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Explain below why the absorption spectra of many six-coordinate copper(II) complexes contain an asymmetric band, often...

Explain below why the absorption spectra of many six-coordinate copper(II) complexes contain an asymmetric band, often with pronounced shoulders, or even separate bands.

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This is due to the Jahn-Teller distortion.

(i) Due to Jahn-Teller distortion, copper(II) complexes exhibit a z-in system, where the ligand along the z-axis of the metal d-orbitals undergo contraction when compared to the ligand in the XY-plane.

(ii) Due to Jahn-Teller distortion, copper(II) complexes also exhibit a z-out system, where the ligand along the z-axis of the metal d-orbitals undergo elongation when compared to the ligand in the XY-plane.

As a result, the absorption spectra of many six-coordinate copper(II) complexes contain an asymmetric band, often with pronounced shoulders, or even separate bands.

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