Structure and magnetic property of the organic triradical with triazine skeleton; 2,4,6-tris{p-(N-oxy-N-tert-butylamino)phenyl}triazine

1,3,5-tris {p-(N-oxy-N-tert-butylamino)phenyl) benzene(2) is known as a per sistent triradical with a quartet ground state. A new triradical with a tri azine skeleton was synthesized and characterized. The nitroxide triradical with triazine derivative 2,4,6-tris(p-(N-oxy-N-tert-butylamino)phenyl}-1,3, 5-triazine (1) exhibited stronger intramolecular ferromagnetic interaction than that with benzene derivative 2, the magnitude of the interactions depe nding on the planarity of the structures and/or on the spin density of the center skeletons. The temperature dependence of the magnetic susceptibility values were observed for crystalline 1 in the range of 1.8-350 K. The simu lation of an isosceles-triangular exchange coupling model gave 15.3 +/- 0.8 K, gamma=0.77 +/- 0.1.