1992 Fiscal Year Final Research Report Summary
Regulation of Photochemical Reactions by Laser and Magnetic Field
| Project/Area Number |
03453011
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
物理化学一般
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
TANIMOTO Yoshifumi Hiroshima University, Faculty of Science, Associate Professor, 理学部, 助教授 (10110743)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIWARA Yoshihisa Hiroshima University, Faculty of Science, Research Associate, 理学部, 助手 (00209131)
FUJIWARA Masao Hiroshima University, Faculty of Science, Research Associate, 理学部, 助手 (00199390)
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| Project Period (FY) |
1991 – 1992
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| Keywords | Magnetic Field Effect / Laser Chemistry / Spin Chemistry / Photochemistry / Transient Absorption |
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| Research Abstract |
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.
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