Boric-acid-functionalized luminescent sensor for detection of chromate ions in aqueous solution

Jain, Shikha; Nehra, Monika; Dilbaghi, Neeraj; Kumar, Rajesh; Kumar, Sandeep

doi:10.1016/j.matlet.2021.130933

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…28 In addition, compared with the N-CDs@UiO-66-(COOH) 2, the strong peak (200−250 nm) of N-CDs@Eu-UiO-66-(COOH) 2 , which is ascribed to the π−π* transition, is obviously weakened, also indicating that the successful modification of Eu 3+ on the surface of N-CDs@UiO-66-(COOH) 2 . 29,30 It is worth noting that the N-CDs were encapsulated in the pores of the Eu@ UiO-66-(COOH) 2 , and their photostability and resistance to photobleaching have an obvious improvement. As shown in Figure 2C, in the aqueous solution the fluorescence of the N-CDs at 440 nm is significantly weakened after standing for more than 2 h, while upon encapsulation in the MOFs, the fluorescence of the N-CDs at 440 nm remains stable in 24 h. Also, as shown in Figure 2D, encapsulation in the MOFs of the N-CDs have good resistance to photobleaching.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Selective Determination of HOCl in Environmental Water Samples and Real-Time Detection of HOCl Levels in Live Cells via Ratio Fluorescence Imaging Based on Eu³⁺-Modified and Carbon Dot-Encapsulated Metal Organic Frameworks

Zhang,

Tong

2024

ACS Appl. Nano Mater.

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Hypochlorous acid (HOCl) is one kind of significant ROS and a typical environmental pollution, which is closely linked to our food chain and threatens human health. Hence, a dual-emission ratiometric fluorescent nanoprobe (N-CDs@Eu-UiO-66-(COOH)2) for sensitive and specific determination of HOCl was fabricated based on Eu3+-modified and carbon dot-encapsulated MOFs. The N-CDs were encapsulated into MOFs, which can greatly improve their photostability and resistance to photobleaching in aqueous solution. The N-CDs@UiO-66-(COOH)2 was modified by Eu3+ ions, which can emit the red characteristic fluorescence of Eu3+ ions via the antenna effect. HOCl can quench the fluorescence of N-CDs through oxidizing hydroxyl groups on its surface, while the characteristic fluorescence of Eu3+ remains unchanged. The ratiometric fluorescence nanoprobe of N-CDs@Eu-UiO-66-(COOH)2 was thus fabricated for detecting HOCl. The nanoprobe has high sensitivity and selectivity, and its LOD (3σ/K) can attain 15.0 nM. Moreover, the N-CDs@Eu-UiO-66-(COOH)2 nanoprobe can also be applied for real-time detection of HOCl levels in the live cells via ratio fluorescence imaging, which can serve as a noninvasive tool for sensitively detecting fluctuations of HOCl levels in the living cells. This work can provide a promising application in environmental monitoring and real-time monitoring HOCl levels in vivo.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Selective Determination of HOCl in Environmental Water Samples and Real-Time Detection of HOCl Levels in Live Cells via Ratio Fluorescence Imaging Based on Eu³⁺-Modified and Carbon Dot-Encapsulated Metal Organic Frameworks

Zhang,

Tong

2024

ACS Appl. Nano Mater.

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“…The nucleophilic addition reaction between cyanide and DCV group resulted in the loss of conjugation and the decrease of fluorescence intensity. Jain et al reported a boric-acid-functionalized Eu-MOFs-based sensor for Cr 2 O 7 2- detection [ 103 ]. The red fluorescence of dual-emission MOFs was quenched and the blue emission was enhanced.…”

Section: Chemosensorsmentioning

confidence: 99%

An Overview of the Design of Metal-Organic Frameworks-Based Fluorescent Chemosensors and Biosensors

et al. 2022

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Taking advantage of high porosity, large surface area, tunable nanostructures and ease of functionalization, metal-organic frameworks (MOFs) have been popularly applied in different fields, including adsorption and separation, heterogeneous catalysis, drug delivery, light harvesting, and chemical/biological sensing. The abundant active sites for specific recognition and adjustable optical and electrical characteristics allow for the design of various sensing platforms with MOFs as promising candidates. In this review, we systematically introduce the recent advancements of MOFs-based fluorescent chemosensors and biosensors, mainly focusing on the sensing mechanisms and analytes, including inorganic ions, small organic molecules and biomarkers (e.g., small biomolecules, nucleic acids, proteins, enzymes, and tumor cells). This review may provide valuable references for the development of novel MOFs-based sensing platforms to meet the requirements of environment monitoring and clinical diagnosis.

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Synthesis of Cd‐MOF and Eu³⁺@Cd‐MOF as Multitarget Sensors for Simultaneous Sensing Cr (VI) Anion and 4‐NA

Wang,

Xie

et al. 2024

Applied Organom Chemis

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Metal–organic frameworks (MOFs) as a kind of sensing material plays an important role for environmental monitoring and human health. In this paper, we prepared a luminescent Cd‐MOF: [Cd2L·4H2O]·H2O. (H4L = 2,5‐bis‐(3,4‐dicarboxy‐phenyl)thiophene‐amide) under the solvothermal condition. Single crystal X‐ray diffraction analysis shows that Cd‐MOF has a 2D layer structure, and it exhibits a strong fluorescence emission at 470 nm. The sensing experiment displays Cd‐MOF as multitarget probe can selectively detect Cr (VI) anions and 4‐nitroaniline (4‐NA) with high sensitivity, good anti‐interference ability, and good recyclability. In addition, dual‐emission Eu3+@Cd‐MOF was obtained by encapsulating Eu3+ ions into Cd‐MOF, in which Cd‐MOF sensitizes Eu3+ ion emission. Accordingly, Eu3+@Cd‐MOF also acts as multitarget and self‐calibrated probe to selectively detect Cr (VI) ions and 4‐NA synchronously at the same conditions. However, the changes of fluorescence emissions of Eu3+@Cd‐MOF toward Cr (VI) ions are different from that of the original Cd‐MOF. The possible sensing mechanism be attributed to the competitive energy absorption between Cd‐MOF or Eu3+@Cd‐MOF and the analytes. All the results may provide broad prospects for developing multitarget sensing platform for sensing environment pollutants.

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Boric-acid-functionalized luminescent sensor for detection of chromate ions in aqueous solution

Cited by 7 publications

References 12 publications

Selective Determination of HOCl in Environmental Water Samples and Real-Time Detection of HOCl Levels in Live Cells via Ratio Fluorescence Imaging Based on Eu³⁺-Modified and Carbon Dot-Encapsulated Metal Organic Frameworks

Selective Determination of HOCl in Environmental Water Samples and Real-Time Detection of HOCl Levels in Live Cells via Ratio Fluorescence Imaging Based on Eu³⁺-Modified and Carbon Dot-Encapsulated Metal Organic Frameworks

An Overview of the Design of Metal-Organic Frameworks-Based Fluorescent Chemosensors and Biosensors

Synthesis of Cd‐MOF and Eu³⁺@Cd‐MOF as Multitarget Sensors for Simultaneous Sensing Cr (VI) Anion and 4‐NA

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Boric-acid-functionalized luminescent sensor for detection of chromate ions in aqueous solution

Cited by 7 publications

References 12 publications

Selective Determination of HOCl in Environmental Water Samples and Real-Time Detection of HOCl Levels in Live Cells via Ratio Fluorescence Imaging Based on Eu3+-Modified and Carbon Dot-Encapsulated Metal Organic Frameworks

Selective Determination of HOCl in Environmental Water Samples and Real-Time Detection of HOCl Levels in Live Cells via Ratio Fluorescence Imaging Based on Eu3+-Modified and Carbon Dot-Encapsulated Metal Organic Frameworks

An Overview of the Design of Metal-Organic Frameworks-Based Fluorescent Chemosensors and Biosensors

Synthesis of Cd‐MOF and Eu3+@Cd‐MOF as Multitarget Sensors for Simultaneous Sensing Cr (VI) Anion and 4‐NA

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Selective Determination of HOCl in Environmental Water Samples and Real-Time Detection of HOCl Levels in Live Cells via Ratio Fluorescence Imaging Based on Eu³⁺-Modified and Carbon Dot-Encapsulated Metal Organic Frameworks

Selective Determination of HOCl in Environmental Water Samples and Real-Time Detection of HOCl Levels in Live Cells via Ratio Fluorescence Imaging Based on Eu³⁺-Modified and Carbon Dot-Encapsulated Metal Organic Frameworks

Synthesis of Cd‐MOF and Eu³⁺@Cd‐MOF as Multitarget Sensors for Simultaneous Sensing Cr (VI) Anion and 4‐NA