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A novel fluorescent probe was synthesized and explored to detect cadmium ions (Cd2+) based on an imine functionalized metal–organic framework (MOF). The nanoscale MOF probe (∼100 nm) displayed a turn-on fluorescence in aqueous environments with the addition of Cd2+ which could be ascribed to the interaction between the CN group and specific metal ions, presenting a low-toxicity, highly selective and sensitive detection method for Cd2+ with a detection limit of 0.336 μM (37.8 ppb) and a broad linear range of 0–500 μM, which is promising for application in intracellular sensing and imaging of Cd2+. The probing mechanism was studied and discussed in detail.

A turn-on fluorescent probe for Cd2+ detection in aqueous environments based on an imine functionalized nanoscale metal–organic framework

A turn-on fluorescent probe for Cd²⁺ detection in aqueous environments based on an imine functionalized nanoscale metal–organic framework