Abstract
The synthesis of amidourea-based colorimetric anion sensors 1 and 2 and the evaluation of these sensors using anions such as acetate ( CH 3 CO 2 - ) , fluoride (F −), hydrogen phosphate ( H 2 PO 4 - ) and hydrogenpyrophosphate ( pyr) in DMSO is described. While 1 has a single amidourea moiety, 2 has two such receptors incorporated into a lower-rim 1,3-disubstituted calix[4]arene scaffold. Whilst both sensors gave rise to red shifts in their absorption spectra upon anion recognition, the sensing of F − and pyr gave rise to large changes with concomitant colour changes from yellow to purple, which were visible to the naked eye.
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