Mechanism of Thermal Decomposition of Palladium β-Diketonates Vapour on Hot surface

Abstract
The processes of thermal decomposition of palladium(II) β-diketonate complexes were investigated by a high-temperature mass spectrometric method with the use of a high-temperature molecular beam source. It was established that decomposition of the palladium complexes in gas phase processes proceeds by a radical mechanism and depends on temperature. For an additional proof of the existence of the radical particles the spin trap method was applied with a mass spectrometric identification of adducts. The following order of thermal stability of the complexes in gas phase was established : [MATH]. This order is reverse to the thermal stability in a solid state. The thermal decomposition of Pd(aa)₂ and Pd(hfa)₂ complexes in deuterium showed that the deuterium presence strongly accelerates the decomposition processes.