Synthesis and characterization of nickel(II) and copper(II) tricyanomethanide complexes with tris(2-aminoethyl)amine as co-ligand

Two new transition metal tricyanomethanide (tcm) complexes with tris(2-aminoethyl)amine (tren) as co-ligand, [Ni(tren)(tcm)2] (1) and [Cu(tren)]3·(μ3-tren)·NO3·5tcm·2H2O (2), were synthesized and characterized by FT-IR spectrum, Thermogravimetry (TG) and single crystal X-ray diffraction analysis. In 1 each nickel(II) atom is coordinated to two tcm anions and one tren molecule to form a mononuclear complex with distorted octahedral geometry. In 2 three copper(II) atoms, each being chelated by a tetradentate tren ligand, are bridged by a μ3-tren ligand to form a cationic trinuclear copper unit. Magnetic susceptibility measurement in the range 2–300 K indicates that there are weak ferromagnetic interactions in 1 (θ = 1.17 K, C = 1.17 cm3 mol−1 K, D = 3.5 cm−1, g = 2.17, zJ′ = 0.44 cm−1) and 2 (θ = 0.52 K, C = 1.35 cm3 mol−1 K) respectively.