REVERSION OF MAGNETIC-FIELD EFFECTS OBSERVED IN THE REACTION OF A TRIPLET-BORN RADICAL PAIR CONSISTING OF 2 EQUIVALENT SULFUR-CENTERED RADICALS

Magnetic field effects (MFEs) on the triplet sensitization of p-aminop henyl disulfide were investigated in a sodium dodecylsulfate (SDS) mic ellar solution by means of a nanosecond laser flash photolysis techniq ue at high magnetic fields up to 10 T. The yield of the escaped (P-ami nophenyl)thiyl radical increased steeply with increasing magnetic fiel d strength (B) from 0 to 1 T, but decreased gradually from 1 to 10 T. At 10 T, the yield of the escaped radical became similar to that at 0 T. The MFEs observed at both low (B less than or equal to 1 T) and hig h (1 T < B < 10 T) fields were simultaneously quenched by the addition of a paramagnetic Gd3+ ion, Thus, these reverted MFEs were interprete d by the relaxation mechanism through anisotropic hyperfine and Zeeman interactions.