A new chemiluminescence emitter in the hydroquinone-inhibited reaction of cumene oxidation by oxygen

A new chemiluminescence emitter was detected in the hydroquinone-inhibited reaction of homolytic oxidation of cumene by oxygen. The emission band lies in the range (22-18)·10³ cm^–1, which corresponds to an energy of 230 kJ/mole between levels. It is suggested that this emitter is p-benzoquinone, formed in the reaction between the phenoxyl and peroxy radicals.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 30, No. 2, pp. 103–107, March–April, 1994.     

N-oxides of 2- and 4-azafluorenones and nitro derivatives of 2- and 4-azafluorenes

It was demonstrated by PMR spectroscopy that mixtures of N-oxides of 6- and 7-nitro derivatives are formed in the nitration of the N-oxides of 3-methyl-2- and 4-azafluorenes. The products were deoxygenated to give nitro derivatives of 2- and 4-azafluorenes. The N-oxides of nitro-substituted azafluorenes were converted to salts of the aci forms by the action of alkali.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1396–1399, October, 1982.The authors thank K. F. Turchin for his assistance in recording the spectrum of nitration product VI at 200 MHz.     

Haloacrylic acids XI. Photochemical reactions of aliphatic aldehydes with methyl trifluoroacrylate

Photochemically initiated reactions of aliphatic aldehydes, namely acetaldehyde, propionaldehyde and butyraldehyde, with methyl trifluoroacrylate afforded γ-ketoesters of the type R-CO-CF₂CHF-COOCH₃ in the liquid phase. In the gas phase reaction further products were formed by addition of the aldehyde fragments to the olefinic bond of the methyl trifluoroacrylate.     

Growth and Study of Scintillation Properties of BaBrI Crystals Activated by Samarium Ions

Physics of the Solid State - BaBrI crystals activated by Sm2+ ions were synthesized by the Bridgman method. The Sm content in the samples was analyzed by the method of mass spectrometry with...     

Ab initio study of alkaline-earth halide scintillators doped with Eu<Superscript>2+</Superscript> ions

The results from ab initio quantum chemical calculations for inorganic scintillators BaBrI:Eu²⁺ and BaСlI:Eu²⁺ are presented. The calculations were performed using the density functional theory and the VASP software package. Estimates are made for the band-gap width of the crystals, and for the locations of 4f- and 5d-levels of Eu²⁺ ions with respect to the valence and conduction bands, respectively, and the possibility of using a new material based on BaСlI:Eu²⁺ as a scintillator is evaluated.     

Growing of Alkaline Earth Halide Scintillation Crystals and Their Optical Properties

Physics of the Solid State - The features of using the Bridgman method for growing alkaline earth halides crystals BaBrI, BaClI, and SrBrI are discussed. The results of the study of scintillation...     

Quantum-chemical DFT calculations of the energies of the O—H bond of phenols

The energies of homolytic cleavage of the O—H bonds in 36 phenols with various structures were calculated within the scope of density functional theory using a series of exchange-correlation functionals and basis sets. The best agreement between the calculated and experimental data is given by the M06-2X/6-311++G(2d,2p)//B3LYP/6-31G(d) method.     

Optical and luminescence properties of single crystals of LiF:Cu and LiF:Mg,Cu

Results from spectral studies of the optical and luminescent properties of single crystals of lithium fluoride grown using the Czochralski technique and doped with ions of copper and magnesium, are presented. The effect of heat treatment regimes and the dependence of the concentration of magnesium impurities on the sensitivity of crystals of LiF:Mg, Cu to ionizing radiation are discussed.     

Development of the specific surface areas of natural coal in the course of thermolysis in the presence of potassium hydroxide

The development of the surface of natural coal from Donets field in the course of thermolysis with KOH was studied. The dependences of the specific surface area of coal containing 90% carbon on the activation time, temperature (400–800°C), and KOH/coal ratio (0.75–4.5 g g^–1) were determined. The effect exerted on the development of the porous coal structure by low-temperature (20±2°C) oxidative modification causing formation of oxygen functional groups and reorganization of the coal three-dimensional structure was studied.Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 9, 2004, pp. 1452–1455.Original Russian Text Copyright © 2004 by Tamarkina, Kucherenko, Shendrik.