A water-stable three-dimensional (3D) metal-organic framework (MOF) of {[Tb(Cmdcp)(HO)](NO)·5HO} (1, HCmdcpBr = N-carboxymethyl-(3,5-dicarboxyl)pyridinium bromide) has been synthesized and characterized. MOF 1 is highly emissive, giving rise to green luminescence that can be quenched by Fe due to the partial overlap of its excitation spectrum with the absorption spectrum of Fe. The subsequent introduction of ascorbic acid (AA) leads to the reduction of Fe into Fe, accompanied by the near-entire recovery of MOF 1 emission. The density functional theory (DFT) calculation results support the proposed mechanism. Such a sensing cycle is further transferable to urine and serum samples with a satisfactory near-quantitative recovery, highlighting its good potential in biologically relevant applications.
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