Dichlorido(o-phenylenediamine)palladium(II)

Abstract

}], lies on a twofold rotation axis and has a square-planar coordination environment defined by two N atoms of an o-phenylenediamine ligand and two Cl À ions. In the crystal, the planar Pd complex molecules are stacked parallel to the c axis, resulting in a columnar structure. In the column, an infinite almost straight Pd chain is formed, suggesting weak metal-metal interactions. The crystal packing is stabilized by a three-dimensional N-HÁ Á ÁCl hydrogen-bonding network between the amino groups and the Cl ligands of adjacent molecules. Structure descriptionThe molecular structure of the title compound is displayed in Fig. 1. Its asymmetric unit comprises half of a [PdCl 2 {(C 6 H 4 )(NH 2 ) 2 }] molecule, the other half being completed by application of a twofold rotation operation. The Pd II atom is coordinated by two N atoms of an o-phenylenediamine molecule and two Cl À ions in a slightly distorted square-planar configuration (Table 1) The shorter intermolecular PdÁ Á ÁPd distance of the title compound suggests that the columnar structure is stabilized by weak metal-metal interactions. The columnar structure of the title compound is further stabilized by intermolecular N-HÁ Á ÁCl hydrogen bonds between adjacent molecules in the column (Fig. 2 and Table 2). Intercolumnar hydrogen bonds also help to stabilize the crystal packing of the columns (Fig. 3 and Table 2). Synthesis and crystallizationTo an aqueous HCl solution (1.0 M, 20 ml) of K 2 [PdCl 4 ] (0.050 mmol, 16 mg) was slowly added an aqueous HCl solution (1.0 M, 20 ml) of o-phenylenediamine (0.050 mmol, Figure 2