Stereochemical analysis by simplex representation of molecules

Stereoanalysis of molecules by partitioning a spatial structure into a system of simplices is described in detail. Potentialities of simplex representation of molecules in defining stereochemistry are demonstrated for chiral structures of various complexity and planar unsaturated molecules (“two-dimensional stereochemistry”). A concept of “stereochemical charge” is introduced. A. V. Bogatskii Physicochemical Institute, Ukrainian Academy of Sciences. Odessa State University. Translated fromZhurnal Strukturnoi Khimii, Vol. 39, No. 3, pp. 553–558, May–June, 1998.     

Thermal Decomposition in Systems of Acid Zn(II), Co(II), and Ni(II) Maleates with the Formation of Metallic Nanoparticles

Russian Journal of Physical Chemistry A - Conditions of synthesis are optimized and XRD and thermoanalytical studies are performed for normal maleate [Zn(H2O)2(C4H2O4)] and acid maleate...     

Regularities of thermolysis for the Fe(II), Co(II), and Ni(II) salts of maleic and ortho-phthalic acids with the formation of metal/polymer composites

Russian Journal of Coordination Chemistry - Regularities of the thermolysis of acidic salts of unsaturated (maleic) [M(H2O)4(C4H3O4)2] and aromatic (ortho-phthalic) [M(H2O)6](C8H5O4)2 (M = Fe(II),...     

Investigation of the KLu(WO<Subscript>4</Subscript>)<Subscript>2</Subscript> crystal as an acousto-optic material

A KLuW laser crystal is investigated as an acousto-optic material. It is shown that the crystal can be used in devices for controlling high-power laser radiation. Obtainable characteristics of promising classical devices (modulator, deflector) are estimated. A possibility of developing a new type of device for both lasing and Q-switching is analyzed.     

Properties of methylammonium lead iodide perovskite single crystals

The technique for growing CH₃NH₃PbI₃ single crystals from saturated solutions in concentrated hydroiodic acid is improved by introducing a reducing agent (hypophosphorous acid). The structure of perovskite is confirmed by single crystal XRD. By energy dispersive spectroscopy and X-ray photoelectron spectroscopy it is established that the stoichiometry of the grown crystals corresponds to the CH₃NH₃PbI₃ compound. Changes in the photoluminescence intensity during in-air measurements show that the crystals synthesized using the reducing agent are more stable in the external environment with laser exposure than without it.     

Molecular conductors with differently oriented conducting layers, (EDT-TTF)3Hg2Br6 and (TMBEDT-TTF)5Hg(SCN)4-xIx

New conducting radical cation salts (EDT-TTF)₃Hg ₂Br6, (TMET) ₅Hg(SCN) _4-xI_x (x≈0.35), and (EDT-TTF)₃Hg(SCN)₃I_0.5(PhCl)_0.5 were synthesized. Their conductivities, ESR and polarized reflectance spectra were studied. It was shown that the organic conductors with differently oriented conducting layers (EDT-TTF)₃Hg₂Br₆ and (TMET)₅Hg(SCN)_4-xI_x (x≈?0.35) are characterized by the quasi-one-dimensional character of electron motion. The conductivity along and across conducting layers has a semiconductive character. It was established by ESR and polarized reflectance spectroscopy that the properties of such conductors are a superposition of the properties of individual conducting layers.     

Transition-metal bimaleates and their solid solutions: Synthesis,structural, and thermoanalytical study

Transition-metal hydrogen maleates of composition M(C₄H₃O₄)₂ · 4H₂O, where M = Mn, Fe, Co, and Ni, and their solid solutions were synthesized and characterized by X-ray crystallography, IR spectroscopy, mass spectrometry, and thermal analysis. X-ray crystallography and IR spectroscopy showed that both intramolecular and intermolecular H-bonds exist in these compounds. The generation of continuous substitutional solid solutions with cation substitution in these compounds was studied. The thermolysis mechanism was studied for both transition-metal hydrogen maleates and their solid solutions. The composite produced by thermolysis is stable up to 1200°C in flowing helium.     

Structure of crystals of inorganic coordination compounds with complex ions [Ma5X] and [MX5A], containing neutral (A) and acid (X) ligands,at very high packing densities

Dedicated to the memory of our teacher, the great N. V. Belov (on the centenary of his birth).