Anisotropy of Ionic Conductivity of TbF3 Crystals

Crystallography Reports - Temperature measurements (in the range of 375–830 K) of the ionic conductivity of terbium trifluoride single crystals (structure type β-YF3) along three...     

Synthesis of N(1)-substituted 5-amino-3-methylpyrazoles

With the aim of preparing new biologically active compounds a series of N₍₁₎-substituted 5-amino-3-methylpyrazoles has been obtained from -aminocrotononitrile and mono-substituted hydrazines.K. A. Timiryazev Moscow Agricultural Academy, Moscow 127550, Russia. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, 342–344, March, 2000.     

AM1 studies of photoelectron spectra

Five ionization potentials for thesp,ac andsp, sp conformers of (acetylthiomethyl)trifluorosilane MeC(O)SCH₂SiE₃ and six ionization potentials for the same conformers of (benzoylthiomethyl)trifluorosilane PhC(O)CH₂SiF₃ were calculated by the semiempirical AM1 method. The resulting values are in good agreement with the data of photoelectron spectroscopy only for thesp.ac conformers. The structure of the preferred conformer of (acetylthiomethyl)trifluorosilane was confirmed by measurement of its dipole moment in the gas phase. The influence of the long-range inductive effect (field effect) on the energy of nonbonding electrons of the carbonyl oxygen atom in the series of acetic acid derivatives was observed. For Part 9, see Ref. 1. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 236–241, February, 1998.     

(Butylsulfanyl)ethanal and 3-(Organylsulfanyl)butanal 1,1-Dimethylhydrazones

Previously unknown (butylsulfanyl)ethanal and 3-(organylsulfanyl)butanal 1,1-dimethylhydrazones were synthesized. Their reactivity toward methyl iodide was studied.__________Translated from Zhurnal Obshchei Khimii, Vol. 75, No. 6, 2005, pp. 945–953.Original Russian Text Copyright © 2005 by Sorokin, Lopyrev, Voronkov.     

Electron beam formation in an anomalous glow discharge

Scaling parameters that account for the efficient formation of electron beams in sources based on an anomalous glow discharge are considered, and the processes leading to the violation of scaling laws are analyzed. Estimates show that the working pressure range in such sources can be increased significantly. The results obtained can be used to optimize discharge regimes with required electron beam parameters. It is demonstrated that sources with plane-parallel continuous electrodes can operate at pressures as high as 100 Torr (which is one to two orders of magnitude higher than that in similar existing electron beam sources), provided that parasitic spark breakdowns at the insulator near the discharge cathode are suppressed. The sources designed can be used for direct excitation of laser working media or their preionization by soft X-rays.     

Polar properties of Langmuir-Blodgett films of copper phthalocyanines

Langmuir-Blodgett films of amphiphilic copper phthalocyanines are obtained. The Stark effect spectra and the spectra of pyro-and photosensitivity of these films are investigated. The following molecular parameters are determined: changes in the polarizability and the dipole moment for individual absorption bands in the Langmuir-Blodgett films and in an isotropic polymer solution. It is shown that the films obtained have photosensitivity due to the charge transfer in the spectral range 600–900 nm. The pyroelectric effect was observed, which indicates that the films have a polar structure.     

The vortex state of an antiferromagnet with uniaxial anisotropy

For the model of an antiferromagnet with easy-axis anisotropy, we have determined the multisoliton state that corresponds to the domain boundary on the surface of which antiferromagnetic vortices of various topological charges are localized. We analyze the pattern of interaction between the vortices. We show that repulsive and attractive forces equivalent to the forces of electrostatic interaction between point charges in a plane act between the vortices with like and unlike topological charges, respectively. However, there is a steady state in this case, since these vortices in the model of a uniaxial antiferromagnet have an infinite effective mass and do not change their relative positions. We give a general solution that describes the vortex structures on the surface of the domain boundary.     

C-acylation of pyrazole and its derivatives byo-chlorobenzenesulfonylisocyanate

N-Substituted pyrazoles with a free 4-position on the ring and not containing electron-acceptor substituents easily react with o-chlorobenzenesulfonylisocyanate according to an electrophilic substitution scheme, forming 4-o-chlorobenzenesulfonylcarbamoyl derivatives.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 210–213, February, 1996.