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[[File:Me-EN.svg|thumb|[[Ethylenediamine]] [[ligand]] chelating to a metal with two bonds]]
[[Image:Cu chelate.svg|thumb|Cu<sup>2+</sup> [[Coordination complex|complexes]] with nonchelating [[methylamine]] (left) ''and'' chelating [[ethylenediamine]] (right) ligands]]
The chelate effect is the greater affinity of chelating ligands for a metal ion than that of similar nonchelating
The thermodynamic principles underpinning the chelate effect are illustrated by the contrasting affinities of [[copper]](II) for [[ethylenediamine]] (en) vs. [[methylamine]].
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