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Chapter 23: Problem 59

Sketch the stereoisomers of the square planar complex ion \(\mathrm{CuCl}_{2} \mathrm{Br}_{2}^{2-} .\) Are any of these isomers chiral?

Short Answer

Expert verified
Answer: There are two stereoisomers for the square planar complex ion \(\mathrm{CuCl}_{2}\mathrm{Br}_{2}^{2-}\) (cis and trans). None of them are chiral.

Step by step solution

01

Identify coordination number and geometry

The coordination number is the number of ligands attached to the central metal atom. In this case, we have a coordination number of 4, with two chlorides and two bromides. The geometry of the complex can be predicted based on the coordination number. For a coordination number of 4, it's common for the complex to adopt a square planar geometry.
02

Draw the main square planar structure

Draw the core structure of the square planar complex with the copper (Cu) atom in the center and four unspecified ligands around it, with one ligand in each corner of the square.
03

Generate ligand arrangements

Now, we need to generate the possible arrangements of the ligands (Cl and Br) around the copper atom. There are three possible arrangements: 1. Cl atoms on opposite corners and Br atoms on the other opposite corners (cis isomer). 2. Cl atoms are adjacent to each other, and Br atoms are also adjacent to each other (trans isomer).
04

Step 4:Sketch the isomers

Draw the cis and trans isomers based on the ligand arrangements described in step 3. Label the Cl and Br ligands accordingly. Cis isomer: ``` Cl | Cl-Cu-Br | Br ``` Trans isomer: ``` Cl | Br-Cu-Cl | Br ```
05

Identify chiral isomers

Chiral isomers are molecules that have non-superimposable mirror images. In a square planar complex such as this, none of the isomers are chiral. This is because both the cis and trans isomers have planes of symmetry. So, in summary, we have two stereoisomers for the square planar complex ion \(\mathrm{CuCl}_{2}\mathrm{Br}_{2}^{2-}\) (cis and trans). None of them are chiral.

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