Recovery of PET-quenched fluorescent conjugated polymers with aza-15-crown-5 as pendant groups on interaction with ions

Novel conjugated polymers with aza-15-crown-5 as pendant groups, P1 were synthesized by the Sonogashira coupling reaction. The polymer P1 was found to show fluorescence enhancement response towards Ba 2+ . The gradual recovery and turning-point of emission intensity of polymers appeared in the addition of Ba 2+ , which provided good evidence for the fluorescence amplification mechanism of conjugated polymers.