Ferromagnetic behavior of a tetrafluorotetracyanoquinodimethanide salt at room temperature

✍ Scribed by Toyonari Sugimoto; Kazumasa Ueda; Masaya Tsujii; Hideo Fujita; Nobuyoshi Hosoito; Nobuko Kanehisa; Yoshiyuki Shibamoto; Yasushi Kai

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 354 KB
• Volume: 249
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)01418-7

✦ Synopsis

Recrystallization of N(CH3)f .TCNQF4-' in the presence of TCNQF 4 from acetonitrile/ether gave a crystal of {N(CH3) ~ • TCNQF 4-'}. ½(TCNQF4), which very interestingly exhibited ferromagnetism at room temperature. This organic ferromagnet has characteristics of very small saturation moment (1.03 × 10-3 ~B/molecule ) and coercive field (= 25 Oe). The origin of this ferromagnetism could be attributed to a unique crystal structure of the radical anion salt: the TCNQF4/TCNQF4-" and N(CH3) ~-ion layers are alternately stacked and in the TCNQF4/TCNQF 4 " layer each pair of two TCNQF4-" molecules is arranged in a completely perpendicular manner to each of one TCNQF 4 molecule.