Papers by Adyasha Panigrahi
Faraday Discussions, 2021
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Journal of the American Chemical Society, Aug 8, 2017
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Chemical Communications, 2020
The cross-dehydrogenative arylation of benzylic C–H bonds with arenes provides straightforward ac... more The cross-dehydrogenative arylation of benzylic C–H bonds with arenes provides straightforward access to synthetically useful 1,1-diarylmethanes, from readily available starting materials.
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Nanoscale, 2023
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ACS applied nano materials, Sep 12, 2022
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Carbon, 2022
Abstract Assisted Liquid-Phase Exfoliation (LPE) with pyrene derivatives has been shown to be ver... more Abstract Assisted Liquid-Phase Exfoliation (LPE) with pyrene derivatives has been shown to be very effective at producing stable and concentrated 2D material dispersions in water. However, the microscopic exfoliation mechanism is still not completely known. Initial models have proposed the intercalation of pyrene molecules between the layers, but it is unclear if these molecules remain trapped or not and if they can affect the morphology of the nanosheets. In this work we show an extensive atomic force microscopy characterization study on the size and thickness of graphene, MoS2 and WS2 nanosheets produced by LPE in water using different pyrene derivatives. Our results show that the nanosheet lateral size scales with thickness and layer number by a power-law regardless of stabiliser type or material class. By using the equipartition model, we could rule out the presence of intercalated molecules between the layers; remarkably, we found that the pyrene stabilizer does affect the nanosheets morphology as it preferentially drives tearing over peeling during exfoliation. Finally, we determine the apparent thickness of a single layer to be ∼1-1.5 nm.
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Chemical Science, 2020
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Journal of the American Chemical Society, Jul 9, 2018
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Nanoscale
Biocompatible cationic graphene flakes efficiently complex and deliver the enzyme to the lysosome... more Biocompatible cationic graphene flakes efficiently complex and deliver the enzyme to the lysosomes of the fibroblasts derived from the patients with Mucopolysaccharidosis VI, leading to enhanced degradation of the accumulated lysosomal substrate.
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ACS Applied Nano Materials
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Carbon, 2021
Abstract Assisted Liquid-Phase Exfoliation (LPE) with pyrene derivatives has been shown to be ver... more Abstract Assisted Liquid-Phase Exfoliation (LPE) with pyrene derivatives has been shown to be very effective at producing stable and concentrated 2D material dispersions in water. However, the microscopic exfoliation mechanism is still not completely known. Initial models have proposed the intercalation of pyrene molecules between the layers, but it is unclear if these molecules remain trapped or not and if they can affect the morphology of the nanosheets. In this work we show an extensive atomic force microscopy characterization study on the size and thickness of graphene, MoS2 and WS2 nanosheets produced by LPE in water using different pyrene derivatives. Our results show that the nanosheet lateral size scales with thickness and layer number by a power-law regardless of stabiliser type or material class. By using the equipartition model, we could rule out the presence of intercalated molecules between the layers; remarkably, we found that the pyrene stabilizer does affect the nanosheets morphology as it preferentially drives tearing over peeling during exfoliation. Finally, we determine the apparent thickness of a single layer to be ∼1-1.5 nm.
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Faraday Discussions, 2021
Pyrene derivatives with extremely low solubility can be exceptionally efficient as exfoliating ag... more Pyrene derivatives with extremely low solubility can be exceptionally efficient as exfoliating agents.
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Organic & Biomolecular Chemistry, 2021
Various functionalised 4-amino-2-(methylthio)quinolines are synthesised through triflic acid-medi... more Various functionalised 4-amino-2-(methylthio)quinolines are synthesised through triflic acid-mediated N-heteroannulation of α-functionalized-β-anilino-β-(methylthio)acrylonitriles for the first time. The N-heteroannulation process is highly chemoselective and mild reaction conditions. However, this process fails in...
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Chemical Science, 2020
Novel pyrene surfactants for aqueous graphene exfoliation were prepared via C–H arylation of pyre... more Novel pyrene surfactants for aqueous graphene exfoliation were prepared via C–H arylation of pyrene-1-carboxylic acid.
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ACS Catalysis, 2020
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Journal of the American Chemical Society, 2018
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Journal of the American Chemical Society, 2017
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European Journal of Organic Chemistry, 2013
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Chemistry – A European Journal, 2016
Herein we report the first Ru‐catalyzed C−H arylation of benzoic acids with readily available ary... more Herein we report the first Ru‐catalyzed C−H arylation of benzoic acids with readily available aryl (pseudo)halides. The reaction, which does not require the use of silver salt additives, allows the arylation of previously challenging hindered benzoic acids and the use of generally unreactive ortho‐substituted halorarenes. Furthermore, our new protocol can efficiently be applied to indole carboxylic acids, thus allowing access to C7‐, C6‐, C5‐ and C4‐arylated indole compounds, a departure from the classical enhanced reactivity of the C2 and C3 positions of indole.
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Papers by Adyasha Panigrahi