24. The following table gives the octahedral crystal field splitting energy (Δo) values for Co(III) complexes. Explain the order in terms of the σ- and π-donor and σ- and π-acceptor properties of the ligands. (10%)

21. Fe(η⁵-Cp)(η¹-Cp)(CO)₂ is a classic organometallic complex with two Cp ligands (Cp = C₅H₅⁻ = cyclopentadienyl) having different coordination modes. Note: η¹-Cp is written as κ¹-Cp in the IUPAC convention. (10%)(a) Draw the molecular structure of the complex. Remember to include H atoms and indicate double, triple, and aromatic bonds when necessary. (4%)(b) ¹H NMR spectroscopy of the complex at room temperature only shows two signals, with one from η⁵-Cp and the other from η¹-Cp. Is this result consistent with the molecular structure you draw in (a)? Explain why this is the case and what experiment you would do to verify your explanation. (6%)

24. The following table gives the octahedral crystal field splitting energy (Δo) values for Co(III) complexes. Explain the order in terms of the σ- and π-donor and σ- and π-acceptor properties of the ligands. (10%)

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