Polynuclear Transition Metal Complexes

The tutorial explores polynuclear transition metal complexes, focusing on bridging ligands and their electron contributions. It explains the 18-electron rule using examples of molybdenum, iridium, and rhenium complexes. The tutorial concludes with a discussion on a ruthenium complex, highlighting the role of metal-metal bonds and spectroscopy in determining structures.

What is a polynuclear transition metal complex?

• A complex with a single metal center

• A complex with multiple metal centers

• A complex with no metal centers

• A complex with only organic ligands

What is the role of a bridging ligand in a polynuclear complex?

• It only coordinates to organic ligands

• It does not coordinate to any metal center

• It coordinates to more than one metal center

• It coordinates to only one metal center

How many electrons does a bridging hydrogen contribute to a polynuclear complex?

• One electron

• Two electrons

• Three electrons

• Four electrons

In a molybdenum complex with two metal centers, what is the typical electron count for each center before forming a metal-metal bond?

• 16 electrons

• 17 electrons

• 18 electrons

• 19 electrons

What is the oxidation state of molybdenum in the given complex example?

• +4

• +1

• +2

• +3

In the iridium complex example, what charge does the Cp ligand carry?

• Minus two

• Plus one

• Minus one

• Neutral

How many valence electrons does iridium have in the given complex?

• 10 valence electrons

• 8 valence electrons

• 7 valence electrons

• 9 valence electrons

In the rhenium complex, what is the total electron count for each metal center before forming a metal-metal bond?

• 18 electrons

• 15 electrons

• 16 electrons

• 17 electrons

How many carbonyl ligands are coordinated to each ruthenium atom in the given example?

• Five carbonyls

• Two carbonyls

• Three carbonyls

• Four carbonyls

What is the electron count for each ruthenium atom in the given complex?

• 15 electrons

• 14 electrons

• 18 electrons

• 16 electrons