Selective, pH sensitive, “turn on” fluorescence sensing of carbonate ions by a benzimidazole

Verma, Smita; Ravichandiran, V.; Ranjan, Nihar

doi:10.1016/j.saa.2021.119624

Cited by 20 publications

(5 citation statements)

References 34 publications

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“…While taking NMR of UiO‐66‐NH 2 ‐IM/CO 3 2− , the peak at δ=7.60 ppm (H D ) and that for the lone imino proton disappear, suggesting the detection of CO 3 2− accompanies the abstraction of these two protons. As shown in Figure S11, DFT optimization leads to the formation of a cyclic ring type H‐bonding complex structure, implying these two protons are involved in detecting CO 3 [2–66] . In the time‐dependent photoluminescence study, the emission spectra of UiO‐66‐NH 2 ‐IM in aqueous CO 3 2− solution were recorded from 0 to 90 minutes.…”

Section: Resultsmentioning

confidence: 99%

Post‐Synthetic Modification of Zr‐based Metal‐Organic Frameworks with Imidazole: Variable Optical Behavior and Sensing

et al. 2023

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UiO‐66‐NH2‐IM, a fluorescent metal‐organic framework (MOF), was synthesized by post‐synthetic modification of UiO‐66‐NH2 with 2‐imidazole carboxaldehyde via a Schiff base reaction. It was examined using various characterization techniques (PXRD, FTIR, NMR, SEM, TGA, UV‐Vis DRS, and photoluminescence spectroscopy). The emissive feature of UiO‐66‐NH2‐IM was utilized to detect volatile organic compounds (VOCs), metal ions, and anions, such as acetone, Fe3+, and carbonate (CO32‐). Acetone turns off the high luminescence of UiO‐66‐NH2‐IM in DMSO, with the limit of detection (LOD) being 3.6 ppm. Similarly, Fe3+ in an aqueous medium is detected at LOD = 0.67 μM (0.04 ppm) via quenching. On the contrary, CO32‐ in an aqueous medium significantly enhances the luminescence of UiO‐66‐NH2‐IM, which is detected with extremely high sensitivity (LOD = 1.16 µM, i.e., 0.07 ppm). Large Stern‐Volmer constant, Ksv, and low LOD values indicate excellent sensitivity of the post‐synthetic MOF. Experiments supported by density functional theory (DFT) calculations discern photo‐induced electron transfer (PET), resonance energy transfer (RET), inner filter effect (IFE), or proton abstraction as putative sensing mechanisms. NMR and computational studies propose a proton abstraction mechanism for luminescence enhancement with CO32‐. Moreover, the optical behavior of the post‐synthetic material toward analytes is recyclable.

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Section: Resultsmentioning

confidence: 99%

Post‐Synthetic Modification of Zr‐based Metal‐Organic Frameworks with Imidazole: Variable Optical Behavior and Sensing

et al. 2023

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“…However, highly sensitive and selective fluorescent sensors designed specifically for the recognition of bicarbonate (HCO and HCO 3 − ions, along with CO 2 , are the predominant carbonate compounds arising from various sources. In oceans, these anions play a vital role in regulating CO 2 balance and preventing marine acidification, mitigating adverse effects from CO 2 absorption [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Development of Fluorescent Sensors for Biorelevant Anions in Aqueous Media Using Positively Charged Quantum Dots

Silva,

Pereira,

Pereira

et al. 2024

Micromachines

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Quantum dots (QDs) have captured the attention of the scientific community due to their unique optical and electronic properties, leading to extensive research for different applications. They have also been employed as sensors for ionic species owing to their sensing properties. Detecting anionic species in an aqueous medium is a challenge because the polar nature of water weakens the interactions between sensors and ions. The anions bicarbonate (HCO3−), carbonate (CO32−), sulfate (SO42−), and bisulfate (HSO4−) play a crucial role in various physiological, environmental, and industrial processes, influencing the regulation of biological fluids, ocean acidification, and corrosion processes. Therefore, it is necessary to develop approaches capable of detecting these anions with high sensitivity. This study utilized CdTe QDs stabilized with cysteamine (CdTe-CYA) as a fluorescent sensor for these anions. The QDs exhibited favorable optical properties and high photostability. The results revealed a gradual increase in the QDs’ emission intensity with successive anion additions, indicating the sensitivity of CdTe-CYA to the anions. The sensor also exhibited selectivity toward the target ions, with good limits of detection (LODs) and quantification (LOQs). Thus, CdTe-CYA QDs show potential as fluorescent sensors for monitoring the target anions in water sources.

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“…26 Carbonate and bicarbonate ions are of specific interest as they play a major role in many physiological, environmental, and industrial processes. [27][28][29] These ions play multifaceted roles ranging from maintaining the pH of the blood to regulating the amount of dissolved CO 2 in seawater. Thus, deviation from optimum levels of bicarbonates can have far-reaching consequences, both physiologically and environmentally.…”

Section: Introductionmentioning

confidence: 99%

pH-Switchable phenylalanine-templated copper nanoclusters: CO₂ probing and efficient peroxidase mimicking activity

Shekhar,

Sarker,

Mahato

et al. 2023

Nanoscale

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Selective, pH sensitive, “turn on” fluorescence sensing of carbonate ions by a benzimidazole

Cited by 20 publications

References 34 publications

Post‐Synthetic Modification of Zr‐based Metal‐Organic Frameworks with Imidazole: Variable Optical Behavior and Sensing

Post‐Synthetic Modification of Zr‐based Metal‐Organic Frameworks with Imidazole: Variable Optical Behavior and Sensing

Development of Fluorescent Sensors for Biorelevant Anions in Aqueous Media Using Positively Charged Quantum Dots

pH-Switchable phenylalanine-templated copper nanoclusters: CO₂ probing and efficient peroxidase mimicking activity

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Selective, pH sensitive, “turn on” fluorescence sensing of carbonate ions by a benzimidazole

Cited by 20 publications

References 34 publications

Post‐Synthetic Modification of Zr‐based Metal‐Organic Frameworks with Imidazole: Variable Optical Behavior and Sensing

Post‐Synthetic Modification of Zr‐based Metal‐Organic Frameworks with Imidazole: Variable Optical Behavior and Sensing

Development of Fluorescent Sensors for Biorelevant Anions in Aqueous Media Using Positively Charged Quantum Dots

pH-Switchable phenylalanine-templated copper nanoclusters: CO2 probing and efficient peroxidase mimicking activity

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pH-Switchable phenylalanine-templated copper nanoclusters: CO₂ probing and efficient peroxidase mimicking activity