3,5-Dimethylpyrazole Complexes with Strong Carboxylic Acids

3,5-Dimethylpyrazole and halogen-containing carboxylic acids in solution give rise to equilibrium between the free molecules and 1 : 1 and 1 : 2 H-complexes. These complexes either have a ion pair-like structure with two equivalent hydrogen bonds O^??HN⁺ (1 : 1) or include homoconjugate anion with strong hydrogen bond C-O-H?O-C (1 : 2). At low temperatures, 2 : 1 complexes were detected. The structure and harmonic vibration frequencies of the complexes were calculated in terms of the density functional theory.     

Hydrolysis of ZrF 6 2− anions in solutions of copper(II) ammine and synthesis of Cu x Zr(OH) y F z nanolayers by the ionic layering method

The possibility to synthesize M_1x M₂(OH) _y F _z nanolayers by the ionic layering method with the use of soluble anionic complexes of metal fluorides was demonstrated. The influence of the concentration and pH of reagent solutions and of the number of ionic layering cycles on the kinetics of layer growth was studied using the example of Cu _x Zr(OH) _y F _z layers. The composition of the synthesized layers was studied by X-ray photoelectron (XPE) spectroscopy, ellipsometry, and electronic and Fourier transform IR (FT-IR) transmission spectroscopy.     

In<Subscript>0.22</Subscript>SnS<Subscript>0.33</Subscript>(OH)<Subscript>4</Subscript> nanolayers synthesized by the layer-by-layer technique

The possibility of the synthesis of In_0.22SnS_0.33(OH)₄ nanolayers on the silica surface by the layer-by-layer technique was demonstrated. The synthesized layers were studied by ellipsometry, X-ray spectral microanalysis, and electronic and IR Fourier spectroscopy.     

Ozone interaction with manganese acetate solution. Formation of H x MnO2·nH2O layers and microtubes based on them

We present the first study of Mn(II) cations interaction with ozone fed onto the air/aqueous manganese acetate solution boundary. In the reaction, the layer of H _x MnO₂·nH₂O of birnessite structure has been formed at the surface. Subsequent ～1–3 μm thick layers drying at air has led to their rolling up to form microtubes with diameter of 20–50 μm and up to 10 mm long.     

Synthesis of Highly Oriented α-PbO2 Layers on the Surfaces of Single-Crystal Silicon and Quartz by Successive Ionic Layer Deposition

Conditions for the synthesis of -PbO₂ layers on silica surfaces by successive ionic layer deposition were determined. These layers were studied by X-ray spectral microanalysis, X-ray diffraction, IR Fourier spectroscopy, UV-Vis spectroscopy, and ellipsometry.     

Synthesis of Bi-O- and Bi-V-O-containing Nanolayers by Ionic Deposition

A possibility of preparing Bi₂O₃ and BiVO₄ nanolayers by ionic deposition on the silica surface was shown for the first time. The influence of the concentration and pH of reactant solutions and of the number of ionic deposition cycles on the kinetics of the nanolayer growth was studied. The conditions were determined for the formation of a nanolayer by a reaction in a layer of ions sorbed on the surface. The thickness of the synthesized layers was determined by ellipsometry. The layer compositions were studied by X-ray spectral microanalysis, X-ray photoelectron spectroscopy, and UV and IR Fourier transform spectroscopy. The structure of the layers was studied by powder X-ray diffraction.     

Algorithms of compacting the knowledge base by sample data

Some optimal algorithms to solve the problem of the extraction of knowledge from empirical samples are suggested. Translated fromStatisticheskie Metody Otsenivaniya i Proverki Gipotez, pp. 117–125, Perm, 1993.     

Calculation of fractional parentage coefficients for the (1d-2s)-shell nuclei with the projection-operator method

The projection operators for the groupsSU _n are used for constructing the noncanonical basis vectors of irreducible representations of these groups as linear combinations of the Gel'fand-Tseitlin canonical basis vectors. The structure of the basis vectors of the irreducible representation of the groupsSU ₄,SU ₃,SU ₆ in the case of the reductionSU ₄ SU ₂×SU ₂,SU ₃R ₃ andSU ₆ SU ₃, respectively, is discussed. A number of formulae have been obtained for the fractional parentage coefficients for the (1d-2s)-shell nuclei.     

Layer-by-layer synthesis and study of nanostructured Pb<Subscript>4</Subscript>SbS<Subscript>6.5</Subscript> layers

Conditions for the layer-by-layer synthesis of nanostructured Pb₄SbS_6.5 layers on a silica surface, using reagent solutions, were determined. The synthesized layers were studied by X-ray photoelectron spectroscopy, UV and visible transmission spectroscopy, X-ray spectral microanalysis, and scanning electron microscopy.