Synthesis and spectral properties of mixed-ligand platinum(II) complexes with (-)-<Emphasis Type="Italic">S</Emphasis>-NOBIN and sulfoxides

Synthesis was carried out of the new mixed-ligand square-planar platinum(II)complexes {Pt(R2SO)[(-)-S-NOBIN]Cl₂}, where (-)-S-NOBIN was S-2-amino-2′-hydroxy-1,1′-binaphthyl (R = Me, Et). The complexes are of interest as catalysts for asymmetrical synthesis. The detailed analysis of NMR, UV, and CD spectra of these compounds was performed. These complexes were established to be a mixture of the corresponding cis- and trans-isomers.     

The formation of nickel(II) chloride ammine complexes in the pores of modified fibers of cellulose cloth

A sorbent was synthesized as a cellulose cloth, the fibers of which have nanopores with walls made of cellulose chains and ethanol cyclams. The formation of (NH₄)₂[NiL(NH₃)₂Cl₂] complexes where L^2– is the CH–(O^–)–CH–(O^–) glucopyranose group was established by chemical analysis and IR and UV/Vis spectroscopy. Using small-angle X-ray scattering and measurement of the partial free space and adsorption capacity, the complex formation in the [Ni(NH₃)₆]Cl₂ concentration range of up to 0.43 mol/L was found to occur in nanopores with the sorption constant K _sorb = 15.8. The limiting content of the complexes is 2.63 mmol/g and their effective radius is 0.45 nm. In the concentration range of 0.43–0.91 mol/L, the complexation occurs on the fiber surface, K _sorb = 1.85. The effective radius of the complexes is 0.5 nm.     

Low-toxicity complexes with nitrogen-containing ligands as promising new agents for treatment and prevention of free radical states

A method for synthesis of complexes with 1,5-pentamethylenetetrazole ligand was proposed. These compounds hold promise for antioxidant treatment of so-called “free radical” diseases of different geneses, including those caused by unfavorable environmental factors. The antioxidant activity of the complexes synthesized was tested by two independent methods: by assessing the ability to inhibit lipid peroxidation and by measuring the SOD-like activity.     

DIE AMBIDENTE REAKTIONSFÄHIGKEIT DES RHODANIDANIONS IN DER REAKTION MIT 2-PROPOXYCARBONYLTHIOCYANAT

Abstract

By pursuing the reaction between 2-propyloxycarbonylthiocyanate and ¹⁴C-potassiumrhodanide the relative reactivity of the nitrogen and sulfur in the rhodanideanion has been determined.

Durch Verfolgen der Reaktion zwischen 2-Propoxycarbonylthiocyanat und ¹⁴C markiertem Kaliumrh odanid wurde die relative Reaktionsfähigkeit des Rhodanidanions in bezug auf das Stickstoffatom und das Schwefelatom bestimmt.     

Kinetics of homogeneous dehydrogenation of formic acid in the presence of supramolecular rhodium(III) complex with P-functionalized calix[4]resorcine

The kinetics of homogeneous dehydrogenation of formic acid in the presence of supramolecular rhodium(III) complex with P-functionalized calix[4]resorcine were studied in dioxane, tetrahydrofuran, dimethylformamide, and binary formamide-dioxane mixtures (volume ratio 10: 90, 20: 80, 30: 70) over a wide temperature range (40?C90°C). The examined Rh(III) complex catalyzed the dehydrogenation process, and its catalytic activity was higher than that observed previously for rhodium complexes with non-macrocyclic phosphorus-containing ligands. The dehydrogenation rate constants were proportional to neither catalyst concentration nor dielectric constant of the medium, which is likely to be related to supramolecular nature of the Rh(III) complex. No micelle formation was observed in the examined systems.     

Complex of laser processing techniques for production of fine-meshed grids of refractory materials

Laser processing techniques were used for production of fine-meshed control grids for cathode assemblies. In this paper we discuss the features of development and production of grids made of refractory materials with concentric arrangement of meshes and wires. Two different types of grid structures are studied: a pyrographite grid with thin wires and a molybdenum grid with small round meshes. The grid with concentric arrangement of meshes is connected with multibeam field-emission cathode which is also produced by laser processing techniques. High-performance, high-speed laser microperforation allows one to obtain high convergence between grid and cathode. The paper also contains an estimation of the defect zone size after the action of the laser.     

Thermodynamic and orientational properties of two-dimensional multicomponent hard rectangle fluids

A molecular statistical model is developed for a two-dimensional multicomponent fluid composed of hard rectangles. The configurational partition function of such a system on a square lattice is evaluated by applying the orientation dependent version of the Flory-Huggins probability method. Unlike earlier treatments of similar problems, the final result for the configurational entropy is independent of the order of placement of the rectangular plate-like particles. The present approach has been extended to enable an analysis of both facewise and edgewise modes of adsorption of rectangular molecules on a planar surface. Further, the limit of infinitesimal lattice size has been considered as the generalized continuous version of the corresponding lattice model. The results obtained within the present continuous approach are compared with those of studies of related one-component hard body fluids.     

Stabilization and modification op polyolefins used in medical articles

The thermo and radiation aging of polyolefins and their blends were studied. It was shown that near the inversion point of phase there is the most marked interaction between continuous and dispersed components of blend. This interaction results in an improvement of blend stability higher than expected. The investigation of the influence of supermolecular structure of PP stability revealed the small spherulite samples are more stable under irradiation in air than large spherulite ones. The possibility of obtaining composites of polyolefins and silicon liquids urns shown.     

Effect of specific adsorption of anions on the kinetics of the current relaxation after pulsed anodic activation of dissolution of hydrophilic metals

Based on the model of spatial separation of the dissolution and passivation of hydrophilic metals, the effect of strong specific adsorption of anions on the shape of curves for the relaxation of anodic current of metals in acid solutions after switching an anodic activation pulse off is considered by using iron as an example.     

Electrodynamic analysis of reflector antennas using a self-consistent method

The electrodynamic analysis of reflector antennas (RAs) is performed with the aid of a self-consistent method. The mathematical model of such antennas is reduced to a system of 2D hypersingular integral equations. By way of example, an RA with a reflector that represents a parabolic cylinder is analyzed. The directional pattern of the antenna and the current-density distributions on the surfaces of the reflector and feed are presented.