A CdII‐Based Metal‐Organic Framework with pcu Topology as Turn‐On Fluorescent Sensor for Al3

A new metal‐organic framework (MOF) {[Cd2(bbib)2(ndc)2]⋅2DMF}n (JXUST‐1) (bbib=1,3‐bis(benzimidazolyl)benzene, H2ndc=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+. Knowing it Al: A CdII‐based metal‐organic framework that displays high sensitivity and selectivity toward Al3+ detection is reported, with a low detection limit of 0.048 ppm. Due to its good thermal and chemical stabilities as well as recycling property, it holds great potential for application in recognizing Al3+ by turn‐on effect.