How to Compare the Coordination Complex Stability – Part 2

A coordination complex is a chemical compound made of a central atom/ion (usually metallic) called the coordination center and a surrounding array of bound molecules/ions referred to as ligands or complexing agents.


Coordination complexes typically having transition metals or d-block elements in the periodic table are known as metal-ligand complexes (MLCs). A ligand's stability depends on its basicity.

Chelation, a type of bonding and sequestration of metal atoms, involves ≥ 2 separate dative/coordinate covalent bonds between a ligand and a metal atom, forming a ring.

Let's recall that the second law of thermodynamics establishes the concept of entropy as a physical property of a thermodynamic system. Entropy is a measure of disorder.

Question: 

Arrange the following in the increasing order of stability: [Cr(en)3]3+, [CrCl6]3−, [CrF6]3−, & Cr(NH3)6]3+.

Solution:



Click to enlarge the image

Looks convincing❓ Let Chemaficionado know at mychemistryhomework@gmail.com❗

References:

(1)    Lancashire, R. Chelation. Chemistry LibreTexts. https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Supplemental_Modules_and_Websites_(Inorganic_Chemistry)/Coordination_Chemistry/Complex_Ion_Equilibria/Chelation.

‌(2)    Wikipedia Contributors. Entropy. Wikipedia. https://en.wikipedia.org/wiki/Entropy.

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