A laser flash photolysis study of the dynamic behaviour of radical pairs in micellar solutions under ultrahigh magnetic fields of up to 30 T |
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| Authors: | KIYOSHI NISHIZAWA YOSHIO SAKAGUCHI HARUO ABE GIYUU KIDO HISAHARU HAYASHI |
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| Institution: | 1. Molecular Photochemistry Laboratory , RIKEN (The Institute of Physical and Chemical Research) , Wako, Saitama, 351-0198, Japan;2. Tsukuba Magnet Laboratories , National Institute for Materials Science , Tsukuba, Ibaraki, 305-0003, Japan |
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| Abstract: | The photo-induced hydrogen abstraction reactions of benzophenone in aqueous micellar SDS and Brij 35 solutions, decafluorobenzophenone in an aqueous micellar Brij 35 solution and naphthoquinone in an aqueous micellar SDS solution were investigated at room temperature under pulsed magnetic fields of 0–29.6T. In each of these reactions, the radical pair decay rate is found to decrease with increasing field from 0 to about 3 T and to increase with increasing field above 3 T. The escape radical yield is found to increase with increasing field from 0 to about 3 T and to decrease with increasing field above 3 T. These magnetic field effects are explained in terms of the relaxation mechanism. In each of the Brij 35 micellar solution systems, the anisotropy in the g tensor of the ketyl radical and its correlation time are evaluated from the observed effects. |
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