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nickel acetate tetrahydrate is an inorganic compound of nickel and acetic acid, usually found as a tetrahydrated form. It is used in the aluminium anodization industry and as a catalyst in various chemical processes. It is also used in the synthesis of polynuclear-nickel polyoxotungstate cluster compounds, which are useful in designing molecular magnets.
During thermal decomposition, Ni(CH3COO)2*4H2O undergoes a complete transformation at 500degC into a gemisch aus Ni and NiO, which is then characterized using thermogravimetry (TG), differential thermal analysis (DTA) and IR-spectroscopy. In the initial stage, water releases acetate groups, which are hydrolysed by free acetic acid and evolved into the gas phase. In the next step, the anhydrous acetate is converted into NiCO3, which liberates CH3COCH3 and decomposes (at 365degC) to give NiO(s), CO2(g) and CO(g).
A further heating up to 373degC generates a mixture of Nio and NiO. The thermal decomposition of nickel carboxylates has become a possible route to synthesise nanoparticles with high surface area and thus suitable for catalytic purposes [7]. These particles should be in the range 1-3 nm for maximum efficiency. However, it is not always easy to synthesize metal nanoparticles from a single source. Hence, there is an urgent need for further characterization of the thermal decomposition course of nickel carboxylates in order to identify and exploit their potential. To this end, a series of studies combining thermogravimetry, differential thermal analysis and IR-spectroscopy have been carried out to elucidate the thermal decomposition path of nickel acetate.