Ferromagnetism in a dinuclear nickel(II) complex containing triethylenetetramine and tricyanomethanide

Boca R; Gembicky M; Herchel R; Haase W; Jager L; Wagner C; Ehrenberg H; Fuess H

Inorganic Chemistry, Vol.42, No.22, 6965-6967, 2003

Boca R, Gembicky M, Herchel R, Haase W, Jager L, Wagner C, Ehrenberg H, Fuess H

Triethylenetetramine (L-4) was used as a tetradentate blocking ligand that, after complexation with Ni-II, leaves two sites ready for ligation with tricyanomethanide. The formed binuclear complex [(LNi)-Ni-4(NCC(CN)CN)(2)NiL4] (ClO4)(2) exhibits a ferromagnetic coupling with J/hc = +0.15 cm(-1) and g(Ni) = 2.126; below 16 K, a ferromagnetic ordering is evidenced by ac magnetic susceptibility (both in-phase and out-of-phase), magnetization, field-cooled magnetization, and zero-field-cooled magnetization measurements.