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Synthesis and Characterization of Cobalt Acetylacetonate

 

            
             Acetylacetone was added to dissociate Co(II) to form the pink ionic salt complex Co(II)(acacH)3. Hydrogen peroxide was introduced which effected deprotonation of acacH enol form to bidentate acac allowing a stronger, more stable ion, [Co(acac)3]- to form . Hydrogen peroxide also reacted to oxidize Co(II) to Co(III) which ended in the resultant compound Co(acac)3. 1.
             Melt range was employed to conclude if the expected product had been obtained and how pure it was by comparison to the pure product melt range of 210C - 213C.2 Ultraviolet and visible light spectroscopy was used to determine that the extinction coefficients lay within the defined range of 103 C 105.1 Infrared spectroscopy was utilized to conclude that the intermolecular bond activity was consistent with expected, pure Co(acac)3 bonds.13 Nuclear magnetic resonance was used to establish that the hydrogen atom interactions of the molecule were in the correct one to six (1:6) CH to CH3 ratio present in pure Co(acac)3.14 The results gave a high percent yield (77.6%), a low percent error (0.469%), and showed a very pure product by comparison.
             Introduction .
             Background.
             Transitional metal oxide nanoparticles have become the focus of much research and development in recent years due to the significant alteration of their properties at the nanometer scale and the ability to tailor their geometry; use of environmentally friendly procedures has become the norm.9 Metal acetylacetonates have been instrumental to this study as they have been used as the general precursors to transition metal oxide nanomaterial synthesis.10 Cobalt was chosen for this experiment due to its instability which has caused to be easily oxidizable.1 The chelating acetylacetone ligand has been used for stabilization of Cobalt in Co(acac)3 synthesis due to its strong binding quality12 and relative environmentally friendly disposal.11 Without another moderately strong oxidizing agent, in this case hydrogen peroxide (H2O2), conversion to Co(acac)3 has been shown to occur slowly.


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