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1993 Fiscal Year Final Research Report Summary

Highly Sensitive TM-mode ENDOR and its Biological Applications

Research Project

Project/Area Number 04640443
Research Category

Grant-in-Aid for General Scientific Research (C)

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

Principal Investigator

YAMAUCHI Jun  Kyoto University, Graduate School of Human & Environmental Studies, Prof., 大学院・人間・環境学研究科, 教授 (10027071)

Co-Investigator(Kenkyū-buntansha) SUGIMOTO Toyonari  Kyoto University, Graduate School of Engineering, Associate Prof., 大学院・工学研究科, 助教授 (30093256)
Project Period (FY) 1992 – 1993
KeywordsENDOR / TM-mode cavity / flat ESR cell / sterical hindrance / NO scavenger / Wurster's blue cation radical / nitroxide radical / benzophenone anion radical
Research Abstract

In order to accomplish a high sensitive ENDOR spectrometer and its development into biological systems, we examined electronis circuits and a cavity therein. In particular, a TM mode-type ENDOR cavity was precisely checked and newly produced by repeating actual observations using several of the typical organic radicals. We finally obtained high loaded Q-value amounting to more than 3000, which essentially contributes ro the high sensitivity and low signal-to-noise ratio.
Systems investigated were sterically hindeered 2-methylbenzophenone anion radical, nitric oxide (NO) scavebger 4,4,5,5-tetramethyl imidazoline-1,3-oxyl, Wurster's blue cation radical and so forth. In the sterically hindered system, there are lot of non-equivalent protons resulting in broad ESR lines. In our case we could resolve 8-9 lines which allowed perfect ESR analysis, and a hindered rotation mechanism was discussed in detail. ^1H- and ^<14>N-ENDOR spectra of NO-trapping scavenger revealed an important role of NO in the biological systems. In addition, it was established that a flat cell combined with the TM-mode cavity is powerful to study the biological important radicals, which sometimes cause low Q-value and therefore low sensitivity in ENDOR.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 藤田英夫 他: "4.4.5.5-テトラメチルイミダゾリン-1-オキシルの^1H-および^<14>N-ENDORスペクトルと電子状態" 磁気共鳴と医学. 4. 3-6 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山内淳 他: "Antiferrowagnetic Long-Rauge Ordering of Organic Free Radicals" Mol.Cryst.Liq.Crysy.233. 97-104 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山内 淳 他: "Maguetic Interactions of Organic Free Radicals under High Pressure" New Functionality Materials. C. 555-560 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 杉本豊成 他: "Intramoleaular Spin-Spin Exchavge in Cation Radicals of Tetrathiafulvolene" Chew.Letl. 1361-1364 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山内 淳 他: "ESR and ENDOR studies of the 2-Methylbenyophenne Avion Radical" Bull.Chem.Soc.Jpn.66. 2505-2509 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 杉本豊成 他: "Spin-Spin Coupling Between the two Unprired Electrons in Pications" Advanced Materials. 5. 741-743 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Yamauchi et al.: "^1H- and ^<14>N-ENDOR spectra of 4,4,5,5-tetramethylimidazoline-1,3-oxyl and its electronic states" Magnetic resonance and Medical science. 4. 3-6 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Yamauchi et al.: "Antiferromagnetic Long Range ordering of Organic Free Radicals" Mol.Cryst.Liq.Cryst.233. 97-104 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Yamauchi et al.: "Magnetic Interactions of Organic Free Radicals under High Pressure" New Functionality Materials. C. 555-560 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sugimoto et al.: "Intramolecular Spin-Spin Exchange in Cation Radicals of Tetrathiafulvalene" Chem.Lett.1361-1364 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Yamauchi et al.: "ESR and ENDOR studies of the 2-methyl benzophenone anion radical" Bull.Chem.Soc.Jpn.66. 2505-2509 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Sugimoto et al.: "Spin-Spin Coupling between the Two Unpaired Electrons in Dications" Advanced Materials. 5. 741-743 (1993)

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

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Published: 1996-04-15  

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