Comments on Paper by A. Manoogian: Interpretation of Ti3+ Electron Spin Resonance Spectra in Alums

1972 ◽  
Vol 50 (18) ◽  
pp. 2232-2234 ◽  
Author(s):  
Gerald F. Dionne
Keyword(s):  
Electron Spin Resonance ◽  
Experimental Evidence ◽  
Physical Model ◽  
Electron Spin ◽  
Nuclear Spin ◽  
Natural Abundance ◽  
Superhyperfine Structure ◽  
Spin Interactions ◽  
Spin Resonance ◽  
Nuclear Magnetic

The argument that Ti3+ ions produce 12 magnetic complexes when substituted for Al3+ in CsAl (SO4)2∙12H2O (Cs alum) is supported neither by experimental evidence nor a realistic physical model. The uniform intensity of the superhyperfine structure in Rb(TiAl) alum disproves the idea that titanium nuclei are involved because the natural abundance of nuclear magnetic isotopes is only 13%. In addition, the magnitudes of the splittings are too small to represent electron–nuclear spin interactions within the Ti3+ ions.

A comparison of electron spin resonance α- and β-hyperfine coupling constants in para-substituted α-phenethyl radicals

1986 ◽  
Vol 64 (4) ◽  
pp. 769-772 ◽  
Author(s):  
Donald R. Arnold ◽  
A. Martin de P. Nicholas ◽  
Kent M. Young
Keyword(s):  
Electron Spin Resonance ◽  
Experimental Evidence ◽  
Linear Relationship ◽  
Electron Spin ◽  
Hyperfine Coupling ◽  
Coupling Constants ◽  
Hyperfine Coupling Constants ◽  
Spin Resonance ◽  
Benzyl Radicals ◽  
Spin Delocalization

The linear relationship between the electron spin resonance hyperfine coupling constants (hfc) of the α- and β-hydrogens of para-substituted α-phenethyl radicals provides experimental evidence that the magnitude of both the α- and β -hfc is determined largely by the extent of spin delocalization in these benzylic systems. The [Formula: see text] scale, developed using substituted benzyl radicals, is shown to apply to phenethyl radicals as well.

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