A Europium-based MOF Fluorescent Probe for Efficiently Detecting Malachite Green and Uric Acid

Inorganic Chemistry, Journal Year: 2020, Volume and Issue: 59(10), P. 7181 - 7187

Published: April 30, 2020

Lanthanide (such as Tb and Eu) metal-organic frameworks (MOFs) have been widely used in fluorescent probes because of their multiple coordination modes brilliant fluorescence characteristic. Many lanthanide MOFs were applied detecting metal ions, inorganic anions, small molecules. However, it's rarely reported that Ln-MOF was devoted to malachite green (MG) uric acid (UA). We prepared a europium-based framework (Eu-TDA) (TDA = 2,5-thiophenedicarboxylic group). Luminescence studies demonstrated Eu-TDA can rapidly detect MG UA with excellent selectivity sensitivity, where individual quenching efficiency Ksv (MG: 5.8 × 105 M-1; UA: 4.15 104 M-1) detection limit 0.0221 μM; 0.689 μM) regarded the MOF sensors for UA. The Eu-TDA's emission by likely due spectral overlap, energy transfer, competition. Among 11 cations 14 quickly effectively recognize highly selective sensitive properties. Our method possesses potential application human blood fishpond.

Language: Английский

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Water-Robust Zinc–Organic Framework with Mixed Nodes and Its Handy Mixed-Matrix Membrane for Highly Effective Luminescent Detection of Fe³⁺, CrO₄^2–, and Cr₂O₇^2– in Aqueous Solution

Inorganic Chemistry, Journal Year: 2021, Volume and Issue: 60(3), P. 1716 - 1725

Published: Jan. 20, 2021

Metal–organic frameworks (MOFs) and MOF-based composites as luminescent sensors with excellent economic practicability handy operability have attracted much attention. Herein, we designed fabricated a porous Zn-based MOF, [Zn(OBA)2(L1)·2DMA]n [1; H2OBA = 4,4′-oxybis(benzoic acid), L1 2,4,6-tris(4-pyridyl)pyridine, DMA N,N-dimethylacetamide], mixed nodes under solvothermal conditions, the pore size of 5.9 Å was calculated from N2 adsorption isotherms by using density functional theory model. The as-synthesized compound 1 is stable in different boiling organic solvents water solutions wide pH range 2–12 exhibits intense luminescence emission at 360 nm excitation 290 nm. Significantly, shows high selective detection Fe3+, CrO42–, Cr2O72– aqueous solution even interference other ions. Compound can quickly sense these ions short time has striking sensitivity toward Fe3+ an ultralow limit (LOD) 1.06 μM. relatively low LODs for CrO42– are 3.87 2.37 μM, respectively, compared to reported works. Meanwhile, be reused detect six times simple regeneration. Considering practicability, mixed-matrix membrane (MMM) incorporated poly(methyl methacrylate) been constructed. This MMM displays quick prompt regeneration lifting analyte. useful comparable LOD below 4.35 μM work presents cost-effective MOF platform but sensing solution.

Language: Английский

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Metal–organic frameworks containing uncoordinated nitrogen: Preparation, modification, and application in adsorption

Materials Today, Journal Year: 2021, Volume and Issue: 51, P. 566 - 585

Published: Aug. 8, 2021

Language: Английский

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Four dual-functional luminescent Zn(ii)-MOFs based on 1,2,4,5-benzenetetracarboxylic acid with pyridylbenzimidazole ligands for detection of iron(iii) ions and acetylacetone

CrystEngComm, Journal Year: 2021, Volume and Issue: 23(7), P. 1604 - 1615

Published: Jan. 1, 2021

Four Zn-MOFs with different topological types were synthesized and characterized, MOFs 1–4 have excellent sensitivity, selectivity, recyclability structural stabilities for detecting acac/Fe³⁺ in the naked eye range.

Language: Английский

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pH-Stable Luminescent Metal–Organic Frameworks for the Selective Detection of Aqueous-Phase Fe^III and Cr^VI Ions

Inorganic Chemistry, Journal Year: 2022, Volume and Issue: 61(31), P. 12396 - 12405

Published: July 27, 2022

The development of chemically stable metal-organic framework (MOF)-based luminescent platforms for toxic ion detection in an aqueous medium is highly challenging because most the classical MOFs are prone to water degradation, and that reason why MOF-based sensors use a nonaqueous sensing. In this contribution, we report two new water-stable (Zn-MOF-1 Zn-MOF-2), assembled from mixed-ligand synthesis approach. Because presence hydrophobic trifluoromethyl group backbone stronger metal-N coordination, these exhibit excellent stability not only but also acidic/alkaline solutions (pH = 3-10). Here, green sensing approach by exploiting significant reduction photoluminescence ions. Fe3+ CrO42-/Cr2O72- ions could be traced with limit (LOD) micromolar range (0.045 0.745/0.33 μM Zn-MOF-1; 125.2 114.2/83.5 Zn-MOF-2). mechanistic study reveals competitive absorption excitation energy coupled fluorescent resonance transfer responsible turn-off quenching. anti-interference ability recyclability along pH gave high potential used as practical toward FeIII CrVI greenest medium.

Language: Английский

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Metal–organic frameworks (MOFs) as fluorescence sensors: principles, development and prospects

CrystEngComm, Journal Year: 2022, Volume and Issue: 24(45), P. 7881 - 7901

Published: Jan. 1, 2022

This review classifies the latest developments of MOF-based fluorescence sensors according to analytes, and discusses challenges faced by promotes some directions for future research.

Language: Английский

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Fabrication and DFT Calculation of Amine-Functionalized Metal–Organic Framework as a Turn-On Fluorescence Sensor for Fe³⁺ and Al³⁺ Ions

Inorganic Chemistry, Journal Year: 2022, Volume and Issue: 61(37), P. 14770 - 14777

Published: Sept. 7, 2022

Due to their important role in biological systems, it is urgent develop a material that can rapidly and sensitively detect the concentration of Fe3+ Al3+ ions. In this work, brand-new CdII-based metal–organic framework [Cd(BTBD)2(AIC)]n (JXUST-18, BTBD = 4,7-bis(1H-1,2,4-triazol-1-yl)-2,1,3-benzothiadiazole H2AIC 5-aminoisophthalic acid) with 4-connected sql topology was designed synthesized. The symmetrical CdII centers are linked by AIC2– ligands μ3-η1:η1:η1:η1 coordination mode form [Cd2(COO)2] secondary building unit (SBU). contiguous SBUs further connected two-dimensional (2D) layer structure. JXUST-18 remain stable aqueous solutions pH values 3–12 or boiling water. Luminescent experiments suggest displays more than eightfold fluorescence enhancement presence ions, detection limits for ions 0.196 0.184 μM, respectively. Furthermore, change luminescence color uncomplicatedly distinguishable naked eye under ultraviolet light at 365 nm. addition, series devices based on including test strips, lamp beads, composite films were developed metal via visual changes color. Significantly, rare MOF-based turn-on sensor theoretical calculation suggests complexation Fe3+/Al3+ −NH2 group contributes enhancement.

Language: Английский

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pH-Stable Zn(II) Coordination Polymer as a Multiresponsive Turn-On and Turn-Off Fluorescent Sensor for Aqueous Medium Detection of Al(III) and Cr(VI) Oxo-Anions

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(34), P. 14124 - 14133

Published: Aug. 17, 2023

Nowadays, coordination polymers (CPs) are promising candidates as sensory materials for their high sensitivity, improved selectivity, fast responsive nature, well good recyclability. However, poor chemical stability often makes practical usage limited. Herein, employing a mixed ligand approach, we constructed chemically robust CP, {[Zn2L2(DPA)2]·3H2O}n (IITKGP-70, IITKGP stands the Indian Institute of Technology Kharagpur), which exhibited excellent framework robustness not only in water but also over broad range pH solutions (pH = 3–11). The developed displayed selectivity and sensitivity detection trivalent Al3+ ions toxic hexavalent Cr(VI)-oxo anions an aqueous medium. medium turn-on phenomenon with limit (LOD) value 1.29 μM, whereas turn-off effect was observed oxo-anions (Cr2O72– CrO42–) having LOD values 0.27 0.71 respectively. Both mechanisms speculated via spectroscopic methods coupled several ex situ studies. Such multiresponsive nature (both turn-off) targeted cations simultaneously single platform robustness, ease scalability, recyclability, fast-responsive IITKGP-70 highly fascinating material real-world applications.

Language: Английский

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Synthesis and characterization of Ni@UiO-66 Metal-Organic Framework for fluorescence detection of heavy metal ions in the aqueous phase

Materials Chemistry and Physics, Journal Year: 2024, Volume and Issue: 318, P. 129245 - 129245

Published: March 29, 2024

Language: Английский

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Luminescent metal–organic frameworks as optical sensors for selective sensing towards Fe³⁺ and Cu²⁺

CrystEngComm, Journal Year: 2024, Volume and Issue: 26(5), P. 577 - 593

Published: Jan. 1, 2024

Luminescent metal–organic frameworks (LMOFs) have emerged as promising luminescent sensors for remarkable and selective sensing towards Fe 3+ Cu 2+ via a “turn-off/turn-on” strategy.

Language: Английский

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