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An Electrochemical Study of Cucurbit[6]uril–Cadmium(II) Interactions and the Effect of Electrolyte Cations and Guest Molecules

This work investigates the interaction between cadmium(II) and cucurbit[6]uril. When the effect of the scan rate on the cadmium(II)/cucurbit[6]uril complex was investigated, it was concluded that the conditions used were not suitable for calculating cadmium(II)/cucurbit[6]uril stoichiometries as the results were influenced by the adsorption of cucurbit[6]uril on the working electrode. Electrospray ionization mass spectrometry was used to verify the cadmium(II)/cucurbit[6]uril interaction. Competitive experiments with cations fromthe electrolyte and guests, such as acetic acid, isobutylammonium, and 1,5-pentanediammonium, were performed. The results showed that the larger the Group I element cation used in the supporting electrolyte, the higher the interference produced. Acetic acid and 1,5-pentanediammonium guests impeded the cadmium(II)/cucurbit[6]uril interaction, whereas isobutylammonium partially impeded this interaction, suggesting that cucurbit[6]uril bound two acetic acid molecules due to its short alkyl chain.