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(Nitronyl Nitroxide)-Substituted Trioxytriphenylamine Radical Cation Tetrachlorogallate Salt: A 2p-Electron-Based Weak Ferromagnet Composed of a Triplet Diradical Cation

Authors

  • Dr. Masato Kuratsu,

    1. Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585 (Japan), Fax: (+81) 6-6605-2568
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  • Dr. Shuichi Suzuki,

    1. Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585 (Japan), Fax: (+81) 6-6605-2568
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  • Dr. Masatoshi Kozaki,

    1. Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585 (Japan), Fax: (+81) 6-6605-2568
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  • Dr. Daisuke Shiomi,

    1. Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585 (Japan), Fax: (+81) 6-6605-2568
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  • Prof. Kazunobu Sato,

    1. Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585 (Japan), Fax: (+81) 6-6605-2568
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  • Prof. Takeji Takui,

    1. Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585 (Japan), Fax: (+81) 6-6605-2568
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  • Dr. Tsuneki Kanzawa,

    1. Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531 (Japan)
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  • Prof. Yuko Hosokoshi,

    1. Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531 (Japan)
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  • Dr. Xiao-Zheng Lan,

    1. Research Center for Structural Themodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan), Fax: (+81) 6-6850-5526
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  • Dr. Yuji Miyazaki,

    Corresponding author
    1. Research Center for Structural Themodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan), Fax: (+81) 6-6850-5526
    • Yuji Miyazaki, Research Center for Structural Themodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan), Fax: (+81) 6-6850-5526

      Keiji Okada, Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585 (Japan), Fax: (+81) 6-6605-2568

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  • Prof. Akira Inaba,

    1. Research Center for Structural Themodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan), Fax: (+81) 6-6850-5526
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  • Prof. Keiji Okada

    Corresponding author
    1. Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585 (Japan), Fax: (+81) 6-6605-2568
    • Yuji Miyazaki, Research Center for Structural Themodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan), Fax: (+81) 6-6850-5526

      Keiji Okada, Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585 (Japan), Fax: (+81) 6-6605-2568

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Abstract

The synthesis and the solid state magnetic properties of (nitronyl nitroxide)-substituted trioxytriphenylamine radical cation tetrachlorogallate, , are reported. In the temperature region between 300 and 3 K, the magnetic behavior is characterized by the strong intramolecular ferromagnetic interaction (J/kB=+400 K) between the radical (NN) and the radical cation (TOT+) and the weak intermolecular antiferromagnetic interaction (J/kB=−1.9 K) between NNTOT+ ions. Below 3 K, a 3D-type long-range magnetic ordering into a weak ferromagnet was observed (TN=2.65 K). The magnetic entropy (Smag=8.97 J K−1 mol−1) obtained by the heat capacity measurement is in good agreement with the theoretical value of R ln3=9.13 J K−1 mol−1 based on the S=1 state.

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