Two new [Ni(tren)2]2+ complexes:: [Ni(tren)2]Cl2 and [Ni(tren)2]WS4

Both title compounds, bis[tris(2-aminoethyl)amine]nickel(II) dichloride, [Ni(tren)(2)]Cl-2, (I), and bis[tris(2-aminoethyl)-amine]nickel(II) tetrathiotungstate, [Ni(tren)(2)]WS4, (II), contain the [Ni(tren)(2)](2+) cation [tren is tris(2-aminoethyl)-amine, C6H18N4]. The tren molecule acts as a tridentate ligand around the central Ni atom, with the remaining primary amine group not bound to the central atom. In (I), Ni2+ is located on a centre of inversion surrounded by one crystallographically independent tren molecule. In the [Ni(tren)(2)](2+) cation of (II), the Ni atom is bound to two crystallographically independent tren molecules. The Ni atoms in the [Ni(tren)(2)](2+) complexes are in a distorted octahedral environment consisting of six N atoms from the chelating tren molecules. The counter-ions are chloride anions in (I) and the tetrahedral [WS4](2-) anion in (II). Hydrogen bonding is observed in both compounds.