Thermal study of palladium complexes with trans-1,2-diaminecy clohexanetetraacetic acid

Thermal decomposition processes for cyclohexanediaminetetraacetic acid (CDTA-H₄) complexes of palladium, Pd(CDTA-H₂)] and Pd(CDTA-H₄)Cl₂]·2 HCl·2 H₂O have been studied using TG—DTA techniques. Infrared spectroscopy and X-ray diffraction have been also used for the characterization of intermediate and final products. In the decomposition of the dichloro complex, chloride ions are released simultaneously to a ring closure reaction in which CDTA becomes tetradentate. For both compounds, the final product in the decomposition is PdO, as confirmed by the X-ray difraction pattern of a sample heated at 600°C.