• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Magnetochemical Control of Photoreactions by Multiple Isotope Substitutions

Research Project

Project/Area Number 08640641
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical chemistry
Research InstitutionKANAZAWA UNIVERSITY

Principal Investigator

NAKAGAWA Ryoichi  Kanazawa University, Faculty of Pharmaceutical Sciences, Professor, 薬学部, 教授 (20159057)

Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,800,000 (Direct Cost: ¥1,800,000)
Keywordsexternal magnetic field effects / magnetic isotope effects / spin-lattice relaxation / biradical intermediates / hyperfine interaction / heavy carbon substitution / 磁場効果 / 磁気化学的反応制御
Research Abstract

We have investigated photochemical behavior of bichromophoric chain species containing hydrogen-donor and acceptor moieties. This type of chain molecules undergo intramolecular hydrogen abstraction reactions. Apparent magnetic field and magnetic isotope effects have been observed on photoredox reaction yields of a 4-nitro-1-naphthoxy derivative containing anilino moiety. This is one of few cases where the unimolecular cage reaction predominates in the zero-field and the bimolecular escape process becomes a major reaction pathway on application of external magnetic fields. On the other hand, conspicuous magnetic isotope effects (MIEs) have been detected on lifetimes of biradicals derived from bifunctional chain molecules consisting of aromatic carbonyl compounds and hydrogen-donor groups.
Some aspects of bifunctional photochemistry of nitroaryloxy and aromatic carbonyl species are summarized as follows : [1] magnetic field effects on photoredox product yields derived from the bichromophoric parent compounds containing nitro-aromatic moieties,
[2] magnetic field and magnetic isotope effects on decay profiles of biradical species,
[3] disappearance of heavy carbon magnetic isotope effects in a very high field region.
The third phenomenon is explained by taking account of the anisotropic magnetic interactions which contribute to the spin-lattice relaxation. The MIEs are observed when the anisotropic hyperfine interaction is of dominant importance. The MIEs disappear in the presence of very high fields (> 6T) where the anisotropic Zeeman interaction predominates.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 中垣 良一 他2名: "ラジカル反応における磁気同位体効果" 光化学. 22巻. 46-53 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 中垣 良一 他5名: "Magnetic Field and Magnetic Isotope Effects on Photochemistry of Chain-Linked Compounds Containing Benzophenone and Hydrogen-Donor Moleties" Journal of Physical Chemistry. 101. 556-560 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 中垣 良一 他7名: "High Magnetic Field and Isotope Effects on Lifetimes of Triplet Biradicals Consisting of Two Equivalent Benzophenone Ketyls Linked by Methylene Chains" Journal of Physical Chemistry. 101. 6842-6849 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] R.Nakagaki, Y.Fujiwara, and Y.Tanimoto: "Magnetic Isotope Effects on Photochemical Reactions" Koukagaku (Photochemistry). 22. 46-53 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] R.Nakagaki, M.Yamaoka, O.Takahira, K.Hiruta, Y.Fujiwara, and Y.Tanimoto: "Magnetic Field and Isotope Effects on Photochemistry of Chain-Linked Compounds Containing Benzophenone and Hydrogen-Donor Moieties" J.Phys.Chem.A. 101. 556-560 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Fujiwara, T.Aoki, T.Haino, Y.Fukazawa, Y.Tanimoto, R.Nakagaki, O.Takahira, and M.Okazaki: "High Magnetic Field and Magnetic Isotope Effects on Lifetimes of Triplet Biradicals Consisting of Two Equivalent Benzophenone Ketyls Linked by Methylene Chains" J.Phys.Chem.A. 101. 6842-6849 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 中垣 良一 他7名: "High Magnetic Field and Magmetic Isotope Effects on Lifetimes of Triplet Biradicals Consisting of Two Equivalent Benzophenone Ketyls Linked by Methylene Chains" Journal of Physical Chemistry,A. 101巻37号. 6842-6849 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 中垣良一他2名: "ラジカル反応における磁気同位体効果" 光化学. 22巻. 46-53 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] R.Nakagaki et al.: "Magnetic Field and Isotope Effects on Photochemistry of Chain-Linked Compounds Containing Benzophenone and Hydrogen-Donor Moieties" Journal of Physical Chemistry,A. 101. 556-560 (1997)

    • Related Report
      1996 Annual Research Report

URL: 

Published: 1996-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi