Synthesis, structure and magnetism of a μ3-carbonato bridged nickel(II) complex with 2,2′,2″-tris(2-aminoethyl)amine ligand: a new coordination mode of carbonato bridge

A novel image bridged Ni(II) complex with tris(2-aminoethyl)amine (tren), [Ni3(tren)3(H2O)2(μ3-CO3)](ClO4)4 · 2H2O, was obtained by bubbling CO2 into an aqueous solution of μ2-OH bridged Ni(II) complex. The X-ray structure analysis of the title complex shows that the three nickel atoms are asymmetrically bridged by one tetradentate carbonato ligand, which presents a new bridge mode. The further magnetochemistry study exhibits a strong antiferromagnetic coupling between nickel(II) ions with J1 = −11.03 cm−1, J2 = −80.27 cm−1 in the title compound.