The molecular structures of Cr(acac)3 and Fe(acac)3 are quite different from that of Mn(acac)3. What are...

The molecular structures of Cr(acac)₃ and Fe(acac)₃ are quite different from that of Mn(acac)₃. What are these structures? What is the true structure of the so-called manganic acetate? Please explain thoroughly.

Expert Solution

Metal acetylacetonates are coordination complexes derived from the acetylacetonate anion (CH
3COCHCOCH−3) and metal ions, usually transition metals. The bidentate ligand acetylacetonate is often abbreviated acac. Typically both oxygen atoms bind to the metal to form a six-membered chelate ring.

Chromium(III) acetylacetonate, Cr(acac)₃, with the formula Cr(C₅H₇O₂)_3, is a typical octahedral complex containing three acac⁻ ligands. Like most such compounds, it is highly soluble in nonpolar organic solvents. This particular complex, which has a three unpaired electrons, is used as a spin relaxation agent to improve the sensitivity in quantitative carbon-13 NMR spectroscopy. The compound is prepared by the reaction of chromium(III) oxide with acetylacetone (Hacac):

Cr₂O₃ + 6 Hacac → 2 Cr(acac)₃ + 3 H₂O

Iron(III) acetylacetonate, Fe(acac)₃, is a red high-spin complex that is highly soluble in organic solvents. It is a configurationally labile, high-spin complex with five unpaired electrons. It is occasionally used as a catalyst precursor. Fe(acac)₃ is prepared by treating freshly precipitated Fe(OH)₃ with acetylacetone.

Fe(OH)₃ + 3 HC₅H₇O₂ → Fe(C₅H₇O₂)₃ + 3 H₂O

manganese(II) acetylacetonate, Mn(acac)_2, has been prepared by the comproportionation of the manganese(II) compound Mn(acac)₂ with potassium permanganate in the presence of additional acetylacetone.

The true Structure of Mn(acac)₃ is in the Image...................................

queen_honey_blossom answered 1 year ago

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