Synthesis and structure of copper(II) complexes with diaminodioxime (H<Subscript>2</Subscript>L), a derivative of the monoterpenoid (+)-3-carene

Copper(II) compounds with the optically active diaminodioxime (H₂L) derived from the monoterpenoid (+)-3-carene, Cu(H₂L)(NO₃)₂ H₂O (I), Cu(H₂L)(ClO₄)₂ H₂O (II), Cu(H₂L)Br₂ H₂O (III), and Cu(H₂L)SO₄0.5H₂O (IV) with µ_eff equal to 1.81, 1.79, 1.71, and 1.8 µ_B, respectively, were prepared. Studies of the complexes by IR and EPR spectroscopy showed that I and II are mononuclear ionic complexes. Compound III apparently has polymeric structure (the CuN₄Br₂ coordination unit). According to EPR data, the Cu²⁺ ions in polycrystalline compounds III and IV undergo exchange interactions.Translated from Koordinatsionnaya Khimiya, Vol. 30, No. 12, 2004, pp. 897–900.Original Russian Text Copyright © 2004 by Larionov, Myachina, Sheludyakova, Boguslavskii, Tkachev, Bizyaev.     

Synthesis and structure of optically active compounds [Ni(HL1)]NO3 and [Ni(HL2)]NO3H2O containing anions of diaminodioximes H2L1 and H2L2 derived from α-Pinene and (+)-3-Carene as Ligands

New optically active levorotatory compounds [Ni(HL¹)]NO₃ (I) and [Ni(HL²)]NO₃H₂O (II) containing the anions of chiral diaminodioximes, H₂L¹ and H₂L², derived from the terpenes ±-pinene and (+)-3-carene, respectively, were synthesized. Complexes I and II were studied by X-ray diffraction. The crystal structures of compounds are ionic, being composed of the [Ni(HL¹)]⁺ or [Ni(HL²)]⁺ cations and the outer-sphere NO₃^– anions. The Ni²⁺ ion coordinates four N atoms of the tetradentate chelating ligand, the NiN₄ coordination unit being shaped like a tetrahedrally distorted square. Compounds I and II are diamagnetic, which corresponds to a low-spin d⁸ configuration. The NMR spectra of compounds were recorded and analyzed.Translated from Koordinatsionnaya Khimiya, Vol. 30, No. 12, 2004, pp. 888–896.Original Russian Text Copyright © 2004 by Larionov, Myachina, Saveleva, Glinskaya, Klevtsova, Sheludyakova, Tkachev, Bizyaev.     

The dynamics of vortex sources in a deformation flow

This paper is concerned with the dynamics of vortex sources in a deformation flow. The case of two vortex sources is shown to be integrable by quadratures. In addition, the relative equilibria (of the reduced system) are examined in detail and it is shown that in this case the trajectory of vortex sources is an ellipse.     

Determination of the curie temperature of a single Ni nanowire from the analysis of current-voltage characteristics

A new method of measuring the Curie temperature of a single nanowire located on the surface of an insulating substrate has been proposed. The method is based on the analysis of the current-voltage characteristics of the nanowire obtained at different initial temperatures of the sample. A maximum is observed on the dependence of the first derivative of the resistance on the applied power, the position of which is shifted to lower powers with increasing initial temperature. The Curie temperature is determined graphically as the temperature at zero power. The Curie temperature of a nickel nanowire formed on a SiO₂/Si surface by the scanning probe lithography method has been measured. The critical current density at which the transition from the ferromagnetic to the paramagnetic state occurs has been determined.     

Syntheses of chiral fused 4,5-diazafluorene–bis(nopinane) derivatives

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Magnetization Distribution in Particles with Configuration Anisotropy,Prepared via Microsphere Lithography

Technical Physics - The arrays of permalloy particles with shape anisotropy, prepared via microsphere lithography, have been characterized using atomic force microscopy and magnetic force...     

Synthesis and structure of palladium(II) and copper(II) complexes with chiral bis-α-aminooximes containing (+)-3-carene or (+)-limonene fragments and 4,4′-methylenedianiline linker. Crystal structure of the complex [Cu(i-PrOH)Cl2(μ-H2L3)CuCl2·H2O]

Coordination compounds Pd₂(H₂L²)Cl⁴ (I), Cu₂(H₂L²)Cl₄ (II), Pd₂(H₂L³)Cl₄ (III), and Cu₂(H₂L³)Cl₄ (IV), where H₂L² and H₂L³ are chiral bis-α-aminooxime ligands consisting of (+)-3-carene or (+)-limonene fragments and 4,4′-methylenedianiline linker, were synthesized and examined by NMR, ESR, and IR spectroscopy. The structure of [Cu(i-PrOH)CL₂(μ-H₂L³)CuCL₂·H₂O] (V) was determined by X-ray analysis.     

The hierarchy of dynamics of a rigid body rolling without slipping and spinning on a plane and a sphere

In this paper, we investigate the dynamics of systems describing the rolling without slipping and spinning (rubber rolling) of various rigid bodies on a plane and a sphere. It is shown that a hierarchy of possible types of dynamical behavior arises depending on the body’s surface geometry and mass distribution. New integrable cases and cases of existence of an invariant measure are found. In addition, these systems are used to illustrate that the existence of several nontrivial involutions in reversible dissipative systems leads to quasi-Hamiltonian behavior.     

Locally induced charged polarization states in manganites

Spatially inhomogeneous states were induced on the surface of single-crystal lanthanum-strontium manganites by the local application of an external electric field. The dynamics of the growth and relaxation of these states were studied by atomic force microscopy. It is shown that the induced states possess a charge and reveal piezoelectric properties.