Naphthalene strapped fluorescent calix[4]pyrrole isomers: Halide ion selectivity based on strap topography

Abstract

Two novel isomeric strapped calix[4]pyrroles were synthesized using diether straps derived from naphthalene as the fluorescent reporting unit for the first time. The receptor derived from 2,3-dihydroxynaphthalene displays highest sensitivity towards Cl- ion, whereas that derived from 2,7-analogue shows peak sensitivity for F- ion.© 2012 The Royal Society of Chemistry.