Abstract
The thermal decomposition of vanadium, chromium, manganese, iron, cobalt and nickel metallocenes in vacuum has been studied. Kinetic parameters of the process have been calculated. It was established that the thermal stability of the electron-deficient π-complexes of metals to the left of the Periodic System changes in parallel with the thermodynamic functions of the metalring bond dissociation and decreases in the order: Cp 2V > Cp 2Cr > Cp 2Mn. Thermal stability of metallocene analogues of iron-triad, governed more by electronic structure than thermodynamic factors, decreases in the order: Cp 2Fe > Cp 2Co > Cp 2Ni. It has been found that metallocene pyrolysis in a closed system is a homogeneous—heterogeneous process occurring both in a volume and on a surface. The catalytic activity of solid decomposition products has been observed.
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