A Recyclable bi‐functional Luminescent Zinc (II) metal–organic framework as highly selective and sensitive sensing probe for nitroaromatic explosives and Fe³⁺ ions

Abstract

By introducing carboxyl tag to the aromatic ligands system and borrowing the organic template open framework idea, a stable fluorescent Zn metal–organic framework was successfully prepared through a rigid ligand H6L (3,5‐bis‐(3‐carboxyphenoxy)benzoic acid) under hydrothermal conditions. The selectivity and sensitivity of the Zn‐MOF to metal ions and nitro‐aromatic compounds (NACs) were investigated by fluorescence quenching. And the Zn‐MOF showed a high sensibility of nitro‐aromatic compounds (NACs) and Fe3+ ions, especially for 4‐(4‐nitropheny lazo) resorcinol (NPLR). More importantly, the detection limit of the Zn‐MOF for detecting NPLR solution was found to be 1.71 ppb. Moreover, this sensor is remarkable recyclable and is promisingly applied for rapid, on‐site and sensing of explosive residuals.

A Water-Stable Zn-MOF Used as Multiresponsive Luminescent Probe for Sensing Fe3+/Cu2+, Trinitrophenol and Colchicine in Aqueous Medium

“…This quenching effect was analyzed by linear Stern-Volmer (S-V) equation: I 0 / I = 1 + K sv [M], where K sv and [M] refer to the quenching constant and the concentration of metal ions, I 0 represents the initial fluorescence intensity, and I denotes the intensities after the addition of Fe 3+ or Cu 2+ . The Stern-Volmer plots for Fe 3+ or Cu 2+ were nearly linear with a correlation coefficient of 0.95, 0.97 for the compound, and the slope of K sv was calculated to be 3.64 × 10 4 M −1 , 6.83 × 10 3 M −1 ( Figures S6 and S7 ), which was higher than some reported results [ 32 , 33 , 34 ]. According to the equation of LOD = 3σ/k, the limits of detection of Fe 3+ and Cu 2+ were 1.95 mM, 10.4 mM respectively, and the results indicated that the compound could be use as sensitive luminescence probe toward Fe 3+ /Cu 2+ .…”

A Stable 3D Zn-Coordination Polymer Sensor Based on Dual Luminescent Ligands for Efficient Detection of Multiple Analytes under Acid or Alkaline Environment

“…and some very popular luminescent ligands. − Some luminescence sensors that use LCP recognition have been presented. Gao’s group synthesized a Zn II -based CP showing a high sensibility for Fe 3+ ions and nitro-aromatic compounds (NACs) in aqueous solution. Cui’s group synthesized a Co II -based coordination polymer, which is the first dual-responsive fluorescent chemosensor for the selective detection of Hacac and Cr 2 O 7 2– ions (pH = 3.0) in ethanol or aqueous solutions.…”

Self-Assembled Cd-MOF Material Supported by a Triazine Skeleton: Stimuli Response to Traces of Nitroaromatics and Amines

“…According to the Stern–Volmer (S–V) formula ( I 0 / I = K SV [ Q ] + 1, where I 0 and I are the fluorescence intensity before and after adding nitro compounds, [ Q ] is the concentration of nitro compounds, and K SV is the quenching constant), the K SV values were calculated to be 1.4778 × 10 5 , 1.4317 × 10 5 , and 8.3002 × 10 5 M –1 . In addition, the detection limits were calculated to be 0.079.6, 0.0908, and 0.0156 μM, respectively. The extremely low detection limit indicated that Cd-MOF as a nitro compound sensor has great advantages.…”

“…Nitro aromatic compounds (NACs) are widely used in the field of engineering blasting, space applications, explosive forming, and weapon systems. , However, they are highly poisonous and have always been a major safety hazard for human and environmental problems and even threaten national security. − Therefore, the scientific community has been attributed to developing detection methods for NACs . At present, the methods for detecting NACs include gas chromatography coupled with mass spectrometry, X-ray imaging and ion mobility spectroscopy, , Raman spectroscopy, and neutron activation analysis and luminescent sensing detection. − Among them, the luminescent sensing detection method has received growing attention because of the simple operation and high sensitivity. , O -Phenylenediamine (OPD), m -phenylenediamine (MPD), and p -phenylenediamine (PPD), as a class of isomers of primary aromatic amines, are important raw materials or intermediates in the chemical industry .…”