V. Yu. Frolov

NMR, EPR, and mass spectroscopy estimates of the antiradical activity of water with modified isotope composition

The dynamics of the change in the deuterium content in plasma of laboratory animal blood is studied by nuclear magnetic resonance spectroscope using water with modified isotope composition. The change in deuterium content in lyophilized animal tissues is determined by mass spectrometry. The content of paramagnetic centers in a dose and in pathology is determined on an electron paramagnetic resonance spectrometer.

Effect of amalgamation on the passivation of transition metals in their anodic dissolution in tetrahydroadipic acid solutions

Effect of anode amalgamation on the degree of passivation of the electrodes and on the current efficiency in electrosynthesis of coordination compounds of copper(II), nickel(II), zinc(II), and cadmium(II) with galactaric acid was studied. An improvement of anodic synthesis characteristics was observed when amalgamated zinc, copper, and cadmium were used. Complex compounds of 1 : 1 composition were obtained and the structure of the coordination environment of the metal ion was determined by IR spectroscopy.

Influence of the method of synthesis on the composition and structure of copper(II) complexes with galactaric acid

The influence of the conditions and the method of synthesis on the composition of copper(II) complexes with galactaric acid (H2Gala) has been studied. In aqueous and water-DMSO solutions, 1 : 1 complexes are formed. Depending on the procedure and conditions of the synthesis, CuGala · 4H2O, Cu(HGala)2 · 4H2O, and (CuOH)2Gala · 2H2O compounds have been obtained. The structure of the coordination environment of the metal ion has been identified by IR spectroscopy.

Complex Formation of Copper(II) Ions with Galactaric Acid

Complex formation of copper(II) ions with the galactarate ion [Gala]2- in aqueous solution was studied by means of potentiometric titration. Stability constants of the [CuGala] and [Cu(Gala)2]2- complexes were determined. A complex compound was synthesized electrochemically and isolated from a DMSO solution containing a copper(II) salt and galactaric acid, and its composition was determined. The structure of the complex was determined by ESR.

Hydrogen Permeability of a Foil of Pd–Ag Alloy Modified with a Nanoporous Palladium Coating

Thin films with the composition Pd–23% Ag are obtained via magnetron sputtering. The magnetron sputtering of Pd–50% Zn films with subsequent diffusion annealing and etching of the active component is used to modify the surfaces of palladium–silver films to improve their hydrogen permeability. Modifying the surfaces of the resulting Pd–Ag films using a nanoporous palladium coating with a predominant distribution of particles ranging from 0 to 50 nm allows a hydrogen flux density of up to 0.4 mmol s−1 m−2 to be achieved for sufficiently thin palladium membranes (<10 μm) under conditions of low temperature (<90°C) and pressure (<0.6 MPa). Experimental evidence is gathered that under these conditions, the velocity of hydrogen transport is limited by dissociative–associative processes at membrane boundaries and can be greatly (by an order of magnitude) increased, due to acceleration of the limiting stage of the process via the formation of a palladium nanoporous coating on the film’s surface.

Synthesis of copper(II) coordination compounds with benzoxazine derivatives

Copper(II) complexes with 1,2-dihydro-4H-3,1-benzoxazine (HL) derivatives, CuLOH, were prepared by anodic electrosynthesis. The use of an amalgamated copper anode resulted in an increase in the electrosynthesis rate. It follows from the IR spectra of the products that the benzoxazine ring in the ligand molecule is opened upon complexation, while a six-membered chelate ring involving the oxygen atom of the deprotonated phenol group and the imine nitrogen atom is formed.

Synthesis and study of copper(II), nickel(II), and cobalt(II) complex compounds with dihydrobenzoxazine derivatives

Complex compounds ML2 of copper(II), nickel(II), and cobalt(II) with 2-(2-hydroxy-5-nitrophenyl)-4,4-diphenyl-1,4-dihydro-2H-3,1-benzoxazine and 2-(2-hydroxyphenyl)-4,4-diphenyl-1,4-dihydro-2H-3,1-benzoxazine (HL) were prepared by electrochemical and chemical syntheses. The complex formation involves the azomethine form of the ligand and gives a six-membered chelate cycle comprising deprotonated phenol and azomethine groups. The coordination entity has a planar structure with trans arrangement of the nitrogen and oxygen atoms.