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 (1) and [Ni(HL2)]NO3 (.) H2O (II) containine, the anions of chiral diaminodioximes, H2L1 and H2L2, derived from the terpenes alpha-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 11 are diamagnetic, which corresponds to a low-spin d(8) configuration. The NMR spectra of compounds were recorded and analyzed.