Regulation of Photochemical Reactions by Laser and Magnetic Field

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The aim of this project is to develop the novel technique for controlling photochemical reactions by laser and magnetic field.(1) Laser Intensity: The 266 nm laser excitation of &A, &A'-dichloro-o-xylene results in the formation of o-xylylene. From its laser power dependence, it is shown that o-xylylene is generated both one- and two-photon process. (2) Magnetic Field: From the analysis of the magnetic field effect upon the chainlinked singlet and triplet biradicals, its mechanism are precisely clarified. (3) Laser and Magnetic field: In the transient absorption spectra of a bichromophoric chain-linked bisdiazo molecule, magnetic field effect is observed only when the spectra are measured under the intense laser excitation. Upon the intense excitation, a chain-linked biscarbene and a biradical is generated via two-photon process. An external magnetic field affects triplet-singlet intersystem crossing of the biradical generated.In conclusion, the mechanisms of reaction control by laser and magnetic field are clarified.