Organometallic Reactions Part 1: Ligand Substitution and the Trans Effect

The video tutorial covers ligand substitution in transition metal complexes, explaining associative, dissociative, and interchange processes. It discusses oxidative and reductive activation, metal-ligand bond strength, and the trans influence and effect. The cis effect is also introduced, with examples to illustrate these concepts.

Which type of ligand substitution process involves a new ligand joining the complex before another ligand leaves?

• Reductive process

• Interchange process

• Associative process

• Dissociative process

What is the preferred electron count for complexes undergoing associative ligand substitution?

• 20 electrons

• 14 electrons

• 16 electrons

• 18 electrons

In ligand exchange, what happens when the LUMO is non-bonding or modestly anti-bonding?

• Both oxidation and reduction are equally likely

• Oxidation is likely

• Reduction is likely

• No electron transfer occurs

Which type of activation involves the complex gaining an electron?

• Reductive activation

• Oxidative activation

• Dissociative activation

• Associative activation

What is a key factor that makes metal-ligand bonds weaker than carbon-ligand bonds?

• Higher bond dissociation energies

• Lower bond dissociation energies

• Stronger π-bonding

• Greater electron density

Which ligands tend to form stronger bonds with metals, according to the slippage phenomenon?

• Anionic ligands

• Neutral ligands

• Polyraptor ligands

• Single donor ligands

What does the trans effect primarily influence in ligand exchange reactions?

• Electron count

• Ligand stability

• Kinetics

• Thermodynamics

Which ligand is most likely to be replaced in a complex with a strong trans effect ligand?

• The ligand with the strongest bond

• The ligand with the weakest bond

• The ligand trans to the strong trans effect ligand

• The ligand adjacent to the strong trans effect ligand

What is the main difference between the trans effect and the cis effect?

• The cis effect is stronger than the trans effect

• The trans effect is stronger than the cis effect

• The trans effect is related to thermodynamics

• The cis effect is related to kinetics

In a ligand exchange reaction, which effect is more likely to be ignored unless it is the only relevant phenomenon?

• Trans effect

• Cis effect

• Slippage effect

• Electron effect