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

• Takayuki Ishida

• Kensuke Togashi

• Ron Imachi

Bibliographic Information

Other Title

• Ferromagnetic and Antiferromagnetic Pha

Abstract

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 θ = +0.71 K) and antiferromagnetic (θ = −0.23 K) interactions were found for α- and β-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 α-phase crystal, NO-radical sites form two-dimensional zigzag sheets. The ferromagnetic interaction within the sheet can be interpreted in terms of a β-hydrogen mechanism, ON(↑)–Cα(↓)–Cβ(↑)–Hβ(↓)···(↑)ON<, in which the magnetic interaction is transmitted by β-hydrogens. A dimer structure was found in the β-phase crystal, and direct exchange and/or dipole interactions between N–O radicals seem to be the main origin of the antiferromagnetic interaction.

Journal

• Bulletin of the Chemical Society of Japan

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

  Tokyo : Chemical Society of Japan

Keywords

• General Chemistry

Details

• CRID: 1522543654804120960
• NII Article ID: 10008938376
• NII Book ID: AA00580132
• ISSN: 00092673
• ISSN: 13480634
• DOI: 10.1246/bcsj.71.2583
• NDL BIB ID: 4603247
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4603247
• Web Site: https://academic.oup.com/bcsj/article-pdf/71/11/2583/56192527/bcsj.71.2583.pdf
• Text Lang: en
• NDL Source Classification:
  • ZP1(科学技術--化学・化学工業)
• Data Source:
  • NDL
  • Crossref
  • CiNii Articles