanical motion of 1 in the HP-β-CD cavity was suggested. 相似文献
87.
I. G. Alekseev V. V. Belov M. V. Danilov I. V. Zhitnikov A. S. Kobyakin A. S. Kuznetsov I. V. Machikhiliyan D. V. Medvedev V. Yu. Rusinov D. N. Svirida N. A. Skrobova A. S. Starostin E. I. Tarkovsky M. V. Fomina E. A. Shevchik M. V. Shirchenko 《Physics of Particles and Nuclei Letters》2018,15(3):272-283
Apart from monitoring nuclear reactor parameters, the DANSS neutrino experiment is aimed at searching for sterile neutrinos through a detailed analysis of the ratio of reactor antineutrino spectra measured at different distances from the reactor core. The light collection system of the detector is dual, comprising both the vacuum photomultiplier tubes (PMTs) and silicon photomultipliers (SiPMs). In this paper, the techniques developed to calibrate the responses of these photodetectors are discussed in detail. The long-term stability of the key parameters of the detector and their dependences on the ambient temperature are investigated. The results of detector light yield measurements, performed independently with PMTs and SiPMs are reported. 相似文献
88.
A. S. Vereshchagin I. V. Kazanin V. N. Zinov’ev A. Yu. Pak A. F. Fomina V. A. Lebiga V. M. Fomin 《Journal of Applied Mechanics and Technical Physics》2013,54(2):243-250
A mathematical model of helium absorption by a sorbent consisting of hollow spherical particles with allowance for the distributions of permeability coefficients and particle sizes is constructed. A possibility of reconstructing the permeability coefficients of the microsphere materials from the known sorption curves and particle size distribution is demonstrated. The model is analyzed and tested by examples of two different sorbents. 相似文献
89.
Zh. V. Dobrokhotova I. G. Fomina G. G. Aleksandrov Yu. A. Velikodnyi V. N. Ikorskii A. S. Bogomyakov L. N. Puntus V. M. Novotortsev I. L. Eremenko 《Russian Journal of Inorganic Chemistry》2009,54(5):668-685
Methods of synthesis of binuclear pivalate complexes L2Ln2(μ-O,η2-OOCCMe3)2(μ2-O,O′-OOCCMe3)2(η2-OOCCMe3)2, where Ln = Sm, Eu, Gd, or Er and L = 2,2′-dipyridyl (Bipy) or 1,10-phenanthroline (Phen), from the corresponding binuclear complexes Ln2(μ2-OOCCMe3)4(OOCCMe3)2(HOOCCMe3)6 · HOOCCMe3(I–IV), as well as of coordination polymers {Ln(OOCCMe3)3} n , were suggested. The compounds were characterized by X-ray crystallography and X-ray powder diffraction and their magnetic properties, solid-phase thermolysis, and the phase composition of solid decomposition products were studied. The structures of the metal carboxylate core and surrounding ligands were shown to have an effect on the thermal stability of the complexes. The luminescence properties of the Eu(III) complexes were analyzed. 相似文献
90.
The form of the moment functions of up to seventh order inclusive describing the distribution of the elements of the microstructure of an epoxy glass-reinforced plastic has been experimentally established. 相似文献