Title:

Spying on Metal Complexes: Spectral Features of Ion-Specific Binding Motifs

Ion binding behavior is not completely understood, despite its involvement in numerous biological processes. Research has been initiated using IR spectroscopy to explore the ion binding specificity in ethylene glycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid (EGTA), aiming to understand how biomolecules distinguish between ions. Spectroscopic shifts in carboxylate asymmetric stretching modes were observed that are highly sensitive to binding configuration. It was found that a blue shift occurs with a decrease in ionic radius. The results found for EGTA are consistent with prior results for EDTA. Future work will include experimentation with additional ions, as well as temperature-dependent spectroscopy to measure stability of the complexes with different ions.

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