ELECTROCHEMICAL PRODUCTION OF BROMINE BY ELECTROLYSIS OF IRON BROMIDE SOLUTION

The effect of the concentration of the iron bromide solution on the power consump tion and bromine yield is studied. It was found that with a decrease in the concentration of the solution, the energy consumption decreases and the completeness of the reduction and oxidation reactions increases.

An analysis of composition of the layers formed under CVD of tantalum on stainless steel substrates

Interaction of the reagents and the substrate stainless steel was analyzed during the deposition of tantalum coatings by reduction of tantalum bromide with cadmium. It was found that at deposition temperatures above 1000 K, the iron and chromium contents in stainless steel will reduce tantalum pentabromide passing into the gas phase in the form of bromides. As a result, not only tantalum bromide is reduced on the substrate, but also iron bromide which in the initial stages of deposition leads to the formation of iron containing sublayer in the coating. An increase in the contact surface of stainless steel interacting with reagents leads to an increase in the content of iron bromide, in which case a coating is formed from a Ta + Fe2Ta mixture. In addition, chromium bromide is formed on the substrate, which is removed along with the rest of the reaction products. It causes chromium depletion in the surface layers of steel.

An [FeIII34] Molecular Metal Oxide

The dissolution of anhydrous iron bromide in a mixture of pyridine and acetonitrile, in the presence of an organic amine, results in the formation of an [Fe34] metal oxide molecule, structurally characterized by alternate layers of tetrahedral and octahedral Fe(III) ions connected by oxide and hydroxide ions. The outer shell of the cage is capped by a combination of pyridine molecules and bromide ions. Magnetic data, measured at temperatures as low as 0.4 K and fields up to 35 T, reveal competing antiferromagnetic exchange interactions; DFT calculations showing that the magnitudes of the coupling constants are highly dependent on both the Fe-O-Fe angles and Fe-O distances. The simplicity of the synthetic methodology, and the structural similarity between [Fe34], iron oxides, previous Fe(III)-oxo cages, and polyoxometalates (POMs), hints that much larger, molecular Fe(III) oxides can be made.<br>

An [FeIII34] Molecular Metal Oxide

The dissolution of anhydrous iron bromide in a mixture of pyridine and acetonitrile, in the presence of an organic amine, results in the formation of an [Fe34] metal oxide molecule, structurally characterized by alternate layers of tetrahedral and octahedral Fe(III) ions connected by oxide and hydroxide ions. The outer shell of the cage is capped by a combination of pyridine molecules and bromide ions. Magnetic data, measured at temperatures as low as 0.4 K and fields up to 35 T, reveal competing antiferromagnetic exchange interactions; DFT calculations showing that the magnitudes of the coupling constants are highly dependent on both the Fe-O-Fe angles and Fe-O distances. The simplicity of the synthetic methodology, and the structural similarity between [Fe34], iron oxides, previous Fe(III)-oxo cages, and polyoxometalates (POMs), hints that much larger, molecular Fe(III) oxides can be made.<br>

Raman Spectroscopy Study of the Doping Effect of the Encapsulated Iron, Cobalt, and Nickel Bromides on Single-Walled Carbon Nanotubes

In this contribution the modification of the electronic properties of single-walled carbon nanotubes (SWCNTs) filled with nickel bromide, cobalt bromide, and iron bromide was studied by Raman spectroscopy. The doping-induced alterations of the radial breathing mode (RBM) and G-mode in the Raman spectra of the filled SWCNTs were analyzed in detail. The observed shifts of the components of the Raman modes and changes of their profiles allowed concluding that the embedded compounds have an acceptor doping effect on the SWCNTs, and the doping level increases in the line with nickel bromide-cobalt bromide-iron bromide.