Synthesis and structure of optically active compounds [Ni(HL1)]NO3 and [Ni(HL2)]NO3⋅H2O containing anions of diaminodioximes H2L1 and H2L2 derived from α-pinene and (+)-3-carene as ligands

New optically active levorotatory compounds [Ni(HL1)]NO3 (I) and [Ni(HL2)]NO3⋅H2O (II) containing the anions of chiral diaminodioximes, H2L1 and H2L2, derived from the terpenes ±-pinene and (+)-3-carene, respectively, were synthesized. Complexes I and II were studied by X-ray diffraction. The crystal structures of compounds are ionic, being composed of the [Ni(HL1)]+ or [Ni(HL2)]+ cations and the outer-sphere NO3− anions. The Ni2+ ion coordinates four N atoms of the tetradentate chelating ligand, the NiN4 coordination unit being shaped like a tetrahedrally distorted square. Compounds I and II are diamagnetic, which corresponds to a low-spin d8 configuration. The NMR spectra of compounds were recorded and analyzed.