Synthesis and complexing properties ofcis,cis-1,3,5-tri-[2-(diphenylphosphinyI)ethylamino]cyclohexane

A novel polydentate phosphorus-containing complexing agent,cis,cis-1,3,5-tri[2-(diphenyl-phosphinyl)ethylamino]cyclohexane, has been prepared on the basis ofcis,cis-1,3,5-triamino-cyclohexane. The method of potentiometric titration in an aqueous—organic medium (70% ethanol, ionic strength 0.01M LiNO₃, 298 K) has been used to study the acid-base and complexing properties of the title compound. The ligand thus prepared forms 11 complexes with Cu²⁺, Co²⁺, Zn²⁺, and Ni²⁺ cations; formation of hydroxocomplexes MOHL⁺ has been observed in the case of Zn²⁺ and Cd²⁺.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1276–1279, July, 1993.The authors are grateful to A. G. Matveeva for his assistante in discussing the results of this study and in preparing this paper.     

Nitration equilibrium of water-soluble carboxycellulose

Maximum and minimum values of the equilibrium constants for nitration of hydroxyl groups in water-soluble carboxycellulose (WSCC) have been estimated. Electronegative substituants and elements of the cellulose structure in the WSCC molecule substantially lower the equilibrium constants for nitration compared with those for polyatomic aliphatic alcohols.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2254–2258, October, 1991.     

Preparation and properties of secondary amides of 1,1-dinitroalkanecarboxylic acids

The previously unknown secondary amides of 1,1-dinitroalkanecarboxylic acids were prepared by the reaction of polynitroimidoyl fluorides with water in the presence of mineral acids. They are inert with respect to electrophiles, but react with nucleophiles with the cleavage of the C-C bond between the carbonyl C atom and the C atom of the dinitromethylene group. An X-ray structural study of the amides was carried out and their thermochemical characteristics were determined.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 877–881, May, 1994.     

Effect of Lanthanide Additives to a Nickel Oxide Electrode of a Sealed Nickel-Zinc Battery on the Self-Discharge and Hydrogen Pressure

The influence exerted by addition of a nickel-based alloy containing lanthanides (La, Ce, Nd, Pr) to the active paste of a nickel oxide electrode on the self-discharge and hydrogen pressure in a sealed nickel-zinc battery was studied.     

Kinetic Investigation of Unusual Arbuzov Reaction

Abstract

3,4-Dichloro-5-hydroxyy-2(5H)furanone (mucochloric acid) (I), which may exist in two (cyclic and acyclic) forms, reacts with trialkylphosphites under mild conditions to form two products, one and the most interesting of which is (II). Kinetic study if this process has shown the following reaction mechanism which is an unusual Arbuzov reaction with the elimination of HCl (but not RCl) from the intermediate (A):     

Absorption coefficient versus induced electric field dependence as a basis for optical bistability in a semiconductor

Using computer simulation, the feasibility of absorption optical bistability based on the dependence of the absorption coefficient on an electric field induced by a high-intensity laser pulse acting on a semiconductor and shifting the energy levels of atoms is demonstrated. Unlike the known mechanisms behind absorption optical bistability, here enhanced diffusion of charged particles does not change the rate of switching the system from the lower to upper state. Radiation-semiconductor interaction conditions are found when, after being switched to the upper state, the system remains in it until the laser pulse disappears.     

Influence of the Method of Boron Introduction on the Formation and Activity of Hydrotreatment Catalysts

Kinetics and Catalysis - Experimental data on the effect of the method of introducing boron and Ni(Co) and Mo compounds on the physicochemical properties and hydrodesulfurization activity of...     

Dielectric constant and dielectric relaxation in aqueous solutions of K<Subscript>2</Subscript>[PdCl<Subscript>4</Subscript>] and K<Subscript>2</Subscript>[PtCl<Subscript>4</Subscript>]

The MW-dielectric properties of aqueous solutions of K₂[PtCl₄] (I) and K₂[PdCl₄] (II) were studied at 298 and 313 K in the frequency range (12–25 GHz) corresponding to the maximum dielectric constant dispersion for water and aqueous solutions of these salts. The low-frequency conductivities were measured. The static dielectric constant, the dielectric relaxation time, and the enthalpy of activation of the dielectric relaxation of the solutions were determined. Compared to pure water, in solutions of salts I and II, the orientational mobility of water molecules is increased and the network of H-bonds is violated more strongly than that of most other ions with hydrophilic hydration. It was demonstrated for the first time that dielectric spectroscopy can be used for analyzing complexation processes in systems containing aqua and hydroxo chloride complexes of metals.