Chapter 9, Problem 9C.20E

Interpretation Introduction

Interpretation:

The possible isomers for the complex $\left[\text{Fe}{\left(\text{Cl}\right)}_{\text{2}}{\left({\text{NH}}_{\text{3}}\right)}_{\text{3}}\left(\text{SCN}\right)\right]$ have to be given.

Concept Introduction:

Isomers:

The compounds with same molecular formula but differ in the arrangement of the atom are said to be isomers.

Linkage isomers:

Linkage isomerism occurs with ambidentate ligands that are capable of coordinating in more than one way.

Example:

${\text{SCN}}^{\text{-}}{\text{/NCS}}^{\text{-}}$.  The only difference is the atoms bind to the central ion.  The ligand must have more than one donor atom but bind to ion in only one place.

Geometrical isomers:

If there is restricted rotation in a molecule there arises geometric isomerism.  Geometric isomers are also known as Cis- trans isomerism.

• If the two atoms locked in same side of the molecule then it is called as cis isomers.
• If the two atoms locked in opposite side of the molecule then it is called as trans isomers.