Mass-spectrometric study of fluoroalkylated and fluoroacylated alkylamines,ethylenediamines, and propylenediamines

Conclusions The mass spectra of perfluoroacyl derivatives of diethylamine, ethylenediatnine-1,2, propylenediamine-1, 2 and propylenediamine-1,3 have been obtained and the main routes identified for the fragmentation of these compounds under electron impact, depending on the structure of the amine and the size of the perfluoroacyl or fluoroalkyl substituent of the NH₂ group.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 827–832, April, 1986.     

Effect of the displacement reaction on the composition of the magnetic layer in electrodeposited layered nanostructures Co-Cu/Cu and Ni-Cu/Cu

Methods of stripping voltammetry, quartz microgravimetry, and x-ray-fluorescence analysis are employed to explore the copper displacement process on thin electrodeposited layers of pure cobalt and nickel and on deposits of these metals with inclusions of copper. The displacement reaction proceeds at a considerable rate on cobalt in the sulfate and sulfosalicylate solutions and virtually does not proceed on nickel in both the sulfate or sulfate-chloride solutions. An estimate of the rate of the copper displacement reaction following a change in the concentration of copper ions in the solution and in the pH of the sulfosalicylate solution is given. A decrease in the contact exchange rate is facilitated by a decrease in the concentration of copper ions in solution and their participation in the formation of complexes.     

Insertion of Ethyl Isocyanate at the Tungsten–Chlorine Bond. Crystal Structure of 1,3,5-Triethyl-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione

The reaction of tungsten hexachloride with excess ethyl isocyanate in dichloroethane leads to the insertion of three ligand molecules at one of the tungsten–chlorine bonds. The data of elemental analysis and IR spectroscopy confirm that the thermolysis of the reaction mixture affords the WCl₄(L₃Cl) complex (I), where L = –N(Et)C(O)–. The structure of the chain of inserted molecules in I is established on the basis of IR and NMR data, and the results of X-ray diffraction analysis of crystals of an organic product (II) of the hydrolysis of I. According to the latter, compound (II) is a derivative of s-triazine—1,3,5-triethyl-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione.     

Catalytic Activity of Thallium, Lead, and Bismuth Adatoms in the Gold Dissolution Reaction in Cyanide Solutions: A Comparative Characterization

Quartz microgravimetry is used to determine the ratio between coefficients of mass transfer (1 : 0.54 : 0.48), which characterizes relative values of rates of diffusion of hydroxy complexes of thallium, lead, and bismuth in alkaline solutions. The ratio is used when refining the condition under which on a renewable electrode in solutions containing these ions at the concentration c _i the electrode coverage by relevant adatoms _i with increasing duration of contact of the electrode with solution reaches constant values: (c _Tl t) = (0.54c _Pb t) = (0.48c _Bi t). Measured are i,t curves on a renewable gold electrode at E = const in solutions containing 0.1 M KCN, 0.1 M KOH, 0.01 M KAu(CN)₂, and 8 × 10^–6 M compounds of thallium or 1.5 × 10^–5 M, lead, or 1.6 × 10^–5 M, bismuth. Shown is that at (, E) = const the currents of dissolution of gold in these solutions increase in the series Tl < Pb < Bi, which evidences an increase in this series of the catalytic activity of adatoms of these metals. Shown is that at = const the catalytic action of adatoms of thallium and bismuth has an approximately additive character. The obtained data are analyzed with allowance made for the explanation offered earlier for the catalytic effect of adatoms on the anodic dissolution of gold based on the hypothesis about the shift of the potential of the free zero charge in the negative direction after substituting a metal atom for chemisorbed cyanide ions.     

Transitions between fine-structure components in resonance interactions for alkali metals

The cross-section has been calculated for transitions between the fine-structure components of 2P_j=3/2 2P_j=1/2 for sodium in the excited 3P state consequent on collision with other sodium atoms in the ground state. It is usually assumed that dipole interaction is responsible for the transition, but it is found that this interaction varies too slowly to give the observed cross-section. A result of the correct order is obtained if exchange forces are included. Levels adiabatically separated by the dipole interaction are caused to intersect by the exchange forces, so the transition occurs.     

Fragmentation of alkyl esters of chlorine-substituted phosphonic acids under electron impact

Conclusions The main direction in the fragmentation of alkyl trichloromethylphosphonates, 7,7,7-trichloroheptylphosphonates, and p-trichloromethylphenylphosphonates depends on the presence and on the nature of the hydrocarbon fragment linking the trichloromethyl and phosphate groups.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1814–1818, August, 1981.     

Purification of magnesium chloride solution used for carnallite synthesis

The neutralization of magnesium chloride solutions and their treatment to remove iron compounds was studied. The possibility of neutralization of free hydrochloric acid with brucite was determined. The effect exerted by the method of stirring of the solution in the course of neutralization was analyzed, and variations of neutralization rate with the solution temperature and with the amount and size of particles of the neutralizing agent were studied.     

Fluctuations of the Multiplicity of Co3+ Ions and Softening of the Phonon Spectrum of Rare-Earth Cobalt Oxides

JETP Letters - An unconventional temperature dependence of infrared absorption spectra of rare-earth cobalt oxides LaCoO3 and GdCoO3 has been studied experimentally and theoretically in the...     

Effect of the Interatomic Exchange Interaction on the Magnetic Phase Transitions in Spin Crossover Systems under High-Pressure

The phase diagram of an antiferromagnet with the spin crossover from the high-spin to low-spin state with S = 0 with increasing external pressure has been calculated with regard to the pressure dependence of the exchange integral. The calculated results are compared with the experimental data on ferropericlase Fe_xMg_{1 – x}O.