Cyclophanes having two thiourea groups were synthesized and their anion binding ability was examined by titration method using 1H-NMR spectroscopy. Strong and selective anion binding of the preorganized cyclic receptors was observed in the general order of H2PO4− > CH3COO− > Cl− > HSO4− > Br−.
Cyclic thioureaderivatives having three different types of cyclophane structure, ortho-meta, meta-meta, and meta-para, and a lariat-type thiourea, were synthesized, and their anion-binding ability was examined. The association constants for the complexation between the receptors and several anions in DMSO-d(6) were measured by the titration method using (1)H NMR spectroscopy. All receptors, except