I am looking at a set of results showing a directly proportional relationship for an increasing maximum absorption wavelength (UV-Vis spectra) with increasing donor number of solvent ligands. The complex has a $\ce{Cu^2+}$ centre with $\mathrm{d^9}$ electronic configuration. Assuming a tetragonal configuration, how does this tie in with ligand strengths?

I am not sure what I can deduce here as I thought the more available a lone pair (basicity) would be able to interact more strongly, a higher wavelength indicates the energy gap between the $\mathrm d_{x^2-y^2},$ and $\mathrm d_{z^2}$ orbital has decreased. So, has there been more significant Jahn–Teller distortion, or is the splitting parameter somehow smaller?

Where does my reasoning fall down?


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