AIE-active fluorescent probes as ‘turn-off’ sensors for the selective detection of Cr⁶⁺ and Fe³⁺ ions

Two novel aggregation-induced emission (AIE) probes were synthesized <i>via</i> Suzuki coupling for the detection of toxic metal ions. Comprehensive characterization confirmed their structures and purity. Both compounds exhibited strong AIE behavior, providing a highly emissive platform in aqueous environments. These probes function as highly sensitive and selective 'turn-off' fluorescent sensors for Cr⁶⁺ and Fe³⁺ ions, respectively, <i>via</i> a distinct fluorescence quenching mechanism. Their robust response, even in the presence of competing ions, underscores their potential as reliable tools for environmental monitoring. This work highlights the utility of AIEgens as stable fluorescent platforms for designing efficient sensors for critical metal ions.