A chemically induced dynamic electron polarization study on the acetone ketyl radical and radical pair in an alcohol solution

1990 ◽  
Vol 92 (9) ◽  
pp. 5175-5185 ◽  
Author(s):  
Keisuke Tominaga ◽  
Seigo Yamauchi ◽  
Noboru Hirota
Keyword(s):  
Radical Pair ◽  
Alcohol Solution ◽  
Ketyl Radical ◽  
Electron Polarization ◽  
Polarization Study ◽  
Chemically Induced

Chemically induced dynamic nuclear and electron polarization. Part IX. The photolysis of tetrafluoro-p-benzoquinone in dioxane

1976 ◽  
Vol 54 (6) ◽  
pp. 979-983 ◽  
Author(s):  
Harish M. Vyas ◽  
Jeffrey K. S. Wan
Keyword(s):  
Radical Pair ◽  
Combination Product ◽  
Cross Combination ◽  
Excited Triplet ◽  
Primary Radical ◽  
Electron Polarization ◽  
Chemically Induced ◽  
Field Dependent ◽  
The Cross ◽  
Primary Radical Pair

The photoreduction of p-fluoranil in dioxane was studied by combined CIDNP and CIDEP techniques. It was established that the photoreactive species is the excited triplet of the quinone and the phototriplet mechanism is mainly responsible for the CIDEP observation. The CIDNP observations revealed the cage recombination of the primary radical-pair resulting in the formation of the cross-combination product from the semiquinone and the dioxane radicals. The cage recombination cannot be monitored by the conventional kinetic esr technique. The field dependent CIDNP intensity of the p-fluoranil in the photoreduction by fluorohydroquinone was also studied and a calculation based on Lawler's scheme showed that the results can be adequately explained by the radical-pair theory including both the scavenged and cage combination processes.

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