Thiourea-Based Receptors for Anion Recognition and Signaling.

This work reports on two thiourea-based receptors with pyridine and amine units including 1-naphthyl () and 4-nytrophenyl () as signaling units. For both compounds, their affinity and signaling ability toward various anions of different geometry and basicity in DMSO were studied using UV-vis, fluorescence, and H NMR techniques. Anion recognition studies revealed that both and have, in general, high affinities toward basic anions.