Synthesis, Structure and Fluorescent Probes for Sensitive Detection for Nitrobenzene of a Cd-MOF

A Cd(II)-based metal–organic framework (Cd-MOF), named [Cd2(taptp)(bbibpy)(H2O)·2H2O·DMF]n, was successfully constructed under the condition of solvothermal (H2taptp = 2-(4-(tetrazol-5-yl)phenoxy)terephthalic acid, bbibpy = 5,5′-bis(benzimidazol-2-yl)-2,2′-bipyridine, DMF = N,N′-dimethylformamide). Cd-MOF was characterized by X-ray single-crystal diffraction, elemental analysis and thermogravimetric (TG) analysis. X-ray single crystal diffraction analysis reveals that Cd-MOF has a two-dimensional (2D) framework structure and crystallizes in the monoclinic system, space group P21/c. The fluorescence quenching experimental results show that Cd-MOF is potential fluorescent material that can selectively and sensitively fluorescent sensing Nitrobenzene. The fluorescence quenching of Cd-MOF belongs to dynamic quenching based on the Stern–Volmer model. The concentration-fluorescence experimental result shows that the detection limit of Cd-MOF for NB is 7.16 × 10–8 M, based on 3σ/Ksv.Graphical AbstractA Cd-MOF has been successfully synthesized and characterized. The fluorescence quenching experiments results showed Cd-MOF exhibits sensitive response to NB with detection limit of 7.16 × 10–8 M.