Electron spin resonance of .beta.-chloroalkyl nitroxides. Angular dependence of .beta.-chlorine hyperfine coupling

1970 ◽  
Vol 74 (15) ◽  
pp. 3025-3027 ◽  
Author(s):  
Edward G. Janzen ◽  
Bruce R. Knauer ◽  
Lewis T. Williams ◽  
William B. Harrison
Keyword(s):  
Electron Spin Resonance ◽  
Angular Dependence ◽  
Electron Spin ◽  
Hyperfine Coupling ◽  
Spin Resonance

Angular dependence of .beta.-fluorine electron spin resonance hyperfine coupling in fluoro-substituted nitroxide radicals

1970 ◽  
Vol 74 (9) ◽  
pp. 2037-2038 ◽  
Author(s):  
Edward G. Janzen ◽  
Bruce R. Knauer ◽  
John L. Gerlock ◽  
Kenneth J. Klabunde
Keyword(s):  
Electron Spin Resonance ◽  
Angular Dependence ◽  
Electron Spin ◽  
Hyperfine Coupling ◽  
Nitroxide Radicals ◽  
Spin Resonance

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.

Nitroxide derivatives of acetylacetone as spin-labelled ligands

1981 ◽  
Vol 59 (1) ◽  
pp. 156-163 ◽  
Author(s):  
D. Plancherel ◽  
D. R. Eaton
Keyword(s):  
Electron Spin Resonance ◽  
Metal Complex ◽  
Electron Spin ◽  
Hyperfine Coupling ◽  
Esr Spectra ◽  
Enol Form ◽  
Coupling Constants ◽  
Spin Resonance ◽  
Steric Factors ◽  
Derivatives Of

Electron spin resonance spectra are reported from a number of radicals derived from 2,4-pentadione substituted at the 3 position with nitroxide-containing groups. If the substituent is t-butyl nitroxide no metal complexes are formed. This is attributed to steric factors which prevent the formation of the enol form of the β-diketone. If the substituent is trifluoromethyl nitroxide two types of metal complex have been observed. The esr spectra of the first type are very similar to that of the uncomplexed radical. Such complexes are formed with Co(III) and Al(III). The esr spectra of the second type show considerably increased 14N and 19F hyperfine coupling constants and in some cases large couplings to the metal nucleus. Complexes for the second type have been observed with Pd(II), Pt(II), and Rh(III). The possible structures of these radicals are discussed.

E.P.R. studies of the anions of some peri-alkylnaphthalenes

1972 ◽  
Vol 25 (11) ◽  
pp. 2353 ◽  
Author(s):  
RFC Claridge ◽  
BM Peake
Keyword(s):  
Electron Spin Resonance ◽  
Molecular Orbital ◽  
Electron Spin ◽  
Hyperfine Coupling ◽  
Inductive Effect ◽  
Coupling Constants ◽  
Radical Anions ◽  
Hyperfine Coupling Constants ◽  
Spin Resonance ◽  
Aliphatic Substituent

The hyperfine coupling constants for the radical anions of 2,3-dihydro- phenalene (perinaphthane) and 7,8,9,l0-tetrahydrocyclohepta[de]naphthalene have been determined from analysis of the electron spin resonance spectra in solution. The results are compared with data from other mono- and di-peri- substituted naphthalenes. A simple H�ckel molecular orbital treatment is used to describe the inductive effect of the aliphatic substituent.

Electron spin resonance of irradiated crystals of 2-thiouracil; hyperfine coupling tensor for nuclei with

1980 ◽  
Vol 41 (2) ◽  
pp. 229-239 ◽  
Author(s):  
O Claesson ◽  
A Lund ◽  
J.-P Jørgensen ◽  
E Sagstuen
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Hyperfine Coupling ◽  
Coupling Tensor ◽  
Spin Resonance

Electron-spin resonance of stable radicals in Langmuir-Blodgett films of a merocyanine dye: Study of hyperfine coupling using aenriched15dye

1991 ◽  
Vol 43 (4) ◽  
pp. 2531-2540 ◽  
Author(s):  
Shin-ichi Kuroda ◽  
Keiichi Ikegami ◽  
Yuka Tabe ◽  
Kazuhiro Saito ◽  
Mitsuyoshi Saito ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Hyperfine Coupling ◽  
Langmuir Blodgett ◽  
Spin Resonance ◽  
Langmuir Blodgett Films ◽  
Stable Radicals
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