High-frequency asymptotic behavior of the electromagnetic field on the surface of a stratified medium

Translated from Metody Matematicheskogo Modelirovaniya i Vychislitel'noi Diagnostiki, pp. 174–180, Izd. Moskovskogo Universiteta, Moscow, 1990.     

Complexes of Cobalt(II) and Zinc(II) with Heterocyclic Compounds Derived from 1,3-Indanedione

Complexes of Co(II) and Zn(II) with three-membered structures containing 1,3-indanedione, 1,3,4-thiadiazole, and pyridine moieties were obtained.     

Macroheterocyclic Compounds with 2,3-Pyridino(pyrazino)pyrrole and 1,3,4-Thiadiazole Residues

Novel symmetrical macroheterocyclic compounds were prepared by the reactions of 2,3-dicyanopyridine and 2,3-dicyanopyraine with 2,5-diamino-1,3,4-thiadiazole in butanol in the presence of sodium butylate. Physicochemical properties and biological activity of the products were studied.     

Iron tricarbonyl complexes of hydroxypolymethylbenzolonium ions

Russian Chemical Bulletin -     

Electrokinetic Phenomena in Sulfonated Cation-Exchange Membranes with Tetraalkylammonium Ions

The electric transport of solvent ions and molecules through membrane systems containing cations of tetraalkylammonium bases is studied. The interrelation between electrokinetic characteristics of sulfonated cation-exchange membranes at different degrees of their saturation with tetrabutylammonium ions and the content of water in membranes at equilibrium is established. A new type of conductor-insulator percolation transitions is revealed for homogeneous MF-4SK perfluorinated membranes saturated with organic counterions. This transition is interpreted with allowance for the concept of the governing role of narrow channels in the membrane microstructure. The electroosmotic permeability of MF-4SK membranes in solutions of sodium and tetraethylammonium chloride, as well as in their mixtures, is studied. An experimentally observed abnormally high amount of water transferred by tetraethylammonium ions is discussed with allowance for the dynamic hydration characteristics of ions.__________Translated from Kolloidnyi Zhurnal, Vol. 67, No. 4, 2005, pp. 485–493.Original Russian Text Copyright © 2005 by Kononenko, Berezina, Shkirskaya.     

synthesis and properties of β-brominated metal complexes of meso-triphenylcorrole

Spectral properties and chemical stability of Mn(III), Mn(IV), Fe(III), Fe(IV), and Cu(III) complexes of β-octabromotriphenylcorrole [(β-Br)₈(ms-Ph)₃Cor], synthesized from β-unsubstituted compounds by their reaction with molecular bromine, were studied. Cyclic voltammetry, electron microscopy, and X-ray spectral microanalysis were used to obtain electrochemical characteristics of metal corroles M(β-Br)₈(ms-Ph)₃Cor and gain insight into the surface texture of active catalysts on the basis of metal corroles. The electron-acceptor β-bromine substitution in the MCor macrocycle shifts the equilibrium in electron-donor solvents to lower oxidation states of the metals and also stabilizes manganese and destabilizes copper complexes in the protondonor medium HOAc-H₂SO₄. The electrocatalytic activity of the complexes in the reduction of molecular oxygen depends on the nature of the ligand and increases in the order Mn ≤ Cu ? Fe in the case of β-octabrominated macrocycles. The character of distribution of active centers on the surface of the catalysts was established for the first time.     

Synthesis and properties of macroheterocyclic compounds containing 1-imino-2-phenyl-1H-inden-3-amine fragments

Reaction of 1-imino-2-phenyl-1H-inden-3-amine with 3,3′-dichloro-, 2,2′-disulfo-, and 2,2′-dinitrobiphenyl-4,4′-diamines gave 2 : 1 and 1 : 2 linear condensation products and symmetrical macroheterocycles. The products were characterized by the IR, UV, and 1H NMR data.     

Acylpyruvic Acids Amides and Hydrazides: VIII. Synthesis of Pivaloylpyruvamides and Their Reactions with Benzylamine and Arylamines

Pivaloylpyruvamides were obtained by reaction of pivaloylpyruvic acid with ammonia, primary and secondary amines. The amides in solutions exist as an equilibrium tautomeric mixture of ketoenol and minor -diketone forms. The pivaloylpyruvamides under mild conditions react with benzylamine or arylamines to furnish products of substitution at the -carbonyl group, the corresponding amides of (Z)-2-benzylamino- or 2-arylamino-5,5-dimethyl-4-oxo-2-hexenoic acid. The latter also exist in solutions as two tautomers. The amides synthesized possess a biological activity.     

Diffusion of solutions in the course of the matrix synthesis of composite membranes MF-4SC—polyaniline and their transport properties

The dependence of the kinetics of diffusion transfer of solutions through MF-4SC and MC-40 ion-exchange membranes during the matrix synthesis of polyaniline on the composition of feed solutions and the nature of the initiating agents and the polymer matrix is studied. The effect of the conditions of the modification of the parent membrane on the resultant physicochemical characteristics is studied. The conditions of synthesis for the preparation of MF-4SC—polyaniline (emeraldine) composites with an optimized combination of conducting and diffusion characteristics are found. The contribution of electron conductivity to the overall proton-electron conductivity of the composite films is estimated.