   Chapter 22, Problem 37PS

Chapter
Section
Textbook Problem

Determine whether the following complexes have a chiral metal center.(a) [Fe(en)3]2+(b) trans-(Co(en)2Br2]+(c) fac-[Co(en)(H2O)Cl3](d) square-planar Pt(NH3)(H2O)Cl(NO2)

Interpretation Introduction

Interpretation: The metal centers of the given compounds are chiral has to be determined.

Concept introduction:

Geometry of coordination compounds: The study of geometry of the coordination compound helps in understanding the physical and chemical property of the compound.

Stereoisomer: The same molecular formula but different with the arrangements of atoms around the metal ion. The Ligands are arranged differently in coordination compounds.

Optical isomers: Optical isomers are non-superimposable mirror images.

Plane-polarized light: Light that oscillates in a single plane.

Explanation

Correct option:

1. a) Fe2+ is a chiral center
2. b) Co3+ is a chiral center
3. c) Co3+ is a chiral center

Reason for correct option:

(a)

If a pair of compound which are non-superimposable mirror images is known as optical isomers. Isomers are always comes in pair and their physical and chemical properties are same. The optical isomers change the plane-polarized light and said to be optical active.

Each of the ethylenediamine ligand forms two coordination bonds with metal ions to form a complex. The ethylenediamine is a bidentate ligand, where each ligand (gives rise to two coordinate bond) bonded to metal ion. So the isomer gives two optical isomers (non-superimposable mirror image). Therefore, Fe2+ is a chiral center.

(b)

If a pair of compound which are non-superimposable mirror images is known as optical isomers. Isomers are always comes in pair and their physical and chemical properties are same. The optical isomers change the plane-polarized light and said to be optical active.

Each of the ethylenediamine ligand forms two coordination bonds with metal ions to form a complex. The ethylenediamine is a bidentate ligand, where each ligand (gives rise to two coordinate bond) bonded to metal ion. So the isomer gives two optical isomers (non-superimposable mirror image). Therefore, Co3+ is a chiral center

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