scholarly journals A.S. Masalimov as the founder and leader of a new direction in ESR spectroscopy and quantum chemistry of free radicals

2021 ◽  
Vol 104 (4) ◽  
pp. 5-8
Author(s):  
S.N. Nikolskiy ◽  
◽  
I.A. Pustolaikina ◽  
Keyword(s):  
Free Radicals ◽  
Quantum Chemistry ◽  
Esr Spectroscopy ◽  
70Th Anniversary ◽  
Scientific Career ◽  
Significant Events

The article highlights the creative path of A.S. Masalimov, an outstanding Kazakhstan chemist who celebrates his 70th anniversary in 2022. The main stages of his career and significant events of his scientific career are presented here. The contribution of professor A.S. Masalimov in the foundation and development of the school of ESR spectroscopy and quantum chemistry at the Karaganda Buketov University is shown.

The effect of cation concentration on the nitrogen splitting constant of nitroxide free radicals

1990 ◽  
Vol 55 (10) ◽  
pp. 2377-2380
Author(s):  
Hamza A. Hussain
Keyword(s):  
Hydrogen Peroxide ◽  
Hydrogen Bonding ◽  
Free Radicals ◽  
Esr Spectroscopy ◽  
The Other ◽  
Tetraethylammonium Bromide ◽  
Splitting Constant ◽  
The One ◽  
Positively Charged ◽  
Two Equilibria

Nitroxide free radicals prepared from diethylamine, piperidine and pyrrolidine by oxidation with hydrogen peroxide were studied by ESR spectroscopy. The changes in the 14N splitting constant (aN) caused by the addition of KBr or tetraethylammonium bromide were measured in dependence on the concentration of the ions. For diethylamine nitroxide and piperidine nitroxide, the results are discussed in terms of two equilibria: the one, involving the anion, is associated with a gain or loss of hydrogen bonds to the nitroxide oxygen atom, the other is associated with the formation of solvent shared units involving the cation, which results in changes in the hydrogen bonding strenght. The large increase in the aN value in the case of pyrrolidine nitroxide is explained in terms of an interaction from one side of the positively charged N atom; the increase in aN in the case of diethylamine and piperidine nitroxides is explained in terms of interactions with both sides of the positively charged N atom.

Investigation of free radicals induced by light ions in CR-39 using ESR spectroscopy

2005 ◽  
Vol 40 (2-6) ◽  
pp. 218-223 ◽  
Author(s):  
S. Böhlke ◽  
D. Hermsdorf ◽  
J. Sichelschmidt ◽  
S. Starke
Keyword(s):  
Free Radicals ◽  
Esr Spectroscopy ◽  
Light Ions

scholarly journals Novel free radicals in synthetic and natural pheomelanins: distinction between dopa melanins and cysteinyldopa melanins by ESR spectroscopy.

1982 ◽  
Vol 79 (9) ◽  
pp. 2885-2889 ◽  
Author(s):  
R. C. Sealy ◽  
J. S. Hyde ◽  
C. C. Felix ◽  
I. A. Menon ◽  
G. Prota ◽  
...  
Keyword(s):  
Free Radicals ◽  
Esr Spectroscopy

Structural features of 1,3,5-trifluorobenzene radical anion, as studied by optically detected ESR spectroscopy and quantum chemistry

2013 ◽  
Vol 62 (11) ◽  
pp. 2311-2316 ◽  
Author(s):  
S. V. Blinkova ◽  
M. M. Vyushkova ◽  
L. N. Shchegoleva ◽  
I. V. Beregovaya ◽  
V. A. Bagryansky ◽  
...  
Keyword(s):  
Quantum Chemistry ◽  
Radical Anion ◽  
Esr Spectroscopy ◽  
Structural Features ◽  
Optically Detected

scholarly journals Fieldworker, researcher, teacher (to the 70th anniversary of Yuri Ilyich Sheikin)

2019 ◽  
pp. 99-103
Author(s):  
G. E. Soldatova
Keyword(s):  
Far East ◽  
70Th Anniversary ◽  
Significant Events ◽  
The Far East

The article is written in honor of the anniversary of the outstanding ethnomusicologist, doctor of art, Professor Yuri Ilyich Sheikin. The whole life of Y. I. Sheikin is connected with the study and promotion of musical folklore of the in-digenous peoples of Siberia and the Far East. The article describes the significant events of scientific and pedagogical activity of Y. I. Sheikin, characterizes his main works and his contribution to ethnomusicology.

Electron Spin Resonance Study of Phenolic Antioxidants. Correlations of Organic Free Radical Stability with Antioxidant Activity

1972 ◽  
Vol 45 (2) ◽  
pp. 402-422 ◽  
Author(s):  
J. C. Westfahl ◽  
C. J. Carman ◽  
R. W. Layer
Keyword(s):  
Molecular Structure ◽  
Free Radicals ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Esr Spectroscopy ◽  
Spectroscopic Technique ◽  
Electron Spin Resonance Study ◽  
Phenolic Antioxidants ◽  
Radical Concentration ◽  
Spin Resonance

Abstract Electron spin resonance (ESR) is a well established, sensitive spectroscopic technique for determining the molecular structure, as well as the lifetime or stability of organic free radicals. Consequently, ESR spectroscopy provides a logical method for gaining insight into the role that free radicals play in the stabilization of rubber by organic antioxidants. We used ESR spectroscopy to determine the molecular structure of the phenoxyl free radicals derived from a series of twelve phenolic antioxidants. We also used ESR to measure relative radical concentrations of the free radicals and evaluated the twelve phenolic antioxidants relative to each other. We have found that the ESR measurement of relative radical concentration is a measure of relative radical stability, and that the relative radical stability is temperature dependent. By plotting relative radical concentration (or stability) as a function of temperature, we can rank these twelve antioxidants relative to each other. This ranking is in good agreement with the activity of these antioxidants in EPDM. These data were discussed in relation to antioxidant mechanism.

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