A fluorescent metal sensor based on macrocyclic chelationElectronic supplementary information (ESI) available: electrospray MS data and photographs of solutions of ligand 3c in the absence and presence of Cu2+. See http://www.rsc.org/suppdata/cc/b1/b100535i/

Abstract

The ethylenediamine functionalized quinacridone derivatives 3a–c display an orange fluorescence (λ_em(max) = 558 nm) which is quenched upon addition of coordinating metal ions by formation of a macrocyclic chelate bringing metal ion and fluorophore in close proximity to one another.