Proposed Mechanism of Ferromagnetic Interaction of Organic Ferromagnets: 4-(Arylmethyleneamino)-2,2,6,6-tetramethylpiperidin-1-oxyls and Related Compounds.

DOI PDF Web Site 被引用文献14件 参考文献57件
  • Nogami Takashi
    Department of Applied Physics and Chemistry, The University of Electro-Communications
  • Ishida Takayuki
    Department of Applied Physics and Chemistry, The University of Electro-Communications
  • Yasui Masanori
    Department of Applied Physics and Chemistry, The University of Electro-Communications
  • Iwasaki Fujiko
    Department of Applied Physics and Chemistry, The University of Electro-Communications
  • Takeda Naoya
    Institute for Solid State Physics, The University of Tokyo
  • Ishikawa Masayasu
    Institute for Solid State Physics, The University of Tokyo
  • Kawakami Takashi
    Department of Chemistry, Faculty of Science, Osaka University
  • Yamaguchi Kizashi
    Department of Chemistry, Faculty of Science, Osaka University

書誌事項

タイトル別名
  • Proposed Mechanism of Ferromagnetic Int

この論文をさがす

抄録

A possible mechanism of ferromagnetic coupling of a series of organic radical ferromagnets is presented, based on their crystal structures and molecular-orbital calculations. The investigated radicals are 4-(arylmethyleneamino)-2,2,6,6-tetramethylpiperidin-1-oxyls (abbreviated as Ar–CH=N–TEMPO, where Ar = phenyl, 4-methylthiophenyl, 4-chlorophenyl, 4-biphenylyl, and 4-phenoxyphenyl), and 4-hydroxyimino-TEMPO. All of these radical crystals have characteristic features that oxygen atoms of N–O radical sites of TEMPO moieties always locate near methyl- and/or methylene-hydrogens at β-positions of N–O in the TEMPO moieties of adjacent molecules. A positive spin on the N–O radical induces negative spins on the β-hydrogen atoms due to an intramolecular spin-polarization, ON(↑)–C(↓)–C(↑)–H(↓), which in turn induces a positive spin on the N–O sites of the adjacent molecules. This spin-alternation mechanism of ferromagnetic coupling among N–O sites via hydrogen bridges is also applicable to the case of an organic metamagnet, bis(2,2,6,6-tetramethylpiperidin-1-oxyl-4-yl) 1,6-hexanedicarboxylate. In the case of an organic ferromagnet, 2,4,6,8-tetramethyl-1,5-diazaadamantane-1,5-dioxyl, both the spin-alternation and direct exchange mechanisms seem to be operative.

収録刊行物

被引用文献 (14)*注記

もっと見る

参考文献 (57)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ