during my last lab course I synthesized cis
]. Now I need to analyze it's uv-vis spectrum.
I was asked to assign electronic transitions to the absorption bands but since I haven't had my uv-vis lecture yet, I have trouble doing so. The spectrum is attached.
The bands are at 306 nm (ε = 357 L/mol*cm) and 360 nm (ε = 503 L/mol*cm) with CHCl3
I know that the d-configuration is low spin d6
and that three of the DMSO molecules bond via S (π-acceptor) and one via O (δ-donor), the Cl ligands are π-donors. So I think CT's in the form of π
d and vice versa should be possible. I have read, though, that CT transitions have values of ε >1000.
d transitions could occur as well but the example I have seen had lower ε values (below 200), so I am not sure whether they would be visible here.
A third option would be n
These are my thoughts, but I'm still not sure which transition fits which band since my ε values don't seem to fit except maybe for n
Help would be much appreciated.