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When given two copper(II) complexes - bis(N-3-chlorophenyl-salicydenaminato)copper(II) and bis(N-3-methylphenyl-salicydenaminato)copper(II) - how can you predict their EPR spectrum and hence their g average values based on their electronic properties? I am aware that bis(salicylaldiminato)copper(II) complexes have have a preference for square planar configuration, but is there any way to predict if the compound would assume a tetrahedral or square planar geometry based on its EPR spectrum?

bis(N-3-chlorophenyl-salicydenaminato) has an absorption peak in UV spectrum at 659 nm and bis(N-3-methylphenyl-salicydenaminato)copper(II) has it at 665 nm.

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Yes. You can use computational chemistry to predict the electronic structure of the different possible conformers and then use that to get a bunch of EPR parameters. Specifically, you can use ORCA and EasySpin to predict EPR spectra of your complexes and compare to an experimental spectrum. You'll also get a bunch of other useful information about your complex, especially their relative stabilites.

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