Nanocarbons in quantum regime: An emerging sustainable catalytic platform for organic synthesis

Dandia, Anshu; Saini, Pratibha; Sethi, Mukul; Kumar, Krishan; Saini, Surendra Kumar; Meena, Savita; Meena, Swati; Parewa, Vijay

doi:10.1080/01614940.2021.1985866

Cited by 15 publications

(4 citation statements)

References 182 publications

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“…Recently, CQDs are recognized as a facial, effective sustainable catalyst in synthetic organic chemistry because of their assessable surface functional groups. 17,18 Owing to their distinct applications numerous methodologies have been developed for their synthesis such as arc discharge, laser ablation, electrochemical oxidation, acidic oxidation, thermal combustion, hydrothermal oxidation, microwave pyrolysis of different chemical-based carbon sources. 19 Many of these strategies have some disadvantages such as multistep fabrication, a complicated setup, expensive starting materials and processes, post separation techniques, required strong acidic environments, low yields, time-consuming processes, and surface passivation.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon quantum dots (CQDs) are zero-dimensional carbon-based nanomaterials and have attracted considerable interest due to their exceptional biocompatibility, low toxicity, resistance to photobleaching, tunable luminescence properties and high-temperature stability. − As a result, they show growing applications in sensing, bioimaging, drug delivery, and medical diagnosis, LED production, energy conversion and storage, and so on. Recently, CQDs are recognized as a facial, effective sustainable catalyst in synthetic organic chemistry because of their assessable surface functional groups. , Owing to their distinct applications numerous methodologies have been developed for their synthesis such as arc discharge, laser ablation, electrochemical oxidation, acidic oxidation, thermal combustion, hydrothermal oxidation, microwave pyrolysis of different chemical-based carbon sources . Many of these strategies have some disadvantages such as multistep fabrication, a complicated setup, expensive starting materials and processes, post separation techniques, required strong acidic environments, low yields, time-consuming processes, and surface passivation.…”

Section: Introductionmentioning

confidence: 99%

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Unlocking the Molecular Behavior of Natural Amine-Targeted Carbon Quantum Dots for the Synthesis of Diverse Pharmacophore Scaffolds via an Unusual Nanoaminocatalytic Route

Saini,

Kumar

et al. 2023

ACS Appl. Mater. Interfaces

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Despite the fact that carbon quantum dots (CQDs) have significant catalytic potential, only emblematic applications that rely on simple acid−base or hydrogen-bonding activation pathways have been reported. In this study, natural amine-targeted CQDs (NAT-CQDs) have been successfully fabricated using a sustainable technique that harnesses a renewable green source. Based on a holistic sustainable assessment, the present approach for the synthesis of NAT-CQDs surpasses previously reported methods in terms of estimated circular and good-manufacturingpractice metrics. A set of spectroscopic and analytical techniques, including FTIR, XPS, conductometric assay, pH titration, 19 FNMR, and 13 CNMR confirms the presence of the assessable amino-rich groups (0.0083N) at the surface of NAT-CQDs. The occurrence of surface amine groups unlocked the molecular behavior of asprepared NAT-CQDs and makes them an unprecedented nanoaminocatalytic platform for the synthesis of diverse pharmacophore scaffolds (>40 examples) via a one-pot Knoevenagel/(aza) Michael addition reaction in water at room temperature. The assessable amine group can covalently activate carbonyl groups through nucleophilic iminium activation modes in water and facilitate the ability to build valuable and therapeutic scaffolds on a gram scale. By transferring significant molecular primacy at the frontier of nanoscale materials, NAT-CQDs can thus bridge the gap between the nanoscale and molecular domains. This protocol can also be applied for the preparation of therapeutic anticoagulant drugs, warfarin, and coumachlor. All the reactions exhibited a high atom economy, low E-factor, low process mass intensity (PMI), high reaction mass efficiency (RME), high carbon efficiency (CE), and high catalyst reusability with overall high sustainable values. NAT-CQDs show high recyclability, and the spectral data of reused catalysts indicate that the NAT-CQDs maintained their surface chemistry and electronic properties, suggesting their stability under the tested conditions. This study presents a remarkable instance of NAT-CQDs showcasing covalent catalysis. Expanding on the aforementioned design concept, the utilization of NAT-CQDs' "potential" as distinct colloidal organocatalysts in aqueous environments at the molecular level introduces valuable prospects for aminocatalytic pathways.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unlocking the Molecular Behavior of Natural Amine-Targeted Carbon Quantum Dots for the Synthesis of Diverse Pharmacophore Scaffolds via an Unusual Nanoaminocatalytic Route

Saini,

Kumar

et al. 2023

ACS Appl. Mater. Interfaces

Self Cite

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“…Firstly, the abundant oxygen-containing functional groups (e.g., hydroxyl groups, etc.) on the carbon quantum dots provide more activation sites and promote the interaction between the reaction components; secondly, the conjugated structure of the carbon dots promotes the adsorption of the substrate on the catalyst surface by the π–π interactions of the benzene ring [ 34 ]; and lastly, the introduction of the carbon quantum dots improves the energy band distribution of the Cu 2 O and facilitates the separation and movement of the carriers [ 35 ]. Entries 1–4 demonstrate that light is an important driving force for benzyl alcohol oxidation.…”

Section: Resultsmentioning

confidence: 99%

Carbon Quantum Dots/Cu2O Photocatalyst for Room Temperature Selective Oxidation of Benzyl Alcohol

Tong,

Liu,

et al. 2024

Nanomaterials

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The luminescence properties and excellent carrier transfer ability of carbon quantum dots (CQDs) have attracted much attention in the field of photocatalysis. In this work, we loaded the CQDs on the surface of Cu2O to enhance the visible-light property of Cu2O. Furthermore, the composite was used for selective oxidation of benzyl alcohol to benzaldehyde. The composite catalyst achieved high selectivity (90%) for benzaldehyde at room temperature, leveraging its visible-light-induced electron transfer properties and its photocatalytic activity for hydrogen peroxide decomposition. ·OH was shown to be the main reactive oxygen species in the selective oxidation reaction of benzyl alcohol. The formation of heterostructures of CQDs/Cu2O promoted charge carrier separation and provided a fast channel for photoinduced electron transfer. This novel material exhibited enhanced levels of activity and stability for selective oxidation of benzyl alcohol. Potential applications of carbon quantum dot composites in conventional alcohol oxidation reactions are shown.

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“…In 2004, during the purification of single-walled carbon nanotubes, a compound was randomly synthesized with an average diameter about 5 nm that called the carbon quantum dots (CQDs) [ 1 – 3 ]. Then, due to its unique properties such as high solubility in water, optical stability, fluorescence properties were considered by researchers, and also have different applications such as catalysts, and sensors [ 4 , 5 ]. By the way, various methods used to synthesize of CQDs, among which the hydrothermal method is more popular.…”

Section: Introductionmentioning

confidence: 99%

Nano-probe for determination of phenobarbital of green synthesized fluorescent carbon dots using Scrophularia striata

Mohammadi

Haghnazari

Karami³

2023

J Mater Sci: Mater Electron

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In this study, using a thirsty plant extract and a simple hydrothermal method, a nano-probe was introduced to detect the phenobarbital based on fluorescence. Functional groups, particle size, surface morphology, and types of elements were identified using analysis such as FTIR, TEM, SEM, EDX, respectively. The excitation at 355 nm and emission intensity at 446 nm for nano-probe, the nano-probe shows that various parameters such as pH, temperature, and time were investigated for optimization conditions. After optimizing the factors affecting the sensor’s response, a linear range between 0 and 750 µM with a detection limit of 5 µM was obtained. Then, the effect of interfering with other materials was investigated and finally, the ability of this sensor to measure the phenobarbital in real samples has been studied.

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Nanocarbons in quantum regime: An emerging sustainable catalytic platform for organic synthesis

Cited by 15 publications

References 182 publications

Unlocking the Molecular Behavior of Natural Amine-Targeted Carbon Quantum Dots for the Synthesis of Diverse Pharmacophore Scaffolds via an Unusual Nanoaminocatalytic Route

Unlocking the Molecular Behavior of Natural Amine-Targeted Carbon Quantum Dots for the Synthesis of Diverse Pharmacophore Scaffolds via an Unusual Nanoaminocatalytic Route

Carbon Quantum Dots/Cu2O Photocatalyst for Room Temperature Selective Oxidation of Benzyl Alcohol

Nano-probe for determination of phenobarbital of green synthesized fluorescent carbon dots using Scrophularia striata

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