Ferromagnetic and Antiferromagnetic Phases of 4-(4-Iodobenzylideneamino)-2,2,6,6-tetramethylpiperidin-1-yloxyl

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Temperature dependences of d.c. magnetic susceptibilities and magnetizations were measured for two different crystallographic phases of 4-(4-iodobenzylideneamino)-2,2,6,6-tetramethylpiperidin-1-yloxyl. Intermolecular ferromagnetic (Weiss temperature <i>θ</i> = +0.71 K) and antiferromagnetic (<i>θ</i> = −0.23 K) interactions were found for <i>α</i>- and <i>β</i>-phases, respectively, in the magnetic measurements above 1.8 K; the former phase showed a bulk ferromagnetic transition at 0.28 K. Based on the X-ray crystallographic data, intermolecular magnetic interactions are discussed. In the <i>α</i>-phase crystal, NO-radical sites form two-dimensional zigzag sheets. The ferromagnetic interaction within the sheet can be interpreted in terms of a <i>β</i>-<i>hydrogen mechanism</i>, ON(↑)–C<sub><i>α</i></sub>(↓)–C<sub><i>β</i></sub>(↑)–H<sub><i>β</i></sub>(↓)···(↑)ON<, in which the magnetic interaction is transmitted by <i>β</i>-hydrogens. A dimer structure was found in the <i>β</i>-phase crystal, and direct exchange and/or dipole interactions between N–O radicals seem to be the main origin of the antiferromagnetic interaction.

収録刊行物

  • Bulletin of the Chemical Society of Japan

    Bulletin of the Chemical Society of Japan 71(11), 2583-2587, 1998-11-15

    The Chemical Society of Japan

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    10008938376
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    ZP1(科学技術--化学・化学工業)
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