(2,3-Di-2-pyridylpyrazine-κ2N2,N3)diiodidopalladium(II)

The Pd-II ion in the title complex, [PdI2(C14H10N4)], is four-coordinated in a slightly distorted square-planar environment by the two pyridine N atoms of the chelating 2,3-di-2-pyridylpyrazine (dpp) ligand and two iodide anions. In the crystal, the pyridine rings are considerably inclined to the least-squares plane of the PdI2N2 unit [maximum deviation = 0.090 (2) angstrom], making dihedral angles of 65.0 (2) and 66.6 (2)degrees. The pyrazine ring is perpendicular to the unit plane, with a dihedral angle of 89.9 (2)degrees. The complex molecules are connected by C-H center dot center dot center dot I hydrogen bonds, forming a helical chain along the b axis.