A Double-Walled Bimetal–Organic Framework for Antibiotics Sensing and Size-Selective Catalysis

Abstract

The first double-walled bimetal-organic framework [Cd₄K₄(TADA)₄(H₂O)₁₂]·6DMF (1, TADA = 3,3'-((6-hydroxy-1,3,5-triazine-2,4-diyl)bis(azanediyl)) dibenzoate) has been successfully constructed. In virtue of its high porosity and abundant basic sites, MOF 1 can be served as a high-efficiently size-selective heterogeneous catalyst for Knovenagel condensation reaction. Remarkably, 1 also exhibits excellent luminescent detectability for metronidazole (MDZ) with the highest quenching constant ( K_sv) of 1.16 × 10⁵ M^-1. The results demonstrate that 1 can be served as a unique bifunctional platform for antibiotics sensing and size-selective catalysis.