Structural diversity in the assembly of helicate-type nickel(II) complexes with enantiopure bis((beta)-diketonate) ligands

The tartaric acid derived bis((beta)-diketonate) ligand L affords either 2:3 or 3:2 ligand:metal complexes with nickel(II) ions depending on the stoichiometry of the components; the two complexes posses different electronic and geometric properties.