Fluorescent Zn-PDC/Tb³⁺ Coordination Polymer Nanostructure: A Candidate for Highly Selective Detections of Cefixime Antibiotic and Acetone in Aqueous System

Abstract

Tb-doped zinc-based coordination polymer nanospindle bundles (Zn-PDC/Tb, or [Zn(2,5-PDC)(HO)]·HO/Tb) were synthesized by a simple solution precipitation route at room temperature, employing Zn(NO), Tb(NO), and 2,5-NaPDC as the initial reactants, and a mixture of water and ethanol with the volume ratio of 10:10 as the solvent. The as-obtained nanostructures presented strong fluorescent emission under the excitation of 298 nm light, which was attributed to the characteristic emission of the Tb ion. It was found that the above-mentioned strong fluorescence of the nanostructures could be selectively quenched by cefixime (CFX) in aqueous solution. The other common antibiotics hardly interfered. Thus, as-obtained Zn-PDC/Tb nanostructures could be prepared as a highly sensitive fluorescence probe for selective detection of CFX in an aqueous system. The corresponding detection limit reached 72 ppb. The theoretic calculation and UV-vis absorption experiments confirmed that the fluorescence quenching of Zn-PDC/Tb nanostructures toward CFX should be attributed to the electron transfer and the fluorescence inner filter effect between the fluorescent matter and the analyte. In addition, the strong fluorescence of the nanostructures could also be selectively quenched by acetone in the water system.

Cascade Chromogenic System with Exponential Signal Amplification for Visual Colorimetric Detection of Acetone

“…The limit of detection (LOD) is calculated to be 35 μM based on 3σ/ k , where σ and k are the standard deviation of the absorbance without acetone and slope of the linear calibration curve, respectively. This LOD is 2–3 orders of magnitude lower than that of the reported fluorescence assays. − The high sensitivity of this colorimetric assay is ascribed to the fact that the production of ·OH with high reaction activity is obviously restrained when the 1:1 DAP·acetone complex is generated (Figure S11). More fascinatingly, the presence of acetone at a concentration of 1 mM can be observed with the naked eye due to the distinct color fading (the inset of Figure c).…”

A Water‐Stable Uranyl Organic Framework as a Highly Selective and Sensitive Bifunctional Luminescent Probe for Fe3+ and Tetracycline Hydrochloride

“…And the lower the LUMO orbital level of antibiotics, the easier the electron transfer was, and the more pronounced the fluorescence quenching effect . Therefore, the reduction potential of antibiotics was determined by electrochemical cyclic voltammetry (Figure S12–S18) and used the formula LUMO=−(4.4+ E red onset + E Fc/Fc +) to obtain the LUMO orbital energy level . The test results exhibit that the order of antibiotic LUMO orbital level was TCH<PC≈AZ≈ACT<SDZ<CF (Figure and Table S3), and the LUMO orbital level of tetracycline hydrochloride was significantly lower than other antibiotics.…”

“…[40][41][42] Therefore, the reduction potentialofa ntibiotics was determined by electrochemical cyclic voltammetry (Figure S12-S18)a nd used the formula LUMO = À(4.4 + E red onset + E Fc/Fc +)t oo btain the LUMO orbital energyl evel. [43,44] The test results exhibit that the order of antibiotic LUMO orbital level wasT CH < PC % AZ % ACT < SDZ < CF ( Figure 10 and Ta ble S3), and the LUMO orbital level of tetracycline hydrochloride was significantly lower than other antibiotics. Therefore, the best quenching effect was tetracycline hy- www.chemasianj.org drochloride, which was consistentw ith experimental phenomenon.…”

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

“…The LUMO energy of TC was lower than that of 1 , so electrons were transferred from the conduction band of 1 to the LUMO of TC upon excitation, thereby causing fluorescence quenching. [ 38 ] However, CHL, whose LUMO energy was also similar to that of TC, did not cause the fluorescence quenching of 1 . The order of LUMO energy and the quenching efficiency of several other antibiotics cannot be corresponding to each other.…”