A CIDEP study of photolysis of duroquinone/hydrogen-donor homogeneous and triton micelle solutions

摘要

The CIDEP spectra of transient radicals during photolysis of the duroquinone (DQ)/ethylene glycol (EG) system in acid, basic, and micellar environments were measured with a home-made highly time-resolved ESR spectrometer. In the DQ/EG homogeneous solution, the enhanced emissive CIDEP signal of the neutral durosemiquinone radical DQH(center dot) was observed. When the DQ/EG solution at pH 9 or the DQ/EG/TX-100/H2O micelle system was photolyzed, the CIDEP signal of the duroquinone anion radical (DQ(center dot-)) was obtained. When the DQ/EG solution at pH 2.5 was irradiated, the CIDEP signal of DQH(center dot) appeared. These experimental results indicate that the neutral radical DQH(center dot) was formed by proton transfer from EG to (3)DQ*, and that DQ(center dot-) was formed by dissociation of DQH(center dot) accompanying polarization transfer.