Lecture VI: Lanthanides Complexes in Organic Chemistry

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Which type of orbitals are implied to participate in bonding when the coordination number is 10 or 12?

d-orbitals

f-orbitals (correct)

s-orbitals

p-orbitals

Why does the tendency to hydrolysis increase with increasing atomic number for the Ce3+ ion?

Due to the decrease in charge density

Due to the expansion in radii

Due to the increase in ionic radius

Due to the contraction in radii (correct)

What property of lanthanide ions +3 favors the formation of complexes?

Low charge density

Small ionic radius

Preference for covalent bonding

High charge density (correct)

What happens to the M3+ aqua ions according to the hydrolysis equation?

They lose OH- ions Signup and view all the answers

What is the role of CAN (ceric ammonium nitrate) in organic chemistry?

Catalyst for oxidation reactions Signup and view all the answers

Why do the lanthanides form few complexes, mostly with oxygen ligands?

The unavailability of the f-orbital to form hybrid orbitals which leads to covalent bond strength. Signup and view all the answers

What is the typical coordination number of lanthanides in aqua complexes?

6 Signup and view all the answers

Why do lanthanides have little or no tendency to form complexes with π –bonding ligands?

The large size of the lanthanide elements compared to the transition elements. Signup and view all the answers

What limits the maximum coordination number of lanthanides to 9?

Use of one s orbital, three p orbitals, and all five d orbitals in the valence shell for bonding. Signup and view all the answers

Why is it difficult to explain the bonding in complexes with high coordination numbers?

The involvement of multiple types of atomic orbitals in bonding. Signup and view all the answers

Lecture VI: Lanthanides Complexes in Organic Chemistry

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Questions and Answers

Which type of orbitals are implied to participate in bonding when the coordination number is 10 or 12?

Why does the tendency to hydrolysis increase with increasing atomic number for the Ce3+ ion?

What property of lanthanide ions +3 favors the formation of complexes?

What happens to the M3+ aqua ions according to the hydrolysis equation?

What is the role of CAN (ceric ammonium nitrate) in organic chemistry?

Why do the lanthanides form few complexes, mostly with oxygen ligands?

What is the typical coordination number of lanthanides in aqua complexes?

Why do lanthanides have little or no tendency to form complexes with π –bonding ligands?

What limits the maximum coordination number of lanthanides to 9?

Why is it difficult to explain the bonding in complexes with high coordination numbers?

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