Synthesis, structure and spontaneous resolution of [Pd2Cl2(DpyF)2] (DpyF− = anion of bis(2-pyridyl)formamidine); a new chelating/bridging bonding mode of DpyF− ligand

Reaction of [PdCl2(CH3CN)2] with HDpyF (HDpyF = bis(2-pyridyl)formamidine) in CH3CN afforded a yellow product [Pd2Cl2(DpyF)2] which was characterized by X-ray crystallography. The DpyF− ligand coordinates to the Pd atoms in a new tridentate fashion, forming a chelating and a bridging bonding modes. The molecules are chiral due to the ligand constraints. Spontaneous resolution of the racemic product can be achieved by crystallization of the yellow product in CH3CN/ether, and a CD spectrum can be obtained.