Kinetics of oxidation of fullerene C60 with dimethyldioxirane

The kinetics of the reaction of dimethyldioxirane with fullerene C₆₀ was studied, and the activation parameters logk = (8.3±0.8) – (14.2±0.9)/, ( = 2.3RT kcal mol^–1) (20—45°C) were determined. The formation of paramagnetic particles was detected.     

ESR studies of radical breakdown for di-t-butyl trioxide

ESR data show thermal breakdown of the title trioxide into peroxy and alkoxy radicals ROO^. and RO^., respectively. Equilibrium constants were calculated for the formation of tetroxide ROOOOR from two peroxy radicals. Their thermodynamic parameters were determined at temperatures ranging within 193–173 K.     

Generation of K-Shell Radiation of Noble Gases in the Microsecond Implosion Regime

Russian Physics Journal - Studies of K-shell plasma radiation sources were performed on the GIT-12 generator (4.7 MA, 1.7 μs). In the experiments, a new type of load configuration was used to...     

Sulfophthalide cycle cleavage and formation of fluorenyl structures upon poly(diphenylene sulfophthalide) thermolysis

Thermolysis of poly(diphenylene sulfophthalide) (PDSP) in the temperature range from 100 to 500 °C was studied by IR and UV-Vis spectroscopy and thermogravimetric analysis. A series of absorption bands in the IR spectrum of PDSP were assigned on the basis of the theoretical calculations of the IR spectrum of diphenyl sulfophthalide used as a model compound, in particular, ν_as(S=O) = 1352 cm^?1, ν_s(S=O) = 1196 cm^?1, ν(C-O) ～ 920 cm^?1, ν(S-O) = 824 cm^?1, and δ(SO₂) = 576 cm^?1. The sulfophthalide cycle (SPC) in PDSP decomposes at the thermolysis temperatures in a range of 260–400 °C. An analysis of the IR spectra of the thermolyzate and the quantum chemical calculations of the IR spectra of the model compounds confirmed the predominant formation of fluorenyl structures in the thermolyzed polymer. The changes in the UV-Vis spectra observed upon the thermolysis of thin films of PDSP (the hypsochromic shift of the long-wavelength absorption band from 271 to 263 nm and the appearance a shoulder at ～310 nm) and the results of TD-DFT calculations of the UV-Vis spectra of the model compounds are consistent with the hypothesis about the formation of fluorenyl structures. The general scheme of PDSP thermolysis at 260–400 °C was proposed in which the major process is the formation of fluorenyl fragments in macromolecules of the polymer due to the intramolecular ring closure in biradicals formed by the SPC cleavage.     

Determination of the mass of an imploding gas puff

A method for determination of the mass of an imploding gas puff with the use of piezoelectric gages has been proposed and tested. The data obtained in this experiment are compared with those obtained by the method of laser interferometry of gas. The measurement results of both experimental sets are in good agreement within the operating range of delays between the opening of the gas valve and the operation of the current generator. Institute of High Current Electronics, Siberian Branch of the Russian Academy of Sciences. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 72–74, December, 1999.     

Chemiluminescence of the 9,10-anthrasemiquinone radical ion during autooxidation of 9,10-dibromoanthracene in the diphenylmethane-ButOK-DMSO system

Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 189–190, January, 1995.