How to Compare the Coordination Complex Stability – Part 3

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).

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.

Question:

Arrange the following in the increasing order of Kf: [Ni(en)3]2+, [Ni(EDTA)]2−, & [Ni(NH3)6]2+.

Solution infographic:



Click/tap to enlarge the image

Kf  = Equilibrium constant for the complex formation

Complexes no longer seem to perplex❓ Let Chemaficionado know in the comments below or at mychemistryhomework@gmail.com❗

References:

(1)    Wikipedia Contributors. Coordination complex. Wikipedia. https://en.wikipedia.org/wiki/Coordination_complex.

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

(3)    6.14: The Chelate Effect. Chemistry LibreTexts. https://chem.libretexts.org/Courses/Northern_Michigan_University/CH_215%3A_Chemistry_of_the_Elements_Fall_2023/06%3A_Transition_Metals_and_Coordination_Chemistry/6.14%3A_The_Chelate_Effect.

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