Preparation, Tests and Analysis of Manganese III Acetylacetonate

1 Preparation, tests and analysis of manganese (III) acetylacetonate (pentane-2,3-dioate) 

This is one of the more stable complexes of Mn(lII), whose stability is related not only to the chelate and resonance effects but also to its non-ionic character and hence its insolubility in water. However it is soluble in organics. 

Use either of the two methods described later to determine the % Mn in your preparation and hence its % purity. 

To about 0.1 g portions add separately 3 cm of each of the following solutions and shake  

Unlike the previous complex, the trisoxalato-complex is moisture- and light-sensitive. Hence the necessity to adhere strictly to the instructions for the preparation, which involves the oxidation of the manganese (11) formed in the initial step (reduction of permanganate by oxalic acid). The second step ie the oxidation of Mn(II) by permanganate has to be done at below 0°C to avoid the thermal decomposition of the complex formed. Analysis is similar to the earlier complex. 

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