Stable Zinc(II) Coordination Polymer as a Rapid and Highly Sensitive Fluorescence Sensor for the Discriminative Sensing of Biomarker 2-(2-Methoxyethoxy) Acetic Acid

Abstract

A novel two-dimensional bilayer Zn-based luminescent coordination polymer (LCP) [Zn2(μ2-OH)­(4-dptp)­(3,4′,5-bpt)] (LCP 1) [4-dptp = N 3,N 4-bis­(pyridin-4-ylmethyl)­thiophene-3,4-dicarboxamide and 3,4′,5-H3bpt = biphenyl-3,4′,5-tricarboxylic acid] was successfully prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction, IR spectroscopy, powder X-ray diffraction, and luminescence spectroscopy. LCP 1 displayed excellent fluorescence-quenching efficiency toward a biomarker 2-(2-methoxyethoxy) acetic acid (MEAA) with a high K sv (5.153 × 104 M–1), a low limit of detection (0.244 μM), and a rapid response time (28 s). Additionally, LCP 1 can repeatedly detect MEAA at least eight times with excellent stability. The sensing mechanism was also carefully investigated through UV–vis absorption spectroscopy, density functional theory calculations, and fluorescence lifetime analysis.

Two Stable Cd-MOFs as Dual-Functional Materials with Luminescent Sensing of Antibiotics and Proton Conduction

“…In addition, the absorption spectrum of CAP also shows an apparent overlap with the absorption bands of 1 and 2 (Figure 6), indicating the occurrence of the competitive absorption of the irradiated light between MOFs and CAP. 51,53 The irradiated light of 1 and 2 can be partly absorbed by CAP, further resulting in luminescent quenching. In summary, the quenching process is due to the synergistic effects of PET, IFE, competitive absorption, and weak interactions.…”

“…3,18,25,32,49,50 It has been verified that nitrogen-containing auxiliary second ligands can not only increase the diversity of MOFs architectures but also improve the stability of the skeleton of the resulting MOFs. 14,32,39,51 Meanwhile, the introduction of uncoordinated nitrogen proton donors can also increase the number of active sites and the concentration of proton carriers, endowing MOFs with excellent luminescent sensing and desirable proton conduction abilities. 18,19,36 However, the relevant reports about transitionmetal MOFs with such dual functionalities are still few and remain challenging.…”

“…Thus, the nitrogen-containing basic ligands (e.g., imidazole, 2,2′-biimidazole, 2,2′-bipyridine, etc.) are broadly used for the construction of transition-metal MOFs. ,,,,, It has been verified that nitrogen-containing auxiliary second ligands can not only increase the diversity of MOFs architectures but also improve the stability of the skeleton of the resulting MOFs. ,,, Meanwhile, the introduction of uncoordinated nitrogen proton donors can also increase the number of active sites and the concentration of proton carriers, endowing MOFs with excellent luminescent sensing and desirable proton conduction abilities. ,, However, the relevant reports about transition-metal MOFs with such dual functionalities are still few and remain challenging. ,, Therefore, designing transition-metal MOFs showing outstanding proton conductivity and luminescent sensing of CAP is urgently needed.…”

Methyl blue@CUST-580 composite as a simultaneous fluorescence-enhanced dual-emission platform for the enhanced detection of antibiotics

“…The quenching efficiency can be obtained by (I 0 − I)/I 0 × 100%, where I 0 is the fluorescence intensity of the blank sample, and I is the fluorescence intensity after the addition of antibiotics. 24 From the Stern-Volmer (SV) equation I 0 /I = K sv [M] + 1, 25,26 [M] is the concentration of NFT and K sv is the fluorescence burst constant (M −1 ). 27 As shown in Fig.…”

Detection of salbutamol and enantioselective sensing ofl/d-lysine based on a cadmium-based coordination polymer

“…Organic chromophores of ligands and fluorescent metal ion clusters can both be employed as emission centers that can be further functionalized to enhance their emitting capabilities. 17,18 In the discrimination of metal ions, [19][20][21][22][23] biomarkers, [24][25][26] pH, 27,28 temperature, 29,30 and other species, many CPs with fluorescence characteristics have been developed and utilized in biological sciences and environmental monitoring. It is widely known that the Cd 2+ ion is a toxic metal ion harmful to human health.…”