Synthesis of Metal Acetylacetonte Complexes金属乙酰丙酮配合物的合成.docVIP

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Synthesis of Metal Acetylacetonte Complexes金属乙酰丙酮配合物的合成.doc

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Synthesis of Metal Acetylacetonte Complexes金属乙酰丙酮配合物的合成

Synthesis of Metal Acetylacetonate Complexes Background. In this experiment you will prepare and characterize complexes of 2 metal ions with the anion of acetylacetone. Acetylacetone (2,4-pentanedione) is a typical ?-diketone that can ionize in aqueous solution as a weak acid: The resulting acetylacetonate anion (abb. acac) can serve as a ligand to metal ions, forming complexes in which the ligand is bonded to the metal through both oxygen atoms to form a six-membered ring. The six-membered rings (MO2C3) are planar and weakly aromatic because they contain 6 ? electrons. In complexes of stoichiometry M(acac)3, the MO6 array is octahedral; in Cu(acac)2, the CuO4 group is square planar; and in VO(acac)2, the VO5 group is square pyramidal. In general the complexes are neutral and may be isolated as crystalline solids having an interesting variety of colors. In pure acetylacetone, or solutions of acetylacetone in non-polar organic solvents, the diketo form is in equilibrium with a cyclic enol-like form. This second tautomer may be regarded as a complex in which the proton takes the role of the metal ion Mn+. Synthesis and Characterization of Metal Acetylacetonates Synthetic Procedures We would like you to carry out syntheses of two metal acetylacetonate complexes, according to the following plan: Al3+ and Cr3+ Fe3+, Co3+ Co3+, and the nitration of the Co3+ Characterization of Products In the case you carry out a.: determine the melting points of your 2 products. Next, record the IR spectrum, using the KBr pellet technique. Label and number the spectra and assign the sore thumb bands. Finally, measure the magnetic susceptibility. In the case you carry out b.: determine the melting points of your 2 products. Next, record the IR spectrum, using the KBr pellet technique. Label and number the spectra and assign the sore thumb bands. Finally, measure the magnetic susceptibility. In the case you carry out c.: determine the melting points of your 2 products. Next, record the