The hydrogen abstraction reaction of triplet benzophenone with thiophenol at room temperature was investigated in several nonviscous homogeneous solutions (η = 0.29−3.33 cP) by means of a nanosecond laser flash photolysis technique under magnetic fields of 0−10 T. The escape yield of the benzophenone ketyl radical decreased with increasing magnetic field strength from 0 to 10 T. In 2-methyl-1-propanol (η = 3.33 cP), the yield at 10 T reduced to 80 ± 2% of that at 0 T. The observed magnetic field effects can be interpreted by the Δ g mechanism when the geminate recombination process is faster than or comparable to the escape one.
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Wakasa et al. (1996) studied this question.
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