Chemically induced dynamic electron polarization. Part 8.—Simultaneous operations of the radical-pair and photoexcited triplet mechanisms in the photolysis of substituted benzoquinone, naphthoquinone and anthraquinone

1976 ◽  
Vol 72 (0) ◽  
pp. 1799 ◽  
Author(s):  
B. B. Adeleke ◽  
J. K. S. Wan
Keyword(s):  
Radical Pair ◽  
Electron Polarization ◽  
Chemically Induced ◽  
Simultaneous Operations

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.

Chemically induced dynamic electron polarization of the diethoxyphosphonyl radical: a case of mixed S-T0 and S-T- radical pair polarization

1985 ◽  
Vol 89 (20) ◽  
pp. 4286-4291 ◽  
Author(s):  
T. J. Burkey ◽  
J. Lusztyk ◽  
K. U. Ingold ◽  
J. K. S. Wan ◽  
F. J. Adrian
Keyword(s):  
Radical Pair ◽  
Electron Polarization ◽  
Chemically Induced
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