Abstract
Magnetic field effects (MFEs) on a photoinduced electron-transfer reaction in a semi-rigid linked system (RuP–C60) were examined in toluene and o-dichlorobenzene. The transient absorption spectra indicated that the photogenerated biradical produced by an intramolecular electron-transfer reaction was observed only in o-dichlorobenzene. The decay rate constants (kd) for the biradical decreased steeply at lower magnetic fields (≤0.06 T) and rapidly recovered at 0.08 T. The kd value was observed to decrease gradually above 0.2 T. The MFEs strongly indicated the formation of the singlet-born biradical for RuP–C60. The dip in the MFE at 0.06 T was ascribed to the S–T level crossing mechanism. The MFEs above 0.2 T can be explained by a spin–spin relaxation mechanism due to the anisotropic Zeeman interaction being related to the exchange interaction.
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