Zobrazeno 1 - 10
of 32
pro vyhledávání: '"R. I. Maksimovskaya"'
Autor:
Vladimir I. Zaikovskii, V. G. Vasil’ev, R. I. Maksimovskaya, M. A. Fedotov, Oxana A. Kholdeeva, S. S. Arzumanov, G. M. Maksimov
Publikováno v:
Journal of Structural Chemistry. 50:618-627
Heteropoly acid (HPA) H8(PW11TiO39)2O·xH2O (I) is synthesized by three different ways and studied by chemical analysis, potentiometric titration, mass-spectrometry, IR, 31P, 183W, and 17O NMR spectroscopy, thermogravimetry, and transmission electron
Autor:
R. I. Maksimovskaya, M. A. Fedotov
Publikováno v:
Journal of Structural Chemistry. 47:952-978
The results of structural investigations of vanadium, molybdenum, and tungsten polyoxoanions (PA) by 17O, 51V, 95Mo, 183W, and heteroatom NMR are generalized in this review. NMR spectroscopy possibilities to determine the structure of PA are discusse
Autor:
R. I. Maksimovskaya, Elena B. Burgina, T. V. Andrushkevich, Galina I. Aleshina, Larisa S. Dovlitova, Valentina M. Bondareva, Plyasova Lyudmila M
Publikováno v:
Reaction Kinetics and Catalysis Letters. 88:183-191
Genesis of an active component in V-Mo-Nb-O catalysts for the oxidation and ammoxidation of ethane was studied. It was shown that the mixing of aqueous solutions of initial reactants leads to the formation of MoV complexes in the solution and to sedi
Publikováno v:
Russian Chemical Bulletin. 52:103-108
According to the 31P NMR spectroscopy, heteropolyacid (HPA) H6P2Mo18O62·nH2O (P2Mo18), α-isomer of the Dawson structure, transforms upon heating above 80 °C partially (up to 30%) to γ-isomer, in which both polar groups Mo3O13 of the heteropolyani
Publikováno v:
Inorganic Materials. 39:687-693
A method is proposed for the synthesis of heteropoly acids from oxides of molybdenum, tungsten, and vanadium via mechanochemical activation. The fundamental principles of this approach to the synthesis of heteropoly acids containing different ligands
Publikováno v:
Russian Chemical Bulletin. 50:587-590
The acidity on the “proton affinity” scale was determined by IR spectroscopy of the pyridinium salts for nineteen heteropoly acids of nine structural types (including two with the previously unknown structure) and one isopoly acid. All heteropoly
Autor:
Elena B. Burgina, Marina V. Chaikina, Yu. V. Frolova, Vladimir I. Zaikovskii, S. V. Tsybulya, N. N. Kuznetsova, D. I. Kochubei, R. I. Maksimovskaya, Vladimir V. Kriventsov, Dinesh K. Agrawal, Eugenii A. Paukshtis, G. S. Litvak, Vladislav A. Sadykov, Rustum Roy, V. V. Lunin, V. N. Kolomiichuk, Svetlana N. Pavlova, G. V. Zabolotnaya
Publikováno v:
Kinetics and Catalysis. 42:390-398
Results of the systematic study of the synthesis of highly dispersed framework zirconium phosphates stabilized by ammonium, lanthanum, aluminum, manganese, and cobalt cations are summarized. The synthesis involves the mechanochemical activation of a
Publikováno v:
Kinetics and Catalysis. 42:217-222
The 31P NMR method shows that four forms of titanium(IV)-monosubstituted Keggin-type heteropolytungstate (Ti–HPA) exist in MeCN: the dimer (Bu4N)7[{PTiW11O39}2OH] (in the abbreviated form, (PW11Ti)2OH or H1), its conjugate base (PW11Ti)2O (1), and
Autor:
Maria N. Timofeeva, G. M. Maksimov, M. M. Matrosova, R. I. Maksimovskaya, E. A. Paukshtis, Vladimir A. Likholobov, A.V. Golovin
Publikováno v:
Kinetics and Catalysis. 42:791-795
The esterification reaction of n-butanol with acetic acid ([BuOH] : [HOAc] = 1 : 15 mol/mol; 55°C, 5% H2O) was studied in the presence of tungsten heteropoly acids of the Keggin (H3PW12O40, H4SiW12O40, H5PW11TiO40, H5PW11ZrO40, and H3PW11ThO39) and
Publikováno v:
Reaction Kinetics and Catalysis Letters. 66:311-317
Acid tetrabutylammonium salts of Ti(IV)-monosubstituted heteropolytungstate, PW11TiO405−, show high catalytic acitivity in the oxidation of methyl phenyl sulfide with hydrogen peroxide, while the corresponding tetrabutylammonium salts containing no