Abstract

The di-thioureas (1) and mono-thioureas (3) based on 1,1-binaphthyl-2,2-diol exhibited a preference for Cl- with a 1:1 stoichiometry. The cooperativity of the two binding sites (two thiourea groups for 1, thiourea and hydroxyl groups for 3) for anion binding was established by comparing the binding of the mono-thiourea receptors (2) based on naphthyl.

Keywords: Anion receptor, p-nitrophenyl thiourea, 1,1'-binaphthyl-2, 2'-diol, chloride anion selectivity