Catalytic Activity of Complex-Oxide Perovskite-containing Compositions in Reactions of Oxidation of CO and Organic Compounds

The catalytic activity of composites constituted by a porous metallic or ceramic support, intermediate layers of oxide nature, and perovskite coatings, including those doped with silver, was studied in reactions of deep oxidation of CO and organic compounds of various classes. The relationship between the catalytic activity of a composite and its composition and nature of substances being oxidized was analyzed.     

Interaction between Mo132 nanocluster polyoxometalate and solvents

The interaction between solid Mo₁₃₂ nanocluster polyoxometalate with the structure of a keplerate and solvents of different natures (e.g., water, alcohols, hexane, and tetrachloromethane) is studied thermochemically. NMR spectroscopy is used to analyze interactions in solid polyoxometalate-organic compound systems in a gaseous medium. Data are collected on sorption interactions between a Mo₁₃₂ nanocluster and camphor.     

Interaction between Dioxane and Nanocluster Polyoxomolybdates and Their Composites Containing Water-Soluble Polymers

Russian Journal of Physical Chemistry A - New data are obtained on the thermodynamics and molecular mechanisms of the interaction between dioxane and nanocluster polyoxomolybdates of the keplerate...     

Sorption and Thermodynamic Characteristics of Compositions of Water-Soluble Nonionic Polymers and Nanocluster Polyoxomolybdates

Russian Journal of Physical Chemistry A - New data on the interaction between methanol vapors and compositions based on polyvinylpyrrolidone and polyvinyl alcohol that include nanocluster...     

Enthalpy of mixing of porous nanocluster polyoxometalates of keplerate-type Mo<Subscript>72</Subscript>Fe<Subscript>30</Subscript> with polyvinyl alcohol and polyethylene glycol

The interaction between porous spherical nanocluster polyoxometalate and water-soluble nonionic polymers (polyvinyl alcohol and polyethylene glycol) in the compositions of film is studied via calorimetry. The concentration dependences of the enthalpies of these processes are obtained using calculations based on the thermodynamic cycle.     

Molybdenum polyoxometalate buckyballs containing monochloroacetate groups and polymer compositions on their base

Molybdenum polyoxometalate buckyballs (NH₄)₄₂[MO₇₂^VIMO₆₀^VO₃₇₂(ClCH₂COO)₃₀(H₂O)₇₂] · 250H₂O · 15ClCH₂COONa (Mo132Cl) were synthesized; some of their properties were studied, namely, purity, spectral and crystallographic parameters, buckyball aggregation in solution, and interaction with water-soluble nonionic polymers (poly(vinyl alcohol) and poly(vinylpyrrolidone)). The newly synthesized polyoxometalate was shown to have a lower stability than its analogue containing acetate instead of chloroacetate groups, both having similar thermal destruction pathways. At the first heating steps, water is eliminated from Mo132Cl. Thermal destruction at higher temperature produces chloroacetamide, chloroacetonitrile, and other compounds.     

Study of the stability of solid polyoxometalate Mo72Fe30 with a buckyball structure

Samples of polyoxometalate Mo₇₂Fe₃₀: [Mo₇₂Fe₃₀O₂₅₂(CH₃COO)₁₂{Mo₂O₇(H₂O)}₂ {H₂Mo₂O₈(H₂O)}(H₂O)₉₁] · ??150H₂O with a buckyball structure, which can be both crystalline and amorphous, were synthesized. It was shown that such samples can be studied by neutron diffraction. The stability of Mo₇₂Fe₃₀ to heating and UV light exposure (in poly(vinyl alcohol) and polyvinylpyrrolidone films) was studied by IR, EPR, and electronic absorption spectroscopy; thermal analysis; and mass spectrometry. Mo₇₂Fe₃₀ was found to be less stable to heating and irradiation in a poly(vinyl alcohol) film as compared with the related polyoxometallate Mo₁₃₂ free of iron. The sorption properties of Mo₇₂Fe₃₀ to organic vapors and its stability under sorption conditions were studied. It was demonstrated that, in addition to sorption, organic substances cause the destruction of buckyballs.     

Migration of particles in an inhomogeneous medium

The migration of particles in a one-dimensional inhomogeneous crystalline structure is considered. Some general properties of the migration process are found. Exact results are obtained for structures with linear and periodic inhomogeneity.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 13–17, July, 1980.     

Viscosity and Electrophysical Characteristics of Solutions Containing Nanocluster Polyoxometalates and Polyvinylpyrrolidone

The physicochemical characteristics of solutions intended for preparing composites that contain a water-soluble polymer, polyvinylpyrrolidone (PVP), and nanocluster polyoxometalates (POMs) based on molybdenum with Keplerate (Mo₁₃₂ and Mo₇₂Fe₃₀) and toroidal structure (Mo₁₃₈) are studied. Concentration dependences of the kinematic viscosity of solutions upon changes in the absolute and relative contents of the polymer component are obtained along with the frequency dependences of the dielectric loss tangents of such solutions that correlate with them. The data allow us to confirm the composition of POM—polymers associates that form, and to estimate the relaxation parameters of ions in solutions.