Recognition and sensing properties of a quinazolinylaminothiourea-based anion receptor in non-aqueous and aqueous CH3CN–DMSO medium
Abstract Quinazolinylaminothiourea 1 selectively recognized AcO − , F − and H 2 PO 4 − over other anions in CH 3 CN–DMSO (99:1, v/v), which was accompanied with a visible color change from colorless to yellow. Interestingly, the selectivity of receptor 1 for AcO − over F − and H 2 PO 4 − could be obviously improved in aqueous CH 3 CN–DMSO medium. UV–vis and 1 H NMR titration experiments showed that intermolecular hydrogen-bonding interactions between receptor 1 and guest anions were responsible for the observed recognition behaviors.