I.I. Zherin

Halon 1301 synthesis by using fluoroxidants

This paper is devoted to the problems of application of alkali and alkaline-earth metal tetrafluorobromates in organic synthesis. The process of Halon 1301 synthesis, which is one of the best fire-extinguishing agents, is considered.

Synthesis and properties of lead nanoparticles

Lead nanoparticles were synthesized by the thermal decomposition of lead stearate in octanol. The nanoparticles were characterized by X-ray powder diffraction, thermal analysis, IR spectroscopy, and electron microscopy. The lead particle size can be controlled by both varying the concentration of lead stearate in octanol and changing the thermolysis time. Lead nanoparticles have an organic coat composed of decomposition products of lead stearate. This coat prevents the particles from oxidation in air and favors their dissolution in organic solvents.

Quantum chemical study of the structure and properties of isotopically pure lead chalcogenides

In the present work the theoretical methods B3LYP/SDD, GGA and BP86/TZ2P were used for quantum-chemical calculations of lead chalcogenides. It is shown that these levels of theory are applicable for assessment of their geometric parameters, Raman and IR spectra and thermodynamic characteristics. It is shown that there are correlations between the experimental and calculated characteristics of lead sulphide, selenide and telluride. The influence of different isotopes of lead, sulphur, selenium and tellurium on the thermodynamic parameters and the Raman spectra for the lead chalcogenides is shown.

Synthesis of Highly Deactivated Polyhalogenated Aromatic Compounds

The barium fluorobromate(III) was obtained as the product of interaction between barium fluoride and bromine(III) trifluoride. The heat of formation of Ba(BrF4)2 was found by isothermal calorimetry method. By the TG/DT analysis the thermal stability of Ba(BrF4)2 was researched. It was found that this compound is mostly stable in the atmosphere or argon up to 250 °C. It was shown that bromine trifluoride and its derive compounds with alkali and alkali-earth metals fluorides can be applied like a highly-active brominating agent in case of production of various composite materials based on polyhalogenated aromatics.

Fluorine distribution during thermal treatment of sulfuric acid leaching products of complex beryllium raw materials at JSC UMP

X-ray diffraction, infrared spectroscopy, thermogravimetry and mass spectrometry were employed to study the behavior and distribution of fluorine in sulfuric acid treatment of the melt of beryl-bertrandite-phenakite-fluorite concentrates with alkali fluxes. It was established that fluorine in a solid phase is predominantly present in the form of sodium and calcium fluorosilicates and in a gaseous phase it is evolved in the form of silicon tetrafluoride and fluorosulfonic acid.

Spectrophotometric Procedure for Fast Reactor Advanced Coolant Manufacture Control

The paper describes a spectrophotometric procedure for fast reactor advanced coolant manufacture control. The molar absorption coefficient of dimethyllead dibromide with dithizone was defined as equal to 68864 ± 795 lmole-1cm-1, limit of detection as equal to 0.583 10-6 g/ml. The spectrophotometric procedure application range was found to be equal to 37.88 - 196.3 g. of dimethyllead dibromide in the sample. The procedure was used within the framework of the development of the method of synthesis of the advanced coolant for fast reactors.

Study of sulfur isotopes by vibrational spectroscopy and quantum chemistry

The results show the dependence of the experimental and calculated frequencies in the IR- and Raman spectra from the molecular mass of the sulfur isotope. The effect of a sulfur isotope shifts on the change of thermodynamic parameters. The results obtained demonstrate that the quantum-chemical calculations are sensitive to the isotopic shifts in the vibrational spectra of sulfur isotopes and are able to assess changes in their thermodynamic properties.

Saturated Vapor Pressure in a System Constituted by Anthranilic Acid and Hydrogen Fluoride

The saturated vapor pressure in a system constituted by anthranilic (o-aminobenzoic) acid and hydrogen fluoride was studied by the static method in the temperature range 0-90°C. The isotherms of vapor pressure as a function of solution composition were approximated using the least-squares method.

Corrosion Resistance of Construction Materials in Liquid Bromine Trifluoride

Results obtained in studying gravimetrically and electrochemically the corrosion resistance of the most widely used construction metals and alloys in liquid bromine trifluoride BrF3 under steady-state conditions are presented.

Novel chemical and electrochemical methods of synthesis of o-fluorobenzoic acid and others fluoroorganic compounds

ortho-Fluorbenzoic acid (FBA) is useful product €or organic syntheses and preparation of some medicines. We have elaborated the following effective chemical methods for synthesis of FBA. i) Nucleophilic substitution of o-chlorobenzoic acid by action of KF in the presence of the crownethers or inter-phase catalysis; ii) Reaction of anthranilic acid with NaN02 into liquid HF with following thermal decomposition of the resulted diazonium salt at 100°C; iii) Fluorodecarboxilation of phthalic acid or its anhydride by heating in benzene in the presence of Pb(OAc)4 and CaF2. Also we have designed and produced of a special reactor for an electrochemical fluorination of various organic compounds. ,