Isotopically driven transitions in LaPrCaMnO system

The effect of oxygen isotope substitution on transport and magnetic properties is studied for (La_1−yPr_y)_0.7Ca_0.3MnO₃ ceramics and thin films. The temperature dependence of electrical resistivity reveals the metal–insulator transition induced by the ¹⁶O→ ¹⁸O substitution at y=0.75 (ceramics) and y=0.5 (films on LaAlO₃). Neutron powder diffraction at y=0.75 demonstrates a striking difference between magnetic structures in the samples with ¹⁶O and ¹⁸O. Measurements of AC magnetic susceptibility allow us to analyze the magnetic phase diagram and its changes related to the isotope substitution.     

Reactions of sulfenamides with alkynes in the presence of phosphorus(v) oxohalides

The reactions of alkynes with arylsulfenamides activated with phosphorus oxohalides giving rise to aryl β-halovinyl sulfides were investigated. The reactions with acetylene, oct-1-yne, and oct-4-yne aretrans-stereospecific, whereas the reaction with phenylacetylene afforded a mixture ofcis- andtrans-addition products. The addition to unsymmetrical alkynes yielded a mixture of Markovnikoff and anti-Markovnikoff isomers whose ratio depends on the solvent. Products of addition to oct-1-yne in the presence of catalytic amounts of acids underwent isomerization. Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 1874–1880, November. 2000.     

Reaction of sulfenamides withN,N-dimethylaniline in the presence of phosphorus(v) oxochloride

Reaction of arylsulfenamides withN,N-dimethylaniline in the presence of POCl₃ at room temperature affords unsymmetrical diaryl sulfide, onlypara-substitutedN,N-dimethylanilines being formed. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 178–179, January, 2000.     

First Investigation of the Inversion Rovibrational Spectrum of the 15NHD2 Molecule in the Region from 1100 to 1350 cm–1: the Fundamental ν5 Band

Russian Physics Journal - The high-resolution spectrum of the 15NHD2 molecule recorded in the Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), Paris Diderot University,...     

Complexes of Lanthanide (Dy,Er, Yb) Thiocyanates with Tetramethylphenanthroline. Synthesis,Thermolysis, and SMM Properties

Russian Journal of Coordination Chemistry - The mononuclear neutral complexes [Ln(Me4Phen)2(H2O)(NCS)3]·Me4Phen·0.75EtOH (Ln = Dy, Er, Yb) were prepared for the first time by the reaction...     

Studying the Accuracy and Applicability of the Finite Difference Scheme for Solving the Diffusion–Convection Problem at Large Grid Péclet Numbers

Journal of Applied Mechanics and Technical Physics - The work is devoted to studying a finite difference scheme for solving the diffusion–convection problem at large grid Péclet numbers....     

Vibrational–Rotational Analysis of the Hot 2ν2–ν2 Band of the 15NH2D and 15NHD2 Molecules

Optics and Spectroscopy - High-resolution spectra of the $$2{{\nu }_{2}}{-} {{\nu }_{2}}$$ hot band of the 15NH2D and 15NHD2 molecules are investigated for the first time. The analysis is carried...     

Separation and Concentration of Rare Earths by Recycling Liquid–Liquid Chromatography with Multiple Sample Injection: A Computational Study

Our computational studies into the separation of two- and three-component mixtures of rareearth salts by recycling liquid–liquid chromatography (RLC) with multiple sample injection show that this method considerably enhances metal separation efficiency and makes it possible to concentrate one of the components of mixture.     

Structure and energetics of β-diketonates. IX. Molecular structure of Sr(DPM)2 according to gas phase electron diffraction data

Simultaneous electron diffraction and mass spectrometric investigation of overheated vapor of strontium dipivaloyl methanate was carned out. It was found that at 437(5)°C one molecular form, Sr(DPM)₂, prevails in the vapor. The r_a, r_g, and r_α structural parameters of the Sr(DPM)₂ monomeric molecule were determined; the molecule was found to have D_2d symmetry. The structural characteristics are compared in the series Ca(DPM)₂—Sr(DPM)₂—Ba(DPM)₂.