Preparation and Characterization of Anion-Dependent Octahedral Nickel(II) Geometric Isomers

Metal complexes including Ni(II) ion with polynucleating ligands could display significant coordination chemistry, catalytic activity, and magnetic properties.2 Among these, stereoisomerism have been attracted in coordination chemistry for a long time, because it happens ligand interchange in solution and appears important properties, i.e., color and chirality.3 For example, [Co(en)2Cl2]Cl complex has different colors and structures, i.e., green for trans and violet for cis (en = ethylenediamine). Furthermore, cis- [Co(en)2Cl2]+ has two chiral isomers. We have reported the structures and magnetic properties of various metal complexes with N,N-bis(2-pyridylmethyl)-2-aminoethanol/- ate, in which they have had from mononuclear to tetranuclear structures depending on anions