Highly Selective and Stable Zn (II)‐Based Metal–Organic Frameworks for the Detections of Tetracycline Antibiotic and Acetone in Aqueous System

Abstract

Tetracycline (TC) is one of the most widely used antibiotics in aquaculture, and its good water solubility makes it a major contaminant in seawater. Therefore, it is very necessary and challenging to develop an efficient detection method. In this work, two novel metal–organic frameworks [Zn (bpydb)(bimmb)0.5]n (1), {[Zn2(bpydb)2(bimb)]·[Zn (bpydb)(bimb)]·H2O}n (2), (bimb = 1,4‐bis (lmidazol) butane, H2bypdb = 4,4′‐(4,4’‐Bipyridine‐2,6‐diyl)dibenzoic acid, bimmb = 1,4‐bis (imidazol‐1‐ylmethyl)benzene) were successfully synthesized under solvothermal conditions. Zn‐MOF 1–2 were characterized by X‐ray powder diffraction (PXRD), Fourier transform infrared (FT‐IR) spectroscopy and thermogravimetric analysis (TGA). As expected, 1–2 have excellent fluorescence properties, thermal stability and good structural stability in water. TC in water can be detected by fluorescence quenching with high selectivity. At the same time, the fluorescence quenching efficiency remains unchanged in the presence of other interfering antibiotics and in aqueous solutions of different pH values (pH = 3–10). The detection ability of 1 in real seawater has not changed substantially, showing considerable practical application prospects. Interestingly, 1–2 also efficiently detected traces of acetone in solution with detection limits of 0.07 μM (4.38 ppb) and 0.18 μM (10.85 ppb), respectively. In addition, the mechanism of fluorescence quenching is further discussed.

Stable Eu3+/Cu2+-Functionalized Supramolecular Zinc(II) Complexes as Fluorescent Probes for Turn-On and Ratiometric Detection of Hydrogen Sulfide

“…It is necessary to point out that there are limited Zn-based coordination polymers (CPs), MOFs, or complexes featuring good stability in boiling water, HEPES buffer solution, and in aqueous solutions with a pH range of 2–10. Generally, most Zn-based CPs or MOFs with Zn 4 O units are subject to hydrolysis under high humidity conditions and cannot exist in various acid–base solutions. , The excellent chemical stability of Znpda can be attributed to the unique structure, where the Zn–N­(phen) bonding interaction is stronger than Zn–O and such N/O-coordinated Zn 2+ polyhedra are much more stable than the common Zn 4 O modes. , In addition, the multiple hydrogen bonds and π–π stacking interactions of Znpda have also contributed to its structural stability.…”

“…37,38 The excellent chemical stability of Znpda can be attributed to the unique structure, where the Zn− N(phen) bonding interaction is stronger than Zn−O and such N/O-coordinated Zn 2+ polyhedra are much more stable than the common Zn 4 O modes. 39,40 In addition, the multiple hydrogen bonds and π−π stacking interactions of Znpda have also contributed to its structural stability.…”

Synthesis and characterization of MOFs constructed from 5-(benzimidazole-1-yl)isophthalic acid and highly selective fluorescence detection of Fe(iii) and Cr(vi) in water

“…where, I 0 is the uorescence intensity of complex in water, I is the uorescence intensity of complex in the solution with a certain concentration of ion, [M] is ion concentration, K sv is quenching constant). 43 It can be calculated that in the low concentration range of 0-40 mM, there is a good linear relationship between the uorescence intensity of 1 and the concentration of Fe 3+ (R 2 ¼ 0.9945), and the quenching constants K sv are 2.21 Â 10 4 M À1 . K sv is comparable to other uorescent MOFs of the same type used to detect Fe 3+ , which makes complex 1 a competitive candidate (Table S2 †).…”

High‐efficiency fluorescent probe constructed by Cd(II) complex for detecting nitro compounds and antibiotics

“…[12] Long-term exposure to the environment usually causes pollution of surface water, groundwater, and drinking water. [13][14][15][16][17][18][19][20][21] The frequent use of antibiotics leads to their continuous input in the environment. Although many countries set strict tolerance levels for these antibiotics and perform surveillance programs, antibiotic pollution is particularly serious.…”