Chiral Complexes of PdCl2 with Hydroxypyrazolylquinoline and Pyrazolylquinoline Based on the Monoterpenoid (+)-3-Carene: Synthesis and Structures

摘要

The chiral complexes [PdL~1Cl2] (I) and [PdL~2Cl2] (II) (where L~1 and L~2 are hydroxypyrazolylquinoline and pyrazolylquinoline, respectively, based on the monoterpenoid (+)-3-carene) were obtained and examined using X-ray diffraction. The crystal structures of complexes I and II are built from mononuclear acentric molecules. The Pd~(2+) ions coordinate two N atoms of the chelating bidentate ligand L~1 or L~2 and two Cl atoms. The coordination polyhedron Cl2N2 is a square distorted in a tetrahedral manner. In structure I, adjacent molecules are linked by intermolecular contacts and hydrogen bonds Cl···H-O, which gives rise to chains aligned with the axis x. In structure II, contacts that are substantially shorter than the van der Waals interactions were not detected.