Water-Stable Cd(II)-Based Metal–Organic Framework: Antibiotic Detection and Photochromism Behavior

Solvothermal reaction of cadmium nitrate with a polypyridine-containing ligand tetra(pyridine-4-yl)benzene-1,4-diamine (TBD) gives rise to a novel Cd(II)-organic framework with the 3D interpenetrated architecture [Cd(TBD) (NO3)2·DMA](1) (DMA = N,N-dimethylacetamide). The stability test is performed on compound 1, which shows that the Cd-MOF can be quite stable in water and even harsh conditions. A photoluminescence study has been investigated on 1. Remarkably, nitrofurantoin, as a kind of antibiotic, has a great quenching effect on the luminescent performance of the prepared hybrid, suggesting that compound 1 can be regarded as an effective chemical sensor to detect specific analytes. The anti-interference test, recyclability examination, and sensing mechanism have been further conducted. Moreover, in virtue of the electron transfer from oxygen of NO3– to nitrogen atoms of TBD, photochromism behavior can be easily realized in compound 1.