Fluorescent recognition of Hg2+ by a 1,1′-binaphthyl-based macrocycle: a highly selective off–on–off response†
Abstract
A 1,1′-bi-2-naphthol-based macrocyclic compound was found to show large fluorescent enhancement at a greatly red-shifted wavelength in the presence of one equiv. Hg2+ but not with any other metal ions. This change was visually observable from blue-greenish emission to bright yellow emission. The fluorescence was quenched when more than 2.6 equiv. Hg2+ was added.