The radical anions of [2.2]metaparacyclophane and some derivatives. A comprehensive ESR, ENDOR, and TRIPLE resonance study of unstable paramagnetic species in solution

1988 ◽  
Vol 110 (19) ◽  
pp. 6377-6384 ◽  
Author(s):  
Juerg. Bruhin ◽  
Fabian. Gerson ◽  
Wiliam B. Martin ◽  
Hynek. Novotny
Keyword(s):  
Paramagnetic Species ◽  
Radical Anions ◽  
Triple Resonance

Photolytic and thermal annealing of radical anions gamma-irradiated monocarboxylic acids

1979 ◽  
Vol 44 (12) ◽  
pp. 3632-3643 ◽  
Author(s):  
Karel Mach ◽  
Igor Janovský ◽  
Karel Vacek
Keyword(s):  
Thermal Annealing ◽  
Pivalic Acid ◽  
Esr Spectra ◽  
Paramagnetic Species ◽  
Radical Anions ◽  
Γ Irradiation ◽  
Before And After ◽  
Optical Bleaching ◽  
The Difference ◽  
Gamma Irradiated

Total yields of paramagnetic species, their optical bleaching and thermal annealing in acetic, propionic, a-butyric, isobutyric, and pivalic acid γ-irradiated at 77 K were followed by ESR spectroscopy. Radical anions, always found after irradiation, disappear during optical bleaching without formation of any paramagnetic product. During thermal annealing they are converted almost quantitatively into the α-radicals of the respective acid, with the exception of pivalic acid. Amounts of radical anions were estimated from the difference of integrated ESR spectra taken before and after optical bleaching. The results show that approximately equal amounts of the reduction and oxidation paramagnetic products of the γ-irradiation can be detected.

ChemInform Abstract: Radical Anions of Cyclic Azoalkanes: An ESR, ENDOR, and TRIPLE- Resonance Study

ChemInform ◽  
2010 ◽  
Vol 23 (10) ◽  
pp. no-no
Author(s):  
C. H. ESS ◽  
F. GERSON ◽  
W. ADAM
Keyword(s):  
Radical Anions ◽  
Triple Resonance

Die Reduktion von Triphenylphosphan-Derivaten zu ihren Radikalanionen und zum Dibenzophosphol-Radikaldianion [1] / The Reduction of Triphenylphosphane Derivatives to their Radical Anions and to the Radical Dianion of Dibenzophosphole [1]

1982 ◽  
Vol 37 (11) ◽  
pp. 1382-1387 ◽  
Author(s):  
Wolfgang Kaim ◽  
Peter Hänel ◽  
Hans Bock
Keyword(s):  
Low Temperature ◽  
Alkali Metal ◽  
Ring Closure ◽  
Metal Reduction ◽  
Paramagnetic Species ◽  
Radical Anions ◽  
Spin Distribution ◽  
Pyramidal Geometry ◽  
Mercury Cathode ◽  
Electron Reduction

Triphenylphosphane 1, its oxide 2 and sulfide 3 undergo one-electron reduction at a mercury cathode in DMF to yield the corresponding radical anions. ESE analysis of the paramagnetic species is facilitated by deuteration and suggests a pyramidal geometry of the radicals. Reduction with potassium metal in DME at low temperature yields also radical anions for 2 and 3. The phosphane 1, however, reacts under phenyl cleavage and potassiumphenyl-assisted ring closure to the dianion of 5H-dibenzophosphole 4. This radical 4· ⊖⊖ is also obtainod by alkali metal reduction of P-phenyldibenzophosphole o, and its spin distribution is compared to iso-.-π-electronic radicals containing CH, N, O, S, or Se links instead of the phosphorus atom.

ChemInform Abstract: Radical Anions of Cyclic Azoalkanes: An ESR, ENDOR, and TRIPLE- Resonance Study.

ChemInform ◽  
2010 ◽  
Vol 23 (18) ◽  
pp. no-no
Author(s):  
C. H. ESS ◽  
F. GERSON ◽  
W. ADAM
Keyword(s):  
Radical Anions ◽  
Triple Resonance

Radical Anions of Cyclic Azoalkanes: An ESR, ENDOR, and TRIPLE-Resonance Study

1991 ◽  
Vol 74 (8) ◽  
pp. 2078-2093 ◽  
Author(s):  
Caspar H. Ess ◽  
Fabian Gerson ◽  
Waldemar Adam
Keyword(s):  
Radical Anions ◽  
Triple Resonance
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