Dual-response fluorescence sensing of H₂PO₄^- and CO₃^2- using AJP filter paper based on a pH-stable Cd^II-based...

A new Cd^II-based luminescent metal-organic framework (LMOF) with the formula {[Cd(BIBT)(NDC)]·solvents} (JXUST-32, BIBT = 4,7-bi(1H-imidazol-1-yl)benzo-[2,1,3]thiadiazole and H₂NDC = 2,6-naphthalenedicarboxylic acid) was successfully synthesized by a solvothermal method. JXUST-32 shows a two-dimensional (4,4)-connected network and exhibits significant fluorescence red shift and slight enhancement for H₂PO₄^- and CO₃^2- sensing with detection limits of 0.11 and 0.12 μM, respectively. In addition, JXUST-32 has good thermal stability, chemical stability and recyclability. Significantly, JXUST-32 represents a fluorescence red-shift dual response MOF sensor for H₂PO₄^- and CO₃^2- detection and the analytes can be identified by the naked eye, aerosol jet printing filter paper, light-emitting diode beads and luminescent films.