Synthesis and Structure of Tetraphenylantimony Methacrylate and Tetraphenylantimony Crotonate and Their Use for the Production of Antimony-Containing Polystyrene

Russian Journal of General Chemistry - Tetraphenylantimony methacrylate Ph4SbO2CC(CH3)=CH2 and tetraphenylantimony crotonate Ph4SbO2CCH=CHCH3 were synthesized by the action of acids on Ph5Sb or on...     

Phase diagram of BaCl<Subscript>2</Subscript>-NaCl-H<Subscript>2</Subscript>O at temperatures up to 530°C and pressures up to 150 MPa

Experimental studies of high-temperature phase equilibria in the BaCl₂-NaCl-H₂O made it possible to determine the conditions of heterogenization of homogeneous supercritical (SC) fluids spreading from the BaCl₂-H₂O binary subsystem of type 2 and to reveal the continuity of the transformation of gasliquid equilibria into equilibria of phase separation in SC environment. Comparison with the characteristics of the K₂SO₄-KCl-H₂O system suggests that ternary systems with one volatile component formed by binary subsystems of type 2 with phase separation and of type 1 without separation have the same type of phase diagrams.     

X-Ray Diffraction Study of New Organic Compound n-Tol3Sb[OC(O)CH=CHPh]2

Crystallography Reports - The bis[(2E)-3-phenylprop-2-enoate]-tris(п-tolyl)antimony n-Tol3Sb[OC(O)CH=CHPh]2 complex is obtained as a result of interaction of tri-n-tolylantimony, hydrogen...     

Basic patterns of the generation of high-angle grain boundaries and the physical and mechanical properties of FeNi alloys upon severe plastic deformation

The evolution of the structural parameters of deformation fragments and dynamically recrystallized grains in FeNi alloy are analyzed by means of transmission electron microscopy and back-scattered electron diffraction in a Bridgman camera upon severe plastic deformation with an increase in the number of full turns at a room temperature. It is found that the formation of a great many high-angle grain boundaries in the structure is associated with low-temperature dynamic recrystallization.     

Synthesis of disperse graphene-like materials and their structural and electrochemical characteristics

Graphene-like materials of oxidized graphite (OG) were obtained by boiling in ethylene glycol, microwave treatment of a suspension of OG in ethylene glycol, and microwave treatment of dry OG without using solvents. The obtained materials were characterized by X-ray photoelectron spectroscopy (XPS), IR spectroscopy, atomic force microscopy, elemental analysis, and electrochemical measurements. Microwave treatment of dry OG gave the most disperse material (～400 m²/g) with an oxygen content of no more than 20%. Treatment in 0.5 M H₂SO₄ for 50 h at 60°C in oxygen did not lead to oxidation and was accompanied by an increase in the dispersity of this material.     

Nature of high-angle grain boundaries in metals subjected to severe plastic deformation

The evolution of structural parameters of deformation fragments and dynamically recrystallized grains during severe plastic deformation in a Bridgman chamber as the number of complete revolutions in torsion at room temperature increases is analyzed using transmission electron microscopy and electron backscattered diffraction. It is found that the formation of a significant amount of high-angle grain boundaries in the structure is caused not by deformation fragmentation but by the low temperature dynamic recrystallization.     

Heteroleptic LaIII Anilate/Dicarboxylate Based Neutral 3D-Coordination Polymers

Three new 3D metal–organic frameworks of lanthanum based on mixed anionic ligands, [(La₂(pQ)₂(BDC)₄)·4DMF]_n, [(La₂(pQ)₂(DHBDC)₄)·4DMF]_n, [(La₂(CA)₂(BDC)₄)·4DMF]_n (pQ—dianion of 2,5-dihydroxy-3,6-di-tert-butyl-para-quinone, CA—dianion of chloranilic acid, BDC-1,4-benzenedicarboxylate, DHBDC-2,5-dihydroxy-1,4-benzenedicarboxylate and DMF-N,N′-dimethylformamide), were synthesized using solvothermal methodology. Coordination polymers demonstrate the rare xah or 4,6T187 topology of a 3D framework. The homoleptic 2D-coordination polymer [(La₂(pQ)₃)·4DMF]_n was obtained as a by-product in the course of synthetic procedure optimization. The thermal stability, spectral characteristics and porosity of coordination polymers were investigated.     

Azamacrocyclic complexes of Group VIII metals as catalysts for oxygen electroreduction in alkaline solutions

The kinetics of catalytic electroreduction of oxygen in a 1 N KOH solution was studied by the rotating disk electrode (RDE) method. Azamacrocyclic iron and ruthenium complexes of the porphyrin and phtalocyanine series were used as catalysts. The reduction of oxygen was also studied on both the individual complexes and the same complexes supported on carbon supports (XC72R and graphene). The catalytic activity and selectivity of the complex is determined, to a high extent, by the nature and electron-donor properties of the metal atom in the complex and, to a lesser extent, by the structure of the organic ligand.