Radical-anion intermediates. Part V. Electron spin resonance spectra of radical anions and dianion radicals of some 9-substituted fluorenes

1972 ◽  
pp. 2010 ◽  
Author(s):  
B. J. Tabner ◽  
T. Walker
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Radical Anion ◽  
Radical Anions ◽  
Spin Resonance

The use of electron spin resonance to measure reaction rates

1968 ◽  
Vol 302 (1470) ◽  
pp. 331-334 ◽  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Radical Anion ◽  
Electron Spin Resonance Signal ◽  
Reaction Rates ◽  
Radical Anions ◽  
Resonance Signal ◽  
Spin Resonance ◽  
Unsaturated Molecule ◽  
Made In

At Cardiff, we have used electron spin resonance measurements to study the reactions of radical anions formed by the addition of electrons to unsaturated molecules. In certain cases the unsaturated molecule is such that the radical anion formed by the addition of the electron undergoes no reaction except that of disproportionation. For example, when the radical anion of tetraphenylethylene is made in tetrahydrofuran as solvent, disproportionation occurs: 2( Ph 2 C = C Ph 2 )· - Na + ⇌ Ph 2 C̅—C̅ Ph 2 + Ph 2 C = C Ph 2 . Na + Na + The presence of the four phenyl groups prevents the radical anion from dimerizing and electron transfer from one radical anion to another is the only possible reaction (Bennett, Evans, Evans, Owen & Tabner 1963; Evans & Evans 1963; Evans & Tabner 1963). In other cases, the radical anion formed by electron addition undergoes reaction and this reaction can be studied by the change with time of the electron spin resonance signal.

Electron spin resonance detection of heterogeneous reactions of Pigment Red 122

1990 ◽  
Vol 68 (4) ◽  
pp. 640-643
Author(s):  
Mary Jane Walzak ◽  
John R. Harbour
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Radical Anion ◽  
Heterogeneous Reactions ◽  
Resonance Spectroscopy ◽  
G Factor ◽  
Spin Resonance ◽  
Two Component ◽  
Induced Signal ◽  
Resonance Detection

Electron spin resonance spectroscopy (ESR) has been used to investigate the electrochemical and photolytic behaviour of particulate C.I. Pigment Red 122. Heterogeneous electrochemical reduction and oxidation of the pigment resulted in different reversible ESR signals with the radical cation giving a signal of ΔHpp = 2.3 G and g-factor of 2.0033 and the radical anion giving ΔHpp = 3.2 G and g-factor 2.0039. On exposure to light the inherent ESR signal, which was determined to be a two-component signal, increased in intensity by a factor of 2.4 but did not change in linewidth or g-factor. This light-induced signal was reversible and decayed to initial levels in the dark. The mechanism of these reactions is discussed. Keywords: ESR, pigment, electrochemistry, photo effects.

Ring strain effects. IV. Electron spin resonance study of the radical anions of a series of strained naphthalene hydrocarbons

1974 ◽  
Vol 39 (15) ◽  
pp. 2276-2281 ◽  
Author(s):  
Reuben D. Rieke ◽  
Stephen E. Bales ◽  
Claude F. Meares ◽  
Loretta I. Rieke ◽  
Charles M. Milliren
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Electron Spin Resonance Study ◽  
Radical Anions ◽  
Strain Effects ◽  
Ring Strain ◽  
Spin Resonance ◽  
Spin Resonance Study
Sign in / Sign up

Export Citation Format

Share Document