MASS-SPECTROMETRIC STUDY OF COPPER(II) BETA-DIKETONATES VAPOR THERMOLYSIS MECHANISM AND KINETICS

Vapour thermolysis processes of copper(II) bis-chelate complexes with different beta-diketones in the 160-640 degrees C temperature range we re studied by using the high-temperature source of a molecular beam wi th mass spectrometric recording of the gas phase composition directly at the outlet from the thermal reactor. Schemes of a heterogeneous dec omposition of these compounds vapour were suggested on the basis of te mperature dependences of the thermolysis gaseous products composition. It was established that the mechanisms of thermal conversion of coppe r(II) complexes with fluorinated and non-fluorinated ligands were not similar. A comparison of the thermal behaviour of the complexes with f luorinated and non-fluorinated ligands in vacuum, hydrogen and oxygen was carried out. Effective values of kinetic parameters in the Arrheni us equation were calculated for the first-order reaction on initial co mpound from the temperature dependence of the rate constant. The seque nce of copper(II) complexes with beta-diketones having different end s ubstituents according to the thermal stability was revealed from the v alues of the thermal decomposition activation energy.