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1994 Fiscal Year Final Research Report Summary

Magnetism of Organic Radical Complexes

Research Project

Project/Area Number 05453039
Research Category

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

Allocation TypeSingle-year Grants
Research Field Organic chemistry
Research InstitutionTohoku University

Principal Investigator

OSHIO Hiroki  Tohoku Universtiy, Faculty of Science, Associate Professor, 理学部, 助教授 (60176865)

Project Period (FY) 1993 – 1994
KeywordsMolecular Magnetism / Organic Radicals / Metal Complexes / Ferromagnetic Interaction
Research Abstract

Magnetic interaction within or between molecules are typically antiferromagnetic. If two magnetic orbials, each having one electron, are sufficiently close to interact, they can overlap to from antibonding and bonding orbitals. Both electrons locate on the bonding orbital with anti-parallel spin alignment. This situation can be regarded as a very weak chemical bond. However, ferromagnetic interactions can arise in several ways. For example, Orthogonal arrangement of the magnetic orbitals can lead to stabilization of the high-spin state, sucsituation being observed for metal complexes and metal-redical complexes. On the other hand, magnetic interactions between paramagnetic centers through diamagnetic metal ions are negligibly small or weakly antiferromagnetic.
Some diamagnetic metal ios are known to favor a tetrahedral coordination geometry which is suitable for the orthogonal arrangement of two bidentate ligands. Thus, it is anticipated that coordination of two bidentate radical ligands would lead to a ferromagnetic interaction between the radicals, In this work, we studied magneism of organic radical complexes whose central metal ions are diamagnetic. We have found that tetrahedral coordination geometries of copper (I) and silver (I) ions lead to the ferromagnetic interaction between coordinating radicals, especially the copper (I) ion propagate the fairly strong ferromagnetic intcraction (103 cm^<-1>).

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Hiroki Oshio: "″Cu(I) Iminonitroxide Complex:Ferromagnetic Interaction between Coordinating Iminonitroxides through Diamagnetic Cu(I) ion″" Angew.Chem.Inter.Ed.Engl.33. 670-671 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroki Oshio: "″Organo-Rhodium Complex with Tridentate Biradical Ligand,[Rh(Cp^*)(bisnitpy)](pF_6)_2" Chem.Lett.2353-2356 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroki Oshio: "″Incorporation of Mn^<III> and Fe^<II> Complexes into TCNQ Networks″" Bull.Chem.Soc.Jpn.68. 889-897 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroki Oshio: "″Control of Intramolecular Ferromagnetic Interaction by the Spin Polarization of dπ spin to pπ Orbital of an Organic Bridging Ligand″" J.Phys.Chem.(in press). (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroki Oshio: "″Structures and Magnetic Properties of [M(cyclam)(CH_3CN)_2]-[Ni(dmit)_2]_2 and [Cu(cyclam)]_2[2.5‐DM‐DCNQI]_5″" Inorg.Chem.32. 4123-4130 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Oshio: ""Structures and Magnetic Properties of [M (cyclam) (CH_3CN)_2] [Ni (dmit)_2] _2 (M=Cu and Ni) and [Cu (cyclam)] _2 [2,5-DM-DCNQI]_5"" Inorg. Chem.Vol. 32. 4123-4130 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Oshio, T.Watanabe, A.Ohto, and T.Ito: ""Cu (I) Imino Nitroxide Complex : Ferromagnetic Interaction between Coordinating Imino Nitroxides through a Diamagnetic Cu (I) Ion"" Angew. Chem. Inter. Ed. Engl.Vol. 33. 670-671 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Oshio, A.Ohto, J.Fukisawa, T.Watanabe, T.Ito and K.Isobe: ""Organo-Rhodium Complex with Tridentate Biradical Ligand, [Rh (Cp^*) (bisnitpy)] (PF_6) _2"" Chem. Lett.2353-2356 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Oshio, E.Ino, T.Ito, and Y.Maeda: ""Incorporation of Mn (III) and Fe (II) Complexes into TCNQ Networks : Preparation, Crystal Structures and Magnetic Properties of [Mn (III) (salen) (TCNQ)_< 0.5>] [Mn (III) (salen) (TCNQ)_<0.5> (CH_3OH)]CH_3OH.H_2O and [Fe (II) (CH_3OH)_4 (TCNQ) _2] TCNQ.2CH_3CN" Bull. Chem. Soc.Jpn. Vol. 68. 889-897 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Oshio, and H.Ichida: ""Control of Intramolecular Magnetic Interaction by the Spin Polarization of dpi Spin to ppi Orbital of an Organic Bridging Ligand"" J.Chem. Phys.(in press). (1995)

    • 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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