A multi-responsive luminescent sensor based on a Cd(II) coordination polymer with turn-on sensing toward Al3+ and Cr3+ as well as ratiometric response to norfloxacin

Luminescent coordination polymers (CPs) can be as promising sensors in which an analyte-induced multi-responsive system with classy recyclability is conducive to the detection of plentiful deadly contaminants. A ternary Cd(II) CP, namely, [Cd(L)(0.5)(1,8-NDC)middotH(2)O](n) (1) (1,8-H2NDC = 1,8-naphthalenedicarboxylic acid) was constructed from the new flexibility 1,5-bis(thiabendazol-1-yl)pentane (L) and 1,8-H2NDC ligands under hydrothermal conditions. 1 possesses a 1D chain structure. 1 displays excellent pH resistance and luminescent sensing properties. 1 represents the first-ever CP for significant fluorescence turn-on detection of Al3+ and Cr3+ ions as well as ratiometric response to norfloxacin (NOR), even with the coexistence of other interferents. The luminescent sensing mechanism of 1 toward different analytes was discussed in detail.

Automated summary

Luminescent coordination polymers have promising applications as sensors for detecting deadly contaminants. The Cd(II) CP constructed in this study demonstrates excellent pH resistance and luminescent sensing properties for the detection of Al3+, Cr3+, and norfloxacin.