Association Reactions of the Anion Radicals of Some Hydroxyquinones: Evidence for Formation of π- and σ-Dimers As Well As a Neutral−Anion Radical Complex

2009 ◽  
Vol 114 (2) ◽  
pp. 1285-1292 ◽  
Author(s):  
Norma A. Macías-Ruvalcaba ◽  
Dennis H. Evans
Keyword(s):  
Anion Radical ◽  
Radical Complex ◽  
Anion Radicals

scholarly journals Reactions of Aromatic Anion Radicals and Dianions. VIII. Reversible Potentials and Spectra of Perylene Anion Radical Undergoing Rapid Chemical Follow-up Reactions.

1978 ◽  
Vol 32b ◽  
pp. 363-369 ◽  
Author(s):  
Elisabet Ahlberg ◽  
Bo Svensmark ◽  
David P. Parker ◽  
Vernon D. Parker ◽  
André Babadjamian ◽  
...  
Keyword(s):  
Anion Radical ◽  
Anion Radicals

Osazone Anion Radical Complex of Rhodium(III)

2011 ◽  
Vol 50 (4) ◽  
pp. 1331-1338 ◽  
Author(s):  
Sarat Chandra Patra ◽  
Manas Kumar Biswas ◽  
Amarendra Nath Maity ◽  
Prasanta Ghosh
Keyword(s):  
Anion Radical ◽  
Radical Complex

Properties of electrochemically generated primary anion radicals of 2,5-dimethyl-1-nitrophenylpyrroles

1981 ◽  
Vol 46 (10) ◽  
pp. 2494-2502 ◽  
Author(s):  
Pavel Kubáček
Keyword(s):  
Nitrogen Atom ◽  
Carbon Atom ◽  
Anion Radical ◽  
Platinum Electrode ◽  
Spin Population ◽  
Kinetics Of Decomposition ◽  
Primary Anion ◽  
Stable Anion ◽  
Kinetics Of ◽  
Anion Radicals

The first step of electrochemical reduction of 2,5-dimethyl-1-nitrophenylpyrroles on a platinum electrode in anhydrous acetonitrile consists in an one-electron process producing relatively stable anion radicals. The prediction based on HMO calculations concerning an almost complete localization of the LFMO in the nitrophenyl part of the studied molecules is fully confirmed by means of EPR spectroscopy. Magnitude of the found proton splitting constants is very close to the values found for anion radical of nitrobenzene. The splitting by nucleus of nitrogen atom of pyrrole cycle can be explained exclusively by the mechanism of π-σ spin polarization of σ C-N bond and by the spin population at the carbon atom. The EPR method has also been used for following the kinetics of decomposition of anion radicals of the molecules studied.

Koordinationschemie reduzierter N-Heterozyklen. Komplexe des Pyrazin-Radikalanions mit Phenylmetallkationen +MPh von Beryllium, Magnesium und Zink / Coordination Chemistry of Reduced N-Heterocycles. Complexes of Pyrazine Anion Radical with Phenyl Metal Cations +MPh of Beryllium, Magnesium and Zinc

1981 ◽  
Vol 36 (9) ◽  
pp. 1110-1116 ◽  
Author(s):  
Wolfgang Kaim
Keyword(s):  
Electron Transfer ◽  
Coordination Chemistry ◽  
Anion Radical ◽  
Esr Spectroscopy ◽  
Metal Cations ◽  
Coupling Constants ◽  
Isotopic Abundance ◽  
Natural Isotopic Abundance ◽  
Radical Complex

Abstract The diphenyls MPh2 (M = Be, Mg, Zn, Cd, Hg) have been reacted with pyrazine (Pz) in tetrahydrofuran. Only the magnesium derivative undergoes electron transfer to yield the 1:1 radical complex [Pz(MgPh)]·. However, in the presence of sodium or potassium persistent 1:2 complexes [Pz(MPh)2]+. are formed with M = Be, Mg, Zn. Use of the higher homologues CdPh2 and HgPh2 leads to reduction to the metals. The 1:2 complexes have been characterized by ESR spectroscopy; metal coupling constants of 9Be, 25Mg and 67Zn could be determined in natural isotopic abundance.

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