Two Multiresponsive Luminescent Zn-MOFs for the Detection ofDifferent Chemicals in Simulated Urine and Antibiotics/Cations/Anions in Aqueous Media

Two Zn-MOFs, namely, {[Zn(L)0.5(bpea)]middot0.5H2Omiddot0.5DMF}n[LCU-113(for Liaocheng University)] and {[Zn-(L)0.5(ibpt)]middotH2OmiddotDMF}n(LCU-114), were synthesized based onflexibletetracarboxylic acid 1,3-bis(3,5-dicarboxyphenoxy)benzene (H4L) anddifferent N-ligands [bpea = 1,2-dipyridyl ethane; ibpt = 3-(4 '-imidazolobenzene)-5-(pyridine-4 '-yl)-1,2,4-triazole].LCU-113andLCU-114possess twofold interpenetrating three-dimensional pillared layerstructures, in which a two-dimensional layer formed by carboxylic acid andZn2+ions was pillared by bpea and ibpt, respectively. The two complexesshow high water stability and high luminescence sensing performancetoward organic solvents, ions, and antibiotics, as well as chemicals, insimulated urine. The investigation showed that (1)LCU-113andLCU-114could detect uric acid (UA, 2,6,8-trihydroxypurine, metabolite ofpurine) andp-aminophenol (PAP, biomarker of phenamine) in simulatedurine by luminescence quenching, respectively, and (2) luminescence quenching ofLCU-113andLCU-114occurred in aqueoussolutions of nitrofurazone (NZF), Fe3+, and CrO42-/Cr2O72-. All the above detections have excellent anti-interference ability andrecyclability. The luminescence mechanism analysis indicates that weak interactions between the framework structures and the targetanalytes as well as the energy competition (innerfilter effect) play an important role in sensing the above analytes. The practicalapplication for monitoring NZF/Fe3+in water samples was also tested

Automated summary

Two Zn-MOFs with high water stability and luminescence sensing performance were synthesized and found to be able to detect organic solvents, ions, antibiotics, and chemicals in simulated urine with excellent anti-interference ability and recyclability.