Tetrakis(methylimidazole) and tetrakis(methylimidazolium) calix[4]arenes: competitive anion binding and deprotonation |
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Authors: | Bullough Emma K Kilner Colin A Little Marc A Willans Charlotte E |
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Affiliation: | School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK. |
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Abstract: | Neutral tetrakis(methylimidazole) (1) and the novel cationic tetrakis(methylimidazolium) (2) calixarenes have been prepared and their solid-state and solution behaviour examined. The neutral imidazole forms a mono-zwitterion at elevated temperature, a feature that has been observed both in solution and in the solid-state. The cationic imidazolium exhibits a range of hydrogen bond interactions with anions, with the titration curves upon binding to basic anions suggesting sequential binding to both the upper and lower rims. |
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