Chapter 21, Problem 21.63SP

Interpretation Introduction

(a)

Interpretation:

The coordination number of ${\left[{\text{Ni(CN)}}_{\text{5}}\right]}^{3-}$ needs to be determined.

Concept introduction:

Coordination number is the atoms surrounding the central atom in a complex. It indicates the number of atoms or molecules bonded to it. The forces that hold these complexes are coordinate bonds. It could be cationic or anionic depending on negative or positive ligands. By looking out for double or triple ligands, the coordination number is calculated.

Interpretation Introduction

(b)

Interpretation:

The coordination number of ${\text{Ni(CO)}}_4$ needs to be determined.

Concept introduction:

The atoms or molecules attached to the central atoms using coordinate bonds is the coordination number.

To calculate coordination number, it is required to see what type of bonds are attached namely whether it is bidentate, tridentate namely double bonds or triple bonds.

Interpretation Introduction

(c)

Interpretation:

The coordination number of ${\left[{\text{Co(en)}}_2{\text{(H}}_{\text{2}}\text{O)Br}\right]}^{2+}$ needs to be determined.

Concept introduction:

The central atom is attached to ligands, which could be positive, or negative using coordinate bonds and these complexes are called as coordination bond. The coordination number is computed by knowing the number of ligands and whether there is a double or triple bond.

Interpretation Introduction

(d)

Interpretation:

The coordination number of ${\left[{\text{Cu(H}}_{\text{2}}{\text{O)}}_2{{\text{(C}}_{\text{2}}{\text{O}}_4\text{)}}_2\right]}^{2-}$ needs to be determined.

Concept introduction:

When the central atom is attached to ligands which are bidentate or tridentate atoms through coordinate bonds, the number indicated as coordination number. The ligand could be positive or negative. The calculation of coordination number is executed by bidentate, tridentate, or hexadentate ligands that could be double bonds or triple bonds.

Interpretation Introduction

(d)

Interpretation:

The coordination number of ${\text{Co(NH}}_3{\text{)}}_3{\text{ (NO}}_2{\text{)}}_3$ needs to be determined.

Concept introduction:

If the central atom is attached to other atoms or ligands using coordinate bonds, it is termed as coordination number. For calculating the coordination number, it requires for checking bidentate, tridentate ligands and verifying for single, double or triple bonds.