Reactivity of the [(η5-Cp)V(μ2-η6:η2-C10H8)Yb(THF)(μ2-η5:η5-Cp)] n complex

The interactions of the CpVC₁₀H₈Yb(THF)Cp complex with H₂O, CO, CO₂, Cr(CO)₆, CpTl, azobenzene, and other reagents are followed by the breaking of the bond between ytterbium and the naphthalene ligand. The reaction of CpVC₁₀H₈Yb(THF)Cp with H₂O leads to CpYbOH(THF)₂ and CpVC₁₀H₈ formation. Ytterbocene, CpVC₁₀H₈ and insoluble carboxylates are isolated as a result of the interaction of CpVC₁₀H₈Yb(THF)Cp with CO and CO₂. The reaction of CpVC₁₀H₈Yb(THF)Cp with an equimolar amount of Cr(CO)₆ proceeds not onlyvia the breaking of the C₁₀H₈–Yb bond, but is followed by the destruction of the CpVC₁₀H₈ fragment to form Cp₂Yb, Cp₂V, CpVC₁₀H₈, CpVC₁₀H₈VCp, and C₁₀H₈. Under mild conditions, the reaction of CpVC₁₀H₈Yb(THF)Cp with CpTl occurs leading to the formation of Cp₂Yb and CpVC₁₀H₈ in high yield. The diphenylhydrazine complex of ytterbium [CpYb(THF)]₂[Ph₂N₂]₂ is isolated in the reaction of CpVC₁₀H₈Yb(THF)Cp with azobenzene.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1470–1472, August, 1993.     

Hall effect of gadolinium,terbium, and dysprosium films

We investigate the ordinary Hall effect of polycrystalline films of gadolinium, terbium, and dysprosium in the paramagnetic, ferromagnetic, and antiferromagnetic regions. We determine the classical (R₀) and spontaneous (R_S) Hall constants, and the signs of the carriers in films of different thicknesses.Translated from Izvestiya Vysshikh Uchefanykh Zavedenii, Fizika, No. 12, pp. 72–75, December, 1970.     

Nonlinear Summation of Power Series and Exact Solutions of Evolution Equations

The technique of quadratic and cubic summation of power series in the perturbation method was first used for finding exact solutions to nonlinear evolution equations. The series were construction with the use of exponential partial solutions to linearized equations. The solution of both classic and modified nonintegrable Korteweg-de Vries equations, the modified Burgers equation, and the Fisher one allows one to demonstrate specific features of the mentioned method. We obtain exact solitary wave solutions to the mentioned equations in the form of a wave impulse and a wave front and show that summation parameters depend on the pole orders of the desired solutions.     

Emission of dimers from the substrate during vacuum deposition of thin films

Emission of dimers from the substrate to the vapor medium during silver vapor deposition onto an ideal substrate is calculated. Dimers are demonstrated to form on the substrate owing to random collisions of atoms during their surface migration, and emission of dimers is caused by thermal fluctuations of the crystal lattice of the substrate. Calculations based on Langmuir’s modified model of sorption show that emission mainly occurs at the stage of filling of the first atomic layer on the substrate and in regimes of “condensation failure” when intense condensation does not occur even at high levels of supersaturation and nucleation frequency because of the low energy of bonding of vapor atoms with the substrate. A relation of emission of dimers to the intensity of condensation and condensate microroughness on the substrate is found.     

Dinuclear copper(I) complexes with substituted benzimidazole ligands. Synthesis and photo- and electroluminescent properties

New dinuclear copper(I) complexes with bridging bis-diimine ligands were synthesized on the basis of benzimidazole derivatives. The obtained complexes showed photo- and electroluminescent properties. Copper-containing emitters exhibited yellow, orange, and yellow–green electroluminescence with a maximum brightness of 1166 cd/m².     

The ruthenium pyrazolonate complex Ru(PMIP)2(PPh3)2: Synthesis, structure, and some properties

The new ruthenium(II) complex Ru(PMIP)₂(PPh₃)₂ (HPMIP is 4-isobutyryl-3-methyl-1-phe-nylpyrazol-5-one) was obtained from RuCl₂(PPh₃)₃ and Na(PMIP)(DME) (DME is dimethoxyethane). The structures of the complex obtained and the starting sodium pyrazolonate were determined by X-ray diffraction. The ruthenium pyrazolonate complex initiates metathetical norbornene polymerization producing high-molecular-weight polynorbornene in low yield.