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What coordination complexes have peaks with short wavelengths with examples
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Coordination complexes with strong-field ligands like CN-, CO, and NO2- tend to have peaks with short wavelengths due to larger crystal field splitting (Δo). This means the energy gap between the d orbitals is higher, leading to higher energy transitions and shorter wavelength absorption. For example, [Fe(CN)6]3- absorbs in the UV region (short wavelength), while [Fe(H2O)6]3+ absorbs in the visible region (longer wavelength). This difference is because CN- is a strong-field ligand while H2O is a weak-field ligand.
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