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1993 Fiscal Year Final Research Report Summary

Development of the CIDNP-detected Electron Spin Resonance Apparatus for the Aid of Investigation of Radical Pairs

Research Project

Project/Area Number 03554013
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 物理化学一般
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

AZUMI Tohru  Facul.of Science, Tohoku Univ.Professor, 理学部, 教授 (90013490)

Co-Investigator(Kenkyū-buntansha) FUJII Kanae  JEOL.Co., Ltd, Head Investigator, 分析機器技術本部, 課長
MAEDA Kiminori  Facul.of Science, Tohoku Univ.Assistant, 理学部, 助手 (70229300)
Project Period (FY) 1991 – 1993
KeywordsCIDNP / ESR / CIDNP-detected ESR / SNP / DNP / dichlorobenzoquinone / Radical Pair
Research Abstract

In most of chemical reactions in solution, the whole fate of the reaction path is governed by the small interaction that is operative within a short lifetime of radical pairs. In this respect one whishes to observe the spectrum of radical pairs and analyze it to fully understand chemical reactions. However, in any conventional spectroscopy, the spectrum due to radical pairs and that due to free radicals cannot be separately observed.
The CIDNP-detected ESR spectroscopy has been developed in order to separately obseve the ESR spectrum of radical pairs and that of free radicals. We have further tried to extend this spectroscopy to time-resolved spectroscopy.
By this new spectroscopy, a lot of chemical reactions have been investigated. As an example, the photo-induced hydrogen abstraction reaction of dichlorobenzoquinone has been investigated. It has found that the hydroxybenzoquinone radical that exists as a radical pair and that exists as a free radical are different. This amazing conclusion can never be obtained by any other spectroscopic means. Further, the lifetime of radical pairs was determined as 20 ns.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Q.Meng,et al.: "Triplet Mechanism of CIDNP in the Photolysis of Bensozuinones As Studied by Dynamic Nuclear Polarization." J.Phys.Chem.97. 1265-1269 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Yamakage,et al.: "Dynamic Nuclear Polarization Studies of Anomalous CIDNP Behavior of Benzaldehyde." Chem.Phys.Lett.204. 411-414 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Maeda,et al.: "Phosphorescence from the Delocalized Triplet State of Polysilylenes." J.Phys.Chem.97. 12144-12146 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Miki,et al.: "Effect of the Ligand-Field Strength on the Radiative Properties of the Ligand-Localized ^3ππ^* State of…" J.Phys.Chem.97. 11175-11179 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Maeda,et al.: "Time Resolved DNP Study on the Hydrogen Abstraction Reaction of Benzaldehyde." Applied Magnetic Resonance. 5. 177-185 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Q.Meng,et al.: "DNP Spectrum Observed in the Photolysis of Benzoquinone and Some of Its Methyl Derivatives.The Triplet…" Z.Phys.Chem.180. 95-110 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Q.Meng, et al.: "Triplet Mechanism of CIDNP in the Photolysis of Benzoquinones As Studied by Dynamic Nuclear Polarization." J.Phys.Chem.97. 1265-1269 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Yamakage, et al.: "Dynamic Nuclear Polarization Studies of Anomalous CIDNP Behavior of Benzaldehyde." Chem.Phys.Lett.204. 411-414 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Maeda, et al.: "Phosphorescence from the Delocalized Triplet State of Polysilylenes." J.Phys.Chem.97. 12144-12146 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Miki, et al.: "Effect of the Ligand-Field Strength on the Radiative Properties of the Ligand-Localized ^3pipi^<**> State of Rhodium Complexes with..." J.Phys.Chem.97. 11175-11179 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Maeda, et al.: "Time Resolved DNP Study on the Hydrogen Abstraction Reaction of Benzaldehyde." Appl.Mag.Reson.5. 177-185 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Q.Meng, et al.: "DNP Spectrum Observed in the Photolysis of Benzoquinone and Some of Its Methyl Derivatives. The Triplet Mechanism in CIDNP." Z.Phys.Chem.180. 95-110 (1993)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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