Zobrazeno 41 - 50
of 52
pro vyhledávání: '"R. I. Maksimovskaya"'
Publikováno v:
Reaction Kinetics and Catalysis Letters. 38:57-62
The rate constants of interactions of PW12-nVnO40 (3+n)− (n=1–4) heteropoly anions (HPAs) and various PW10V2O40 −5 isomers with VO2+ were measured. The reactions occurred via formation of intermediate active complexes with V(IV) ions incorporat
Publikováno v:
Polyhedron. 8:2739-2742
UV, IR, 7Ga and 17O NMR spectra clearly demonstrate the Keggin structure for the new heteropolyanion—12-molybdogallate (12-MGA). The UV spectrum of the 12-MGA solution has charge-transfer bands at 49,000, 40,000 and 32,500 cm−1, which have been a
Publikováno v:
Reaction Kinetics and Catalysis Letters. 38:45-50
Redox properties of some isomers of tungstovanadophosphoric heteropoly anions have been studied. Rate constants of electron transfer from α-1, 2, 3-PW9V 2 V VIVO 40 7− to PW11VVO 40 4− (k=1.1±0.2)×102 dm3/mol s) and from PW10VVVivO 40 6− to
Publikováno v:
Reaction Kinetics and Catalysis Letters. 16:185-189
17O,51V and31P NMR studies indicate that the anion structure of sodium vanadophosphate in an aqueous solution is close to that in crystals of the (CN3H6)8HPV14O42 7H2O salt.
Publikováno v:
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 32:215-219
1. The heteropolyanions (HPA) P2Mo18O626−, and theα- and β-isomers of P2W18O626− have been studied in aqueous solution by17O,31P,95Mo, and183W NMR. 2. The17O NMR spectrum of the HPA X2M18O626− in solution corresponds to the structure of the H
Publikováno v:
Journal of Molecular Catalysis. 38:345-353
The low-temperature oxidation of CO to CO2 by solutions of PdSO4 and various heteropolyacids (HPAs) has been studied. The dependence of the reaction rate on the potential of HPA determined by its composition has been obtained. At moderate values of H
Publikováno v:
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 32:660-665
1. The reduced 8-tungsto-4-vanadophosphate heteropoly acid (HPAc) hardly dissociates at all with the release of free vanadyl ions in 50% acetic acid at pH ≥ 3. 2. The kinetics of the oxidation of the heteropoly blue containing two vanadium(IV) atom
Publikováno v:
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 33:1977-1982
1. In aqueous solutions containing vanadium(V) and tungsten (VI) isopolyanions V3W30195− are formed at pH 7–9 which are isostructural with the isopolyanions VW5O193− and V2W4,O194−. 2. The51V NMR spectra of the salt K6V4W9O40· 24H2O have con
Publikováno v:
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 35:1977-1981
1. By means of ether extraction with monitoring by31p and51v NMR, fractions of H5PV2W10O40.nH2O enriched in various isomers have been obtained. 2. The PV2W10O405− isomer with the vanadium atoms in one Keggin triplet undergoes protonation and forms
Publikováno v:
Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 34:488-493
1. Peroxo complexes of phosphotungstic heteroply acid catalyze the epoxidation of allyl alcohol. 2. The composition of the solution during the process of the reaction is studied by the method of13C and31P NMR, the reaction kinetics is studied accordi