Syntheses, crystal structures and magnetic properties of three new binuclear Ni(II) complexes derived from tripodal tetradentate (N4) ligands

Three new binuclear Ni(II) complexes [{Ni(L22py)Cl}2](ClO4)2 (1), [{Ni(L23py)Cl}2](ClO4)2 (2), and [{Ni(L33py)Cl}2](ClO4)2 (3), {L22py = N-(2-pyridylmethyl)-N-(2-aminoethyl)-1,2-diaminoethane, L23py = N-(2-pyridylmethyl)-N-(2-aminoethyl)-1,3-diaminopropane, L33py = N-(2-pyridylmethyl)-N-(3-aminopropyl)-1,3-diaminopropane} have been synthesized. Single crystal X-ray structure analysis showed that in each complex two distorted octahedral Ni(II) ions are bridged asymmetrically by a pair of chloride anions. Variable temperature magnetic susceptibility measurements of 1 and 3 revealed dominant ferromagnetic exchange interactions.

Graphical abstractThree binuclear Ni(II) complexes have been prepared by the reaction of three previously known tetraamine ligands, bearing pyridyl group, with nickel(II) perchlorate in equimolar ratios. The resulting compounds were characterized by elemental analysis, IR and single crystal X-ray diffraction. The magnetic properties in two cases were investigated.Figure optionsDownload full-size imageDownload as PowerPoint slide