Synthesis of Co(Acac)3

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Amanda Tran Date of lab: 04/25/05 Date submitted: 05/09/05 Chem 2130-3 Experiment 3: Synthesis of Co(acac-NO2)3 Introduction In this lab, Co(acac·NO2)3 is synthesized using the Co(acac)3 complex produced in Experiment 2. The Co(acac)3 complex is used as a reagent instead of acacH because acacH cannot be directly converted to 3-nitroacetylacetone. Since Co(acac)3 is not stable in HNO3, Cu(NO3)2 and acetic anhydride are used in this reaction to produce the final product, Co(acac·NO2)3. The exact mechanism of the reaction is unknown, however, it is believed to proceed as follows: 1) [pic] 2) [pic] Data and Calculations Table 1: Measurements of weights and melting point |…show more content…
Some of the product was dark green, with a plastic-like consistency while some of the product was a lighter green, with a powder/paste-like consistency. Discussion The objective of this experiment was to synthesize Co(acac-NO2)3 using Co(acac)3 complex. This demonstrated that the reactivity of a ligand is changed when it is bound to a metal. The acetylacetone-Co3+ structure is similar to the structure of benzene, allowing for an electrophilic aromatic nitration of the central carbon. Copper nitrate trihydrate and acetic acid react to form acetyl nitrate, which then reacts with Co(acac)3 in ice water and sodium acetate to form a dark green oil. This oil was solidified using ethanol to form the final product, Co(acac-NO2)3. Analysis of the product showed the melting point to be 182-187°C. Since this is lower than the literature MP, it was determined that the product was impure. 0.3510 g of the product was synthesized, a 76%

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