A simple commercially available probe 8-hydroxyjulolidine-9-aldehyde (HJ) has been developed as a turn-on fluorescent probe specifically for Al and characterized systemically. The probe HJ for Al ion exhibits strong green fluorescence under ultraviolet light. The HJ acted as an OFF-ON-OFF type fluorescent probe for Al and ATP in nearly 100% aqueous media. The 1:1 binding stoichiometry between probe and Al has been established from Job's plot and HRMS studies. The limit of detection for Al ion is found to be 5.75 × 10 M. The large association constant between HJ and Al ion is 1.05 × 10 M. Detailed insights of probe-metal interaction mechanisms have been studied by the density functional theory (DFT) as well as the time dependent-DFT (TDDFT) calculations. Moreover, benefiting from the water solubility and biocompatibility of the probe HJ and its HJ-Al complex, they have also been successfully applied to detect Al and ATP by bioimaging in onion epidermal cells and adult zebrafish respectively.
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