I am working with Cu(II) complexes of certain aldaric acids and neutral amine auxiliary ligands. I would like to know the quickest way to do the initial investigation of the structure (apart from XRD) to see if coordination took place and if my ligand has decomposed or not. Also, how can one purify these complexes, apart from crystalization (as I am having some difficulties with certain structures). Thank you.
Hi Korban,
You can try NMR, but it will be paramagnetic. You might be able to see free ligand though.
UV-Vis will be fairly indicative of binding, and you can take UV-Vis at various Cu:L ratios to see how many ligands bind (Search for "Job plot").
As for overall structure, crystallization is the way to go. What troubles are you having with crystallization? What solvents have you tried?
Dr. Grice
https://www.sciencedirect.com/referencework/9780080437484/comprehensive-coordin
If you want to probe for the complex species in solution (no decomposing titration procedures) you can try:
EPR spectroscopy
HR-MS
Cyclic voltammetry
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