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1.
It was found that the interaction of the modified paramagnetic defects SiO(CH2)
n
H2 (n = 0.1) with nitromethane on a thermochemically activated silica surface at 300 K results in the formation of the following nitroxyl radicals: SiO(CH2)
n
CH2ON(
)CH3 and SiO(CH2)
n
CH2N(
)CH3. It was suggested that these radicals are the products of two different reactions of the modified paramagnetic defects: the first results from a reaction with free nitromethane; the second, from a reaction with nitromethane bound as complexes with diamagnetic surface defects. 相似文献
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3.
N. A. Chumakova V. A. Nikitina V. I. Pergushov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2013,87(1):149-152
Values of the translational diffusion coefficient of a spin probe (2,2,6,6-tetramethyl-4-oxypiperidine-1-oxyl) are determined via cyclic voltammetry, chronoammetry, and EPR in ionic liquid (1-butyl-3methylimidazolium tetrafluoroborate) at 295 K. They are found to be (8 ± 3) × 10?12, (9 ± 3) × 10?12, and (11 ± 4) × 10?12 m2/s, respectively. 相似文献
4.
Sigolaeva L. V. Konyakhina A. Yu. Pergushov D. V. Kurochkin I. N. 《Moscow University Chemistry Bulletin》2021,76(5):334-342
Moscow University Chemistry Bulletin - Nanosized polymer-enzyme films were fabricated on graphite surfaces via a sequential two-stage adsorption of the pH- and thermoresponsive polymer, viz.,... 相似文献
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Photolysis of the alkylperoxy radicals ≡SiOCH2OO and ≡SiOCH2CH2OO grafted onto an activated surface of silica was found to be accompanied by photochemical radical chain reactions. 相似文献
7.
I. D. Sorokin V. I. Pergushov L. I. Savostina M. Ya. Melnikov 《High Energy Chemistry》2014,48(3):180-184
It has been established that transformations of azetidine radical cations observed in freonic matrices under the action of light with λ = 436 nm (T = 77 K) are associated with C-N bond cleavage which corresponds to the cyclic form yielding a mixture of open distonic C-centered radical cations of the following structure: ·CH2CH2CH=NH 2 + 相似文献
8.
L. Seetha Lakshmi V Sridharan DV Natarajan V Sankara Sastry T S Radhakrishnan 《Pramana》2002,58(5-6):1019-1026
Mn site is substituted with closed shell ions (Al, Ga, Ti, Zr and a certain combination of Zr and Al) and also with Fe and
Ru ions carrying the magnetic moment (S=5/2 and 2 respectively) at a fixed concentration of 5 at %. Substitution did not change either the crystal symmetry or the
oxygen stoichiometry. All substituents were found to suppress both the metal-insulator and ferromagnetic transition temperatures
(T
p(ρ) and T
C, respectively) to varied extents. Two main contributions identified for the suppression are the lattice disorder arising
due to difference in the ionic radii between the substituent (r
M) and the Mn3+ ion (r
Mn
3+) and in the case of the substituents carrying a magnetic moment, the type of magnetic coupling between the substituent and
that of the neighboring Mn ion. 相似文献
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A method of evaluating the quantum yield of stabilized radicals in solid phase molecular homolytic photodecomposition is suggested. The calculation is based on a free volume model. It is assumed that the radical escape from the matrix cage occurs only where a free volume larger than the volume of the fragment coming out of the cage is concentrated near the decomposed molecule. The available experimental data on the quantum yields of the stabilized radicals are in good agreement with the calculated ones. 相似文献