ChemInform Abstract: RADICAL IONS IN PHOTOCHEMISTRY. 5. PHOTOSENSITIZED (ELECTRON TRANSFER) CYANATION OF OLEFINS

1978 ◽  
Vol 9 (18) ◽  
Author(s):  
A. J. MAROULIS ◽  
Y. SHIGEMITSU ◽  
D. R. ARNOLD
Keyword(s):  
Electron Transfer ◽  
Radical Ions

Electron-transfer fluorescence quenching of radical ions. Experimental work and theoretical calculations

1984 ◽  
Vol 106 (18) ◽  
pp. 5083-5087 ◽  
Author(s):  
Jens Eriksen ◽  
Karl Anker Joergensen ◽  
Jan Linderberg ◽  
Henning Lund
Keyword(s):  
Electron Transfer ◽  
Fluorescence Quenching ◽  
Experimental Work ◽  
Theoretical Calculations ◽  
Radical Ions

ChemInform Abstract: Radicals and Radical Ions as Intermediates of Electron Transfer Processes Through Peptides

ChemInform ◽  
2013 ◽  
Vol 44 (9) ◽  
pp. no-no
Author(s):  
Bernd Giese ◽  
Sonja Eckhardt ◽  
Miriam Lauz ◽  
Jian Gao ◽  
Min Wang
Keyword(s):  
Electron Transfer ◽  
Radical Ions ◽  
Transfer Processes ◽  
Electron Transfer Processes

Chemistry of radical ions: the absolute rate constant of dimerization of radical anions of 1 ,1-diphenyl ethylene

1965 ◽  
Vol 288 (1413) ◽  
pp. 212-223 ◽  
Keyword(s):  
Electron Transfer ◽  
Rate Constant ◽  
Transfer Process ◽  
Aromatic Hydrocarbons ◽  
Radical Anions ◽  
Electron Affinities ◽  
Absolute Rate ◽  
Radical Ions ◽  
Electron Transfer Process ◽  
Absolute Rate Constant

The combination of the labile radical ions, (Ph 2 C:CH 2 )7~, Na+, into dimeric dianions Na + , C - (Ph) 2 .CH 2 .CH 2 .C(Ph) - 2, Na+ was investigated by a flow and a stopflow technique. The bimolecular rate constant of combination was found to be 2 to 3 x 106 1. mole-1 s-1. The reaction was initiated by an electron transfer naphthalene^ + (P/*,2C:CH2) naphthalene+ (P/*,2C:CH^) or terphenylener + (P7fc2C:CH2) ⇔ terphenylene + (Pfe2C:CH^). The equilibrium constant of the first electron transfer process was found to be 20 and of the second about 16. These results are consistent with recent determinations of electron affinities of aromatic hydrocarbons.

Electron-Transfer Reactions between C60 and Radical Ions of Metalloporphyrins and Arenes

1994 ◽  
Vol 98 (17) ◽  
pp. 4617-4621 ◽  
Author(s):  
Dirk M. Guldi ◽  
Pedatsur Neta ◽  
Klaus-Dieter Asmus
Keyword(s):  
Electron Transfer ◽  
Transfer Reactions ◽  
Radical Ions ◽  
Electron Transfer Reactions

Radical ions in photochemistry. 18. The photosensitized (electron transfer) tautomerization of alkenes; the 1,1-diphenyl alkene system

1987 ◽  
Vol 65 (9) ◽  
pp. 2312-2314 ◽  
Author(s):  
Donald R. Arnold ◽  
Shelley A. Mines
Keyword(s):  
Hydrogen Bond ◽  
Electron Transfer ◽  
Radical Cation ◽  
Radical Anion ◽  
Relative Rate ◽  
Radical Cations ◽  
Radical Ions ◽  
Back Electron Transfer ◽  
Ambident Anion ◽  
Determining Factor

The photosensitized (electron transfer) irradiation of several conjugated 1,1-diphenyl alkenes, in acetonitrile with 1,4-dicyanobenzene or 1-cyanonapthalene as electron accepting sensitizer and 2,6-lutidine as base, leads essentially quantitatively to tautomerization to the less stable unconjugated isomer(s). The proposed mechanism for this reaction involves formation of the alkene radical cation and sensitizer radical anion followed by deprotonation of the radical cation, reduction of the resulting radical to the ambident anion by back electron transfer from the radical anion, and reprotonation. There are several steps in this mechanism that could control the ratio of isomers. Evidence is provided that, at least in some cases, it is the relative rate of deprotonation from the isomeric radical cations that is the determining factor. This rate is influenced by the conformation of the radical cation; the carbon–hydrogen bond involved in the deprotonation step must overlap with the singly occupied molecular orbital.

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