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.
By employing an amide-containing multicarboxylate ligand of N,N’’-(3,5-dicarboxylphenyl)benzene-1,4-dicarboxamide (H4L), a 3D (3,4,4,6)-connected Co(II) coordination polymer, namely, [Co(L)0.5(tytb)]n (LCU-112, LCU = Liaocheng University, tytb = 1,3,5-tris(1,2,4-triazol-1-ylmethyl)-2,4,6-Trimethylbenzene) has been constructed through solvothermal...
It is necessary to find more simple
methods to improve the detection
selectivity and sensitivity of antibiotics. Herein, we constructed
a novel three-dimensional (3D) Cd-MOF LCU-117 assembled
from p-terphenyl-4,2″,5″,4′-tetracarboxylic
acid, which showed a special 3D helical structure with carboxylic
acid ligands and nitrogen-containing ligands crossing each other vertically.
Luminescence measurements indicated that LCU-117 has
high selectivity and sensitivity toward Eu3+ through the
ratiometric effect. Meanwhile, this complex itself could detect antibiotics
oxytetracycline (OTC) through the turn-off mechanism. When Eu3+ was added in suspensions of LCU-117 (noted
as Eu3+@LCU-117), the detection toward OTC
was enhanced significantly and visually. The sensing mechanism was
investigated in detail by various measurements and theoretical calculations. LCU-117 has a good effect on the logic gate, potential fingerprint
detection, and mixed-matrix membranes (MMMs). The practical application
for monitoring OTC in water samples also provided a satisfactory result.
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