Ferromagnetism in a Dinuclear Nickel(II) Complex Containing Triethylenetetramine and Tricyanomethanide

Triethylenetetramine (L4) was used as a tetradentate blocking ligand that, after complexation with NiII, leaves two sites ready for ligation with tricyanomethanide. The formed binuclear complex [L4Ni(NCC(CN)CN)2NiL4](ClO4)2 exhibits a ferromagnetic coupling with J/hc = +0.15 cm-1 and gNi = 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.