Abstract

The photoreduction of xanthone with p-aminothiophenol in a sodium dodecylsulfate solution was investigated with the aid of a nanosecond laser flash photolysis technique at magnetic fields of 0–10 T. The lifetime of the radical pair generated by hydrogen abstraction of triplet xanthone and the yields of the escaped xanthone ketyl and p-aminophenylthiyl radicals increased steeply with increasing magnetic field strength (B) in a low-field region (B⩽0.05 T) and decreased more slightly with increasing B in a high-field region (0.05 T <B ⩽ 10 T). The observed magnetic field effects can be interpreted by a combination of the hyperfine coupling and the Δg mechanisms in the case of a triplet radical pair

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