Direct C-N Coupling in an in Situ Ligand Transformation and the Self-Assembly of a Tetrametallic [Ni-4(II)] Staircase

摘要

A [Ni-4(II)] staircase complex was serendipitously prepared from the reaction of the binucleating Schiff base proligand 2,6-bis[[(3-hydroxypropyl)imino]methyl]-4-methylphenol (H(3)L2) and 3,5-dimethylpyrazole (Me(2)pzH) with nickel(II) nitrate in a reaction at room temperature, initially aimed to yield a dinuclear complex. From a room temperature metal ion/ligand reaction, the proligand H3L2 in situ transformed to modified forms HL32- and HL42-, allowing the [Ni-4] formation. Variable-temperature magnetic behavior of a [Ni-4] complex reveals antiferromagnetic interactions with stabilization of a diamagnetic ground state (S-T = 0).