Cis configuration

Definition

Cis configuration describes the arrangement of two identical or similar ligands adjacent to each other in a coordination complex. It is commonly seen in square planar and octahedral geometries.

5 Must Know Facts For Your Next Test

1. In a cis configuration, ligands are positioned 90 degrees apart from each other.
2. This configuration contrasts with the trans configuration, where identical ligands are 180 degrees apart.
3. Cis configurations can lead to different chemical reactivity and physical properties compared to trans configurations.
4. An example of cis configuration is found in cisplatin, a chemotherapy drug, where two chloride ions are adjacent.
5. The stability and color of coordination complexes can be influenced by whether they adopt a cis or trans configuration.

Review Questions

• What is the key difference between cis and trans configurations in a coordination complex?
• In what type of geometrical arrangements are cis configurations most commonly found?
• How does the position of ligands in a cis configuration affect the properties of a coordination complex?

Related terms

Trans Configuration: Arrangement where two identical or similar ligands are opposite each other at a 180-degree angle in a coordination complex.

Ligand: An ion or molecule that binds to a central metal atom to form a coordination complex.

Coordination Number: The number of ligand atoms that are bonded directly to the central metal ion in a coordination complex.