Nickel(II) and Copper(II) Complexes with Chiral Bis-α- thiooxime, the Derivative of Natural Terpenoid (+)-3-Carene: Synthesis and Structures

摘要

Chiral bis-α-thiooxime (H2L~1), the derivative of the natural monoterpenoid (+)-3-carene, was synthesized and used to prepare paramagnetic complexes of the composition M(H2L~1)Cl2 (M = Ni, Cu). The crystal structures of [Ni(H2L~1)(Cl2] (I) and [CuCH2L~1)Cl2] (II) were determined by X-ray diffraction analysis. Crystals I and II consist of mononuclear acentric molecules. The Ni~(2+) ion in a molecule of complex I coordinates two N atoms and two S atoms of a tetradentate chelating ligand (the H2L~1 molecule) and two Cl atoms. The NiCl2N2S2 coordination core forms octahedron compressed along the apical N atoms. In a molecule of complex II, the Cu~(2+) ion coordinates two S atoms and the N atom of a tridentate chelating H2L~1 ligand and two Cl atoms. The CuCl2NS2 coordination core forms a trigonal bipyramid.