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What might cause the h2o ligand in chromium 3+ to be stronger than ethylenediamine
Accepted Answer
In general, ethylenediamine (en) forms stronger complexes with metal ions like Cr3+ than water (H2O) due to its ability to act as a bidentate ligand. This means it can bind to the metal ion at two points, forming a chelate ring. Chelate rings increase the stability of the complex due to the chelate effect. The increased stability arises from entropic factors, as forming a chelate complex releases more water molecules from the metal ion's coordination sphere. This leads to a higher degree of disorder in the system, which is entropically favorable. Therefore, it is less likely that H2O would be a stronger ligand than ethylenediamine in a Cr3+ complex.
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