   Chapter 21, Problem 87CWP

Chapter
Section
Textbook Problem

# Which of the following crystal field diagram(s) is(are) correct for the complex given?a. Zn(NH3)42+ (tetrahedral) b. Mn(CN)63− (strong field) c. Ni(SN)42− (square planar, diamagnetic) (a)

Interpretation Introduction

Interpretation: The correct crystal field diagram for the given complex is to be identified.

Concept introduction: The electrons in the d orbital of a transition metal split into high and low energy orbitals when ligands are attached to it. The energy difference between these two levels depends upon the properties of both metal and the ligands. If the ligand is strong, then splitting will be high and the complex will be low spin. If the ligand is weak, then splitting will be less and the complex will be high spin.

To determine: If the given crystal field diagram for Zn(NH3)42+ is correct or not.

The given crystal field diagram for Zn(NH3)42+ is not correct.

Explanation

Explanation

The given crystal field diagram for Zn(NH3)42+ (tetrahedral) is,

Figure 1

Although not pointing exactly at the ligands, the dxy , dyz and dxz orbitals are closer to the point charges than are the dz2 and dx2y2 orbitals in tetrahedral complexes

(b)

Interpretation Introduction

Interpretation: The correct crystal field diagram for the given complex is to be identified.

Concept introduction: The electrons in the d orbital of a transition metal split into high and low energy orbitals when ligands are attached to it. The energy difference between these two levels depends upon the properties of both metal and the ligands. If the ligand is strong, then splitting will be high and the complex will be low spin. If the ligand is weak, then splitting will be less and the complex will be high spin.

To determine: If the given crystal field diagram for Mn(CN)63+ is correct or not.

(c)

Interpretation Introduction

Interpretation: The correct crystal field diagram for the given complex is to be identified.

Concept introduction: The electrons in the d orbital of a transition metal split into high and low energy orbitals when ligands are attached to it. The energy difference between these two levels depends upon the properties of both metal and the ligands. If the ligand is strong, then splitting will be high and the complex will be low spin. If the ligand is weak, then splitting will be less and the complex will be high spin.

To determine: If the given crystal field diagram for Ni(CN)42- is correct or not.

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