Research Article: A second monoclinic polymorph of (pyridine-2-carboxaldehyde oximato-κ2N,N′)(pyridine-2-carboxaldehyde oxime-κ2N,N′)palladium(II) chloride

Date Published: February 01, 2012

Publisher: International Union of Crystallography

Author(s): Kwang Ha.


The asymmetric unit of the title compound, [Pd(C6H5N2O)(C6H6N2O)]Cl, contains one half of a cationic PdII complex and a Cl− anion, with a crystallographic mirror plane parallel to the ac plane passing through the Pd and Cl atoms. In the complex, the PdII ion is four-coordinated in a distorted square-planar environment by four N atoms derived from the two chelating ligands. The hy­droxy H atom lies on the mirror plane and so is equidistant from the O atoms. This indicates that the negative charge is delocalized over the two O atoms. The complex mol­ecules are stacked in columns along the c axis and are connected by C—H⋯O hydrogen bonds, forming a three-dimensional network. The structure reported herein represents a new monoclinic polymorph of the previously reported monoclinic (C2/c) form [Torabi et al. (2007 ▶). Z. Kristallogr. New Cryst. Struct. 222, 197–198].

Partial Text

For the C2/c polymorph of the title compound, see: Torabi et al. (2007 ▶). For the crystal structure of the related complex [PdCl2(C6H6N2O)], see: Ha (2011 ▶).