Trinuclear and mononuclear nickel(II)complexes incorporating tridentate 2-[(pyridine-2-ylimine)methyl]phenol ligand:Syntheses,crystal structures and magnetic properties

摘要

[Ni3(pymp)4(pya)2](NO3)2(CH3OH)2(1),[Ni3(pymp)4(pya)2]Cl2(CH3OH)2(2)and[Ni(pymp)2(py)2](3)(Hpymp=2-[(pyridine-2-ylimine)methyl]phenol,pya=pyridin-2-amine and py=pyridine)were synthesized and characterized.Crystal structures reveal that 1 and 2 contain phenoxo-bridged and N-C-N bridged linear trinuclear cores(uncommon for trinuclear nickel complexes),with the central Ni(II)being coordinated in a NiO4N2 fashion while the two terminal Ni(II)atoms adopt a NiO2N4 coordination mode.Two novel coordination modes of Hpymp ligand are presented in 1 and 2.Complex 3 displays a NiO2N4 coordination mode with the Ni(II)in a slightly distorted octahedral environment.Magnetic measurements of 1 indicated that the Ni centers are ferromagnetically coupled.