Hexaphyrin derivatives for anion recognition in organic and aqueous media†
Hexaphyrin-based anion chemosensors are reported for the first time. The meso-hexakis(ethylenediamine)-substituted hexaphyrins 2 and 3 revealed strong affinity for F−, AcO− and H2PO4−. Adsorption constants in aqueous media were determined on a gold piezoelectric crystal coated with 2 and 3. 1H NMR titrations and molecular dynamics simulations showed the main interactions between hosts and guests.