Synthesis, structure, and properties of nickel(II) and cobalt(II) coordination compounds with optically active diaminodioxime (H2L) derived from 3-carene. Molecular and crystal structures of the [Ni(H2L)(NO3)]NO3 and [Ni(HL)]ClO4 center dot H2O complexes

Nickel(II) and cobalt(II) complexes with optically active diaminodioxime (H2L, the derivative of 3-carene) of the compositions [Ni(H2L)NO3]NO3 (1), Ni(H2L)Cl-2 (II), [Ni(HL)]ClO4 (.) H2O (III), and Co(H2L)Cl-2 (IV), were synthesized. According to X-ray diffraction data, the structures of the paramagnetic compound I and diamagnetic complex III are ionic. In the cation of I, the distorted NiN4O2 octahedron is formed by the N atoms of the tetradentate cyclic ligand (H,L molecule) and by the O atoms of NO3- anion functioning as bidentate cyclic ligands. In the cation of III, the NiN4 coordination unit is a distorted square formed upon coordination of the tetradentate cyclic ligand, HL- anion. The data of magnetochemistry and UV-Vis, IR, and Raman spectroscopy suggest that paramagnetic complexes H and IV contain a distorted octahedral polyhedron MCl2N4 (M = Ni, Co).