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

Abstract

Two Zn-MOFs, namely, {[Zn(L) 0.5 (bpea)]•0.5H 2 O• 0.5DMF} n [LCU-113 (for Liaocheng University)] and {[Zn-(L) 0.5 (ibpt)]•H 2 O•DMF} n (LCU-114), were synthesized based on flexible tetracarboxylic acid 1,3-bis(3,5-dicarboxyphenoxy)benzene (H 4 L) and different N-ligands [bpea = 1,2-dipyridyl ethane; ibpt = 3-(4′imidazolobenzene)-5-(pyridine-4′-yl)-1,2,4-triazole].LCU-113 and LCU-114 possess twofold interpenetrating three-dimensional pillared layer structures, in which a two-dimensional layer formed by carboxylic acid and Zn 2+ ions was pillared by bpea and ibpt, respectively. The two complexes show high water stability and high luminescence sensing performance toward organic solvents, ions, and antibiotics, as well as chemicals, in simulated urine. The investigation showed that (1) LCU-113 and LCU-114 could detect uric acid (UA, 2,6,8-trihydroxypurine, metabolite of purine) and p-aminophenol (PAP, biomarker of phenamine) in simulated urine by luminescence quenching, respectively, and (2) luminescence quenching of LCU-113 and LCU-114 occurred in aqueous solutions of nitrofurazone (NZF), Fe 3+ , and CrO 4 2− /Cr 2 O 7 2− . All the above detections have excellent anti-interference ability and recyclability. The luminescence mechanism analysis indicates that weak interactions between the framework structures and the target analytes as well as the energy competition (inner filter effect) play an important role in sensing the above analytes. The practical application for monitoring NZF/Fe 3+ in water samples was also tested.

Selective and Sensitive Recognition of Specific Types of Toxic Organic Pollutants with a Chemically Stable Highly Luminescent Porous Organic Polymer (POP)

“…Since the discovery of penicillin, a well-known antibiotic used as an antimicrobial substance active against bacteria, it has been used widely as a medicine in hospitals for humans and also as veterinary medicine owing to its ability to inhibit the growth of various pathogens. , Apart from this, with the development of agricultural production, it is also used in agricultural fields for food production, aquaculture, beekeeping, etc. ,, However, the excessive use of antibiotics causes bacterial drug resistance and antibiotic resistance. In line with this, the abuse or misuse of such species also further results in severe environmental pollution. − On the other hand, pesticides, another class of potential organic contaminants, have become a “matter of concern” in recent times. Pesticides have been extensively used in modern agriculture to raise production. ,, Not only are pesticides extremely toxic in nature to agricultural pests, but also their residues in water bodies cause serious water pollution. , Prolonged exposure to these hazardous species causes serious problems to living organisms by affecting their nervous systems, respiratory systems, and reproductive systems .…”

A multi-responsive luminescent Co(ii) coordination polymer assembled from amide-functionalized organic units for effective pH and cation sensing

“…We have been engaged in constructing MOFs as luminescent sensors in recent years. 42–46 To extend the research of multifunctional crystal materials, in this work a 3D (3,4,4,6)-connected Co( ii ) complex was obtained based on an amide-functionalized ligand and flexible triazole ligand, namely, [Co(L) 0.5 (tttmb)(H 2 O)] n ( LCU-112 , LCU = Liaocheng University; H 4 L = N , N ′′-(3,5-dicarboxylphenyl)benzene-1,4-dicarboxamide; tttmb = 1,3,5-tris(1,2,4-triazol-1-ylmethyl)-2,4,6-trimethylbenzene). LCU-112 demonstrates excellent fluorescence and magnetic properties (Scheme 1).…”

“…40,41 We have been engaged in constructing MOFs as luminescent sensors in recent years. [42][43][44][45][46] To extend the research of multifunctional crystal materials, in this work a 3D (3,4,4,6) 5-tris(1,2,4-triazol-1-ylmethyl)-2,4,6-trimethylbenzene). LCU-112 demonstrates excellent fluorescence and magnetic properties (Scheme 1).…”

Series of TM-OFs as a Platform for Efficient Catalysis and Multifunctional Luminescence Sensing

“…The detection of toxic ions and organic pollutants is irreplaceably significant for the protection of the natural environment, plant and animal life, and human health. Luminescent MOFs (LMOFs) have been considered to be superior sensors for sensing applications due to their unique properties. − Transition-metal ions containing d orbitals of d 10 as the valence orbitals, such as Zn­(II) and Cd­(II), can induce the ligand–metal charge transfer (LMCT) process, making these metals a more common choice for building luminescent MOFs. , Cadmium salts are relatively inexpensive and abundant on Earth. Cd­(II) ions have been shown to form MOFs with diverse structures and topological types, making the Cd­(II) ion an excellent metal for building LMOFs.…”