Polynuclear Transition Metal Complexes

The video tutorial explores polynuclear transition metal complexes, focusing on bridging ligands and their electron contributions. It explains the 18 electron rule using molybdenum complexes as examples and discusses the structure prediction of iridium complexes. The tutorial also covers uranium and ruthenium complexes, highlighting the importance of electron counting and metal-metal bonding in achieving stable structures.

What is a key characteristic of bridging ligands in polynuclear complexes?

• They contribute the same number of electrons as when bound to a single metal.

• They can only bind to one metal center.

• They contribute more electrons than when bound to a single metal.

• They always have a positive charge.

In a molybdenum complex with bridging chlorines, what is the oxidation state of each molybdenum center?

• 0

• +2

• +1

• -1

How many electrons does a bidentate phosphine ligand contribute to a metal center?

• 4 electrons

• 8 electrons

• 2 electrons

• 6 electrons

What is the oxidation state of iridium in a complex with a CP ligand and a carbonyl?

• +1

• +2

• 0

• +3

In an iridium complex, how many electrons does the CP ligand contribute?

• 4 electrons

• 7 electrons

• 5 electrons

• 6 electrons

In a uranium complex with bridging chlorines, what is the total electron count for each metal center before adding metal-metal bonds?

• 17 electrons

• 16 electrons

• 19 electrons

• 18 electrons

How many carbonyl ligands are typically bound to each ruthenium atom in a symmetrical complex with three ruthenium atoms?

• 2 carbonyls

• 3 carbonyls

• 4 carbonyls

• 5 carbonyls