Yoshio TEKI (IMS and Osaka City Univ.), Koichi ITOH (Osaka City Univ.), Atsuhiko OKADA (Osaka Univ.), Hirokazu YAMAKAGE (Osaka Univ.), Tatsuo KOBAYASHI (Osaka Univ.), Kiichi AMAYA (Osaka Univ.), Sinya KUROKAWA (Osaka City Univ.), Sadaharu UENO (Osaka City Univ.) and Yozo MIURA (Osaka City Univ.)
[Chem. Phys. Lett. 270, 573 (1997)]
The magnetic properties of N-[(dichlorophenyl)thio]-2,4,6-triarylphenyl-aminyl radical crystals are reported. The tree stable thioaminyls show ferromagnetic behaviors described using the on-dimentional Heisenberg model with the large ferromagnetic interaction of 2J/kB = 28.0, 11.4 and 3.6 K. The other two radicals show the antiferromagnetic alternating chain behaviors with 2J/kB = -16.8 K, (alpha) = 0.55 and 2J/kB = -128.8 K, a = 0.90. The low-temperature susceptibility and heat capacity measure-ments of the crystal showing 2J/kB = 28.0 reveals a magnetic phase transition at 0.4 K. The ordered phase shows spin-flop transition which reveals an antiferromagnetic long range order.