Equilibrium studies by electron spin resonance. VIII. Use of time averaged coupling constants to determine free ion-ion pair equilibrium constants

1974 ◽  
Vol 78 (17) ◽  
pp. 1771-1773 ◽  
Author(s):  
Gerald R. Stevenson ◽  
Antonio E. Alegria
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Equilibrium Constants ◽  
Ion Pair ◽  
Coupling Constants ◽  
Equilibrium Studies ◽  
Use Of Time ◽  
Spin Resonance ◽  
Free Ion

Equilibrium studies by electron spin resonance. II. Nitrobenze free ion-ion pair equilibrium

1972 ◽  
Vol 76 (14) ◽  
pp. 2058-2060 ◽  
Author(s):  
Gerald R. Stevenson ◽  
Luis Echegoyen ◽  
Luis R. Lizardi
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Ion Pair ◽  
Equilibrium Studies ◽  
Spin Resonance ◽  
Free Ion

A PARAMAGNETIC RESONANCE STUDY OF HINDERED DIARYLMETHYL RADICALS AND RELATED COMPOUNDS: I. ANALYSIS OF THE SPECTRA

1966 ◽  
Vol 44 (12) ◽  
pp. 1387-1395 ◽  
Author(s):  
H. R. Falle ◽  
F. C. Adam
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Ion Pair ◽  
Coupling Constants ◽  
Methyl Groups ◽  
Steric Repulsion ◽  
Paramagnetic Resonance ◽  
Spin Resonance ◽  
Phenyl Rings ◽  
Related Compounds

Several ortho-substituted radicals of the benzhydryl type and a variety of diaryl ketyls have been studied through the nuclear hyperfine structure of their electron spin resonance spectra. A strong similarity is found between the spectra of a given ketyl and its hydrocarbon analogue. This suggests that when ketones are reduced, a very tight ion pair is formed between the ketyl anion and its cation. Although the coupling constants of the protons vary with different reducing agents, larger variations are observed when bulky groups are substituted into ortho positions. These larger changes are attributed to a forced internal rotation of the phenyl rings. The distortion results from the steric repulsion between the ortho groups. The effect of 'buttressing' of ortho methyl groups is also studied. Deuterium and 13C substitutions have been effected in some of the compounds.

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