Abstract
Energy transfer between S-phenyl 1-thionaphthoate (1-SPTN) and several triplet-state energy donors and acceptors were studied by transient absorption spectra. The results indicate that the energy transfer can occur efficiently either from energy donors to 1-SPTN or from 1-SPTN to energy acceptors. The energy transfer rate constant of xanthene to 1-SPTN is 1.4 × 10 10 s −1 mol −1 dm 3. This means that the energy transfer process is diffusion controlled. The triplet-state energy of 1-SPTN is about 252 kJ mol −1, estimated from the energy transfer processes and the phosphorescence emission. Photolysis of 1-SPTN results in two main products: diphenyldisulphide and 1,1′-binaphthyl. The photolysis proceeds via the triplet state mainly, as proved by external magnetic effect.
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