No abstract

The crystal and molecular structure of chloro(2,2',2"-terpyridine)palladium(II)-chloride dihydrate, C15HtsC12N302Pd, has been determined by single crystal X-ray diffraction techniques. The crystals are orthorhombic: space group Pna21, a = 17-217(9), b = 14"026(8), c = 6-801(5)/~, Z = 4. Least-squares refinement of 2064 non-zero manually gathered diffractometer reflexions was carried out to a conventional unweighted R of 0.069. The molecule consists of a basically planar 4-coordinate [Pd(terpy)C1] § cation and a CI-anion. The molecules are packed in a layer structure in which the average separation is about 3.4 /~, the closest approach being 3.13/~ between a palladium atom and one of the nitrogen atoms of a neighboring molecule. Bond distances are within acceptable limits of predicted values. Deviations from planarity in the coordinated terpyridine ligand are presumably due to its steric limitations and are similar to those found in other terpyridine complexes.