Factors affecting the stability and equilibria of free radicals. Part 11. 1-Benzoyl-2,2-bis-(3,5-di-t-butylphenyl)hydrazyl and its temperature-dependent electron spin resonance spectrum

1983 ◽  
pp. 591-594 ◽  
Author(s):  
M. Teodor Căproiu ◽  
Mihai Elian ◽  
Nicoleta Grecu ◽  
Nicolae Negoită ◽  
Alexandru T. Balaban
Keyword(s):  
Free Radicals ◽  
Electron Spin Resonance ◽  
Electron Spin Resonance Spectrum ◽  
Electron Spin ◽  
Resonance Spectrum ◽  
Temperature Dependent ◽  
Factors Affecting ◽  
Spin Resonance ◽  
The Stability

E.S.R. Spectra of Free Radicals Relevant to Methacrylate Polymerization

1992 ◽  
Vol 45 (4) ◽  
pp. 659 ◽  
Author(s):  
HH Keah ◽  
ID Rae ◽  
DG Hawthorne
Keyword(s):  
Free Radicals ◽  
Electron Spin Resonance ◽  
Methyl Methacrylate ◽  
Electron Spin Resonance Spectrum ◽  
Electron Spin ◽  
Resonance Spectrum ◽  
Line Spectrum ◽  
Poly Methyl Methacrylate ◽  
Spin Resonance ◽  
Thermal Cleavage

Carbon-based free radicals were generated by thermal cleavage of the tetraester Me2C(COOME)-CH2-CMe( COOMe )- CMe ( COOMe )-CH2-C( COOMe )Me2 which is a model for head-to-head units in a poly(methyl methacrylate ) chain. The resulting electron spin resonance spectrum had higher resolution than the 'nine-line' spectrum previously reported; this enabled identification of the component radicals. In the present case, the spectrum was well matched by a summation of spectra of the Me2C(COOME)-CH2-CMe( COOMe ) radical and the 1-methoxycarbonyl-1-methylethyl radical Me2-C-COOMe derived from it by loss of methyl methacrylate. Both of these radicals were generated in separate experiments. Radicals were also generated from starting materials containing a CD3 group in place of the single CH3.

The electron spin resonance spectrum of the tyrosyl radical

1985 ◽  
Vol 107 (12) ◽  
pp. 3401-3406 ◽  
Author(s):  
Roger C. Sealy ◽  
Laura Harman ◽  
Paul R. West ◽  
Ronald P. Mason
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin Resonance Spectrum ◽  
Electron Spin ◽  
Resonance Spectrum ◽  
Tyrosyl Radical ◽  
Spin Resonance
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