Thermal Stability of Bis-Piperidine Benzoylacetonates of Some Transition Metals

Bis-piperidine complexes of benzoylacetonates of Mn(II), Co(II), Cd(II) and Ni(II) were prepared. Thermogravimetric analysis (TG) demonstrated that Mn(II) bis-piperidine benzoylacetonate was stable up to 90°C, while Co(II) bis-piperidine benzoylacetonate was stable up to 100°C, whereas Cd(II) bis-piperidine benzoylacetonate was stable up to only 50°C. Its first decomposition step was completed at 110°C. Ni(II) bis-piperidine benzoylacetonate found to be stable up to 110°C. The stabilities of the complexes of these metals therefore follow the sequence Cd²⁺<Mn²⁺<Co²⁺<Ni²⁺. The complex of Cd(II) was the least stable of all the compounds studied.This revised version was published online in November 2005 with corrections to the Cover Date.