A Cd^II‐Based Metal‐Organic Framework with <i>pcu</i> Topology as Turn‐On Fluorescent Sensor for Al³⁺

Abstract

A new metal-organic framework (MOF) {[Cd₂ (bbib)₂ (ndc)₂ ]⋅2DMF}_n (JXUST-1) (bbib=1,3-bis(benzimidazolyl)benzene, H₂ ndc=1,4-naphthalenedicarboxylic acid, DMF=N,N-dimethylformamide) has been solvothermally synthesized and characterized by single-crystal X-ray diffraction, PXRD, TGA, IR and elemental analysis. JXUST-1 exhibits a three-dimensional 6-connected pcu topology with a Schläfli symbol {4¹² .6³ } constructed by [Cd₂ (CO₂ )₃ ] secondary building units. Fluorescence studies show that this MOF can sensitively and selectively recognize Al³⁺ via a fluorescence enhancement effect, and the detection limit is 0.048 ppm. Furthermore, JXUST-1 displays relatively good thermal and chemical stabilities as well as reusability. All these results suggest JXUST-1 to be a highly selective and recyclable luminescent sensing material for the detection of Al³⁺ .