Cation-triggered ‘switching on’ of the red/near infra-red (NIR) fluorescence of rigid fluorophore–spacer–receptor ionophores
Abstract
Fluorophore–spacer–receptor ionophores 1 and 2 show a strong cation-induced enhancement of the fluorescence at λ > 650 nm in the presence of HgII and AgI (1) or PbII, alkaline-earth and alkali metal ions (2).