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

Abstract A new metal‐organic framework (MOF) {[Cd 2 (bbib) 2 (ndc) 2 ]⋅2DMF} n ( JXUST‐1 ) (bbib=1,3‐bis(benzimidazolyl)benzene, H 2 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 {4 12 .6 3 } constructed by [Cd 2 (CO 2 ) 3 ] secondary building units. Fluorescence studies show that this MOF can sensitively and selectively recognize Al 3+ 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 Al 3+ .