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Which coordination complex would represent peak of lowest wavelength. [crcl6]3- [cr(h2o)6]3+ [cr(en)3]3+ [cr(ox)3]3+
Accepted Answer
The coordination complex [Cr(ox)3]3- would likely have the lowest wavelength peak. Here's why:
Ligand Field Theory: The color of transition metal complexes arises from the splitting of d orbitals by ligands. Strong-field ligands cause a larger splitting, leading to higher energy transitions and shorter wavelengths (more blue light absorbed, hence more red-orange light transmitted).
Ligand Strength: The oxalate ion (ox) is a strong-field ligand, while water (H2O) and ethylenediamine (en) are weaker field ligands. Chloride (Cl-) is a weak-field ligand.
Therefore, [Cr(ox)3]3- with three strong-field oxalate ligands will have the largest d orbital splitting, resulting in the absorption of the shortest wavelength light.
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