Ae. Turgambaeva et al., MASS-SPECTROMETRIC STUDY OF COPPER(II) BETA-DIKETONATES VAPOR THERMOLYSIS MECHANISM AND KINETICS, Journal de physique. IV, 5(C5), 1995, pp. 221-228
Vapour thermolysis processes of copper(II) bis-chelate complexes with
different p-diketones in the 160-640 degrees C temperature range were
studied by using the high-temperature source of a molecular beam with
mass spectrometric recording of the gas phase composition directly at
the outlet from the thermal reactor. Schemes of a heterogeneous decomp
osition of these compounds vapour were suggested on the basis of tempe
rature dependences of the thermolysis gaseous products composition. It
was established that the mechanisms of thermal conversion of copper(I
I) complexes with fluorinated and non-fluorinated ligands were not sim
ilar. A comparison of the thermal behaviour of the complexes with fluo
rinated and non-fluorinated ligands in vacuum, hydrogen and oxygen was
carried out. Effective values of kinetic parameters in the Arrhenius
equation were calculated for the first-order reaction on initial compo
und from the temperature dependence of the rate constant. The sequence
of copper(II) complexes with p-diketones having different end substit
uents according to the thermal stability was revealed from the values
of the thermal decomposition activation energy.