homogeneous solvents and micellar solutions

A comparative study of CIDEP spectra was made, using a highly time-resolved ESR spectrometer, of photolyzed p-benzosemiquinone radicals in homogeneous solvents and TX-100 (Triton X-100) micellar solutions. The spectrum obtained from an EG (ethylene glycol) H20 homogeneous solution of p-benzoquinone (PBQ) contains ix major peaks of PBQH. and three minor peaks of PBQ "-. In TX-100 EG-H20 micellar solutions of PBQ, the intensities of PBQ.- peaks increase and become stronger than those of PBQH'. In acid solution, more H2SO4 is added to the micellar system than to the homogeneous system to obtain a similar spectrum with an alternating linewidth caused by the proton exchange of PBQH.. Based on the mechanism that polarization of PBQ.- is transferred from PBQH. through its dissociation reaction, special properties of the bound water in the polyethylene glycol shell of TX-100 micelles where photolyzed p-benzosemiquinone radicals are generated are discussed to explain these results. © 199