Functionalization

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Stephane Campidelli - One of the best experts on this subject based on the ideXlab platform.

  • Supramolecular Chemistry of Carbon Nanotubes
    Topics in current chemistry, 2014
    Co-Authors: Gildas Gavrel, Arianna Filoramo, Bruno Jousselme, Stephane Campidelli
    Abstract:

    This chapter aims to present recent examples of supramolecular Functionalization of carbon nanotubes. The non-covalent Functionalization appears as a solution for the future applications in nanotechnologies since it allows the Functionalization and manipulation of nanotubes without the introduction of sp 3 defects in the π-conjugated system. Thus, the optical and electronic properties of the nanotubes remain preserved. In the first part of this chapter, we present the use of surfactant for the dispersion of nanotubes and its application for sorting. Then we report several examples of Functionalization of nanotubes based on π-stacking interactions with pyrene derivatives. Finally, in the last part we review the wrapping of photo/electroactive polymers around the nanotube sidewalls. We put a particular focus on polyflurorene-based polymers and we show their utilization for the separation of nanotubes in diameter and chirality.

  • Supramolecular Chemistry of Fullerenes and Carbon Nanotubes - Supramolecular Chemistry of Carbon Nanotubes
    Topics in Current Chemistry, 2013
    Co-Authors: Gildas Gavrel, Arianna Filoramo, Bruno Jousselme, Stephane Campidelli
    Abstract:

    This chapter aims to present recent examples of supramolecular Functionalization of carbon nanotubes. The non-covalent Functionalization appears as a solution for the future applications in nanotechnologies since it allows the Functionalization and manipulation of nanotubes without the introduction of sp 3 defects in the π-conjugated system. Thus, the optical and electronic properties of the nanotubes remain preserved. In the first part of this chapter, we present the use of surfactant for the dispersion of nanotubes and its application for sorting. Then we report several examples of Functionalization of nanotubes based on π-stacking interactions with pyrene derivatives. Finally, in the last part we review the wrapping of photo/electroactive polymers around the nanotube sidewalls. We put a particular focus on polyflurorene-based polymers and we show their utilization for the separation of nanotubes in diameter and chirality.

Frédéric Guittard - One of the best experts on this subject based on the ideXlab platform.

  • Nanoparticle covered surfaces: An efficient way to enhance superhydrophobic properties
    Materials and Design, 2016
    Co-Authors: Guilhem Godeau, Caroline Szczepanski, Thierry Darmanin, Frédéric Guittard
    Abstract:

    Surface post-Functionalization is one of the key modification pathways leading to superhydrophobic surfaces. The Functionalization is deeply linked to the functionalizable area and the number of functionalizable groups. By grafting functional nanoparticles onto surfaces it is possible to dramatically increase both the area and the number of functionalizable groups. In this work, we report the elaboration of platform surfaces for direct Functionalization by grafting nanoparticles and Functionalization using the Huisgen reaction. The surfaces were functionalized with various hydrophobic side chain including alkyl, aryl and perfluorinated chains. The modified surfaces have enhanced hydrophobic, parahydrophobic or superhydrophobic properties. The surfaces were investigated for their wettability, morphology and roughness. This work shows that the use of nanoparticles to increase functionalizable surface area can highly enhance surface hydrophobic properties.

  • Post-Functionalization of azido or alkyne poly(3,4-ethylenedioxythiophene) surfaces: Superhydrophobic and parahydrophobic surfaces
    Macromolecular Chemistry and Physics, 2016
    Co-Authors: Guilhem Godeau, Thierry Darmanin, Kévin Boutet, Frédéric Guittard
    Abstract:

    Post-Functionalization is a key tool for the elaboration of hydrophobic surfaces. For that purpose, the elaboration of surfaces suitable for the Huisgen reaction allows for Functionalization with various hydrophobic side chains. Here we report the synthesis of azido or alkyne monomers to prepare platform surfaces suitable for click chemistry. The surface hydrophobicity and morphology are investigated. Superhydrophobic and parahydrophobic properties are obtained depending on the starting monomer and the molecule used for the post-Functionalization.

  • staudinger vilarassa reaction a powerful tool for surface modification and superhydrophobic properties
    Journal of Colloid and Interface Science, 2015
    Co-Authors: Guilhem Godeau, Thierry Darmanin, Frédéric Guittard
    Abstract:

    Abstract Here we report for the time, the use of Staudinger–Vilarrasa reaction for fast surface Functionalization. Using poly(3,4-ethylenedioxythiophene) nanofibrous surfaces bearing azido groups, this reaction allows for the Functionalization of surfaces with amide linker in just 3 h. The Functionalization by long alkyl chains induces the formation of highly hydrophobic surfaces while the surface structures are preserved. This reaction can be a key pathway for fast surface modification for a large range of applications such as in cell or bacterial adhesion, for example.

Andrey P Antonchick - One of the best experts on this subject based on the ideXlab platform.

  • Metal-Catalyzed Oxidative Coupling of Ketones and Ketone Enolates
    Synthesis, 2018
    Co-Authors: Sandip Murarka, Andrey P Antonchick
    Abstract:

    Recent years have witnessed a significant advancement in the field of radical oxidative coupling of ketones towards the synthesis of highly useful synthetic building blocks, such as 1,4-dicarbonyl compounds, and biologically important heterocyclic and carbocyclic compounds. Besides oxidative homo- and cross-coupling of enolates, other powerful methods involving direct C(sp3)–H Functionalizations of ketones­ have emerged towards the synthesis of 1,4-dicarbonyl compounds. Moreover, direct α-C–H Functionalization of ketones has also allowed an efficient access to carbocycles and heterocycles. This review summarizes all these developments made since 2008 in the field of metal-catalyzed/promoted radical-mediated Functionalization of ketones at the α-position. 1 Introduction 2 Synthesis of 1,4-Dicarbonyl Compounds 3 Synthesis of Heterocyclic Scaffolds 4 Synthesis of Carbocyclic Scaffolds 5 Conclusion

  • a metal free oxidative dehydrogenative diels alder reaction for selective Functionalization of alkylbenzenes
    Chemistry: A European Journal, 2017
    Co-Authors: Srimanta Manna, Andrey P Antonchick
    Abstract:

    Functionalization of C(sp3)−H bonds under metal-free reaction conditions is a great challenge due to poor bond reactivity. A novel metal-free oxidative dehydrogenative Diels–Alder reaction of alkylbenzene derivatives with alkenes through C(sp3)−H bond Functionalization is described. The developed oxidative method provides a straightforward approach to biologically relevant 1,4-phenanthraquinone and isoindole derivatives from readily available starting materials. Furthermore, the synthesis of nitrostyrenes from enylbenzene derivatives by selective C(sp3)−H bond Functionalization has been demonstrated.

  • hypervalent iodine iii in direct carbon hydrogen bond Functionalization
    Synlett, 2015
    Co-Authors: Rishikesh Naraya, Srimanta Manna, Andrey P Antonchick
    Abstract:

    Direct methods of novel bond formation through Functionalization of nonreactive carbon–hydrogen bonds represent an efficient synthetic approach. Cross-dehydrogenative coupling has emerged as an area of huge potential and importance for novel bond formation. The application of hypervalent iodine(III) reagents in direct carbon–hydrogen bond Functionalization reactions is of immense interest because the Functionalization of the nonreactive carbon–hydrogen bonds proceeds under metal-free reaction conditions. This account covers recent developments in the area of hypervalent iodine(III) mediated direct carbon–hydrogen bond Functionalization. 1 Introduction 2 Intramolecular Amination for Carbazole Synthesis 3 Intermolecular Amination 4 Intermolecular Annulation 5 Intermolecular Nucleophilic Amination 6 Hypervalent Iodine(III) Mediated Radical Reactions 6.1 Cross-Dehydrogenative Coupling of a Heterocycle and an Aldehyde 6.2 Cross-Dehydrogenative Coupling of a Heterocycle and an Alkane 6.3 Intramolecular Cyclization 7 Conclusion

  • Regioselective Metal-Free Cross-Coupling of Quinoline N-Oxides with Boronic Acids
    Organic Letters, 2015
    Co-Authors: Luis Bering, Andrey P Antonchick
    Abstract:

    A novel and operationally simple one-step C–H bond Functionalization of quinoline N-oxides to 2-substituted quinolines was developed. This approach enables the regioselective Functionalization under external oxidant- and metal-free conditions. The developed transformation represents the first application of the Petasis reaction in Functionalization of heterocycles.

Gildas Gavrel - One of the best experts on this subject based on the ideXlab platform.

  • Supramolecular Chemistry of Carbon Nanotubes
    Topics in current chemistry, 2014
    Co-Authors: Gildas Gavrel, Arianna Filoramo, Bruno Jousselme, Stephane Campidelli
    Abstract:

    This chapter aims to present recent examples of supramolecular Functionalization of carbon nanotubes. The non-covalent Functionalization appears as a solution for the future applications in nanotechnologies since it allows the Functionalization and manipulation of nanotubes without the introduction of sp 3 defects in the π-conjugated system. Thus, the optical and electronic properties of the nanotubes remain preserved. In the first part of this chapter, we present the use of surfactant for the dispersion of nanotubes and its application for sorting. Then we report several examples of Functionalization of nanotubes based on π-stacking interactions with pyrene derivatives. Finally, in the last part we review the wrapping of photo/electroactive polymers around the nanotube sidewalls. We put a particular focus on polyflurorene-based polymers and we show their utilization for the separation of nanotubes in diameter and chirality.

  • Supramolecular Chemistry of Fullerenes and Carbon Nanotubes - Supramolecular Chemistry of Carbon Nanotubes
    Topics in Current Chemistry, 2013
    Co-Authors: Gildas Gavrel, Arianna Filoramo, Bruno Jousselme, Stephane Campidelli
    Abstract:

    This chapter aims to present recent examples of supramolecular Functionalization of carbon nanotubes. The non-covalent Functionalization appears as a solution for the future applications in nanotechnologies since it allows the Functionalization and manipulation of nanotubes without the introduction of sp 3 defects in the π-conjugated system. Thus, the optical and electronic properties of the nanotubes remain preserved. In the first part of this chapter, we present the use of surfactant for the dispersion of nanotubes and its application for sorting. Then we report several examples of Functionalization of nanotubes based on π-stacking interactions with pyrene derivatives. Finally, in the last part we review the wrapping of photo/electroactive polymers around the nanotube sidewalls. We put a particular focus on polyflurorene-based polymers and we show their utilization for the separation of nanotubes in diameter and chirality.

George P. Simon - One of the best experts on this subject based on the ideXlab platform.

  • Effect of different microwave-based treatments on multi-walled carbon nanotubes
    Journal of Nanoparticle Research, 2010
    Co-Authors: Pejman Hojati-talemi, Raoul Cervini, George P. Simon
    Abstract:

    Three new methods for the Functionalization of multi-walled carbon nanotubes (MWCNTs) are reported using microwave (MW) energy and water as a mild chemical agent. In the first method we reported the effect of MW irradiation on a dispersion of MWCNTs in deionized water, in the second method we studied the exposing of MWCNT to microwave irradiation in the presence of steam, and in the third method we used microwave oven-generated plasma for the Functionalization of MWCNTs. We also performed thermal oxidation and acid treatment as two conventional methods for oxidative Functionalization of carbon nanotubes, to compare their effect with our results. Transmission electron microscopy (TEM) and Raman spectroscopy results showed that although these microwave methods introduced some defects to the carbon nanotubes, the damage was less severe than conventional treatments. X-ray photoelectron spectroscopy (XPS) measurements confirmed that the Functionalization of carbon nanotubes by these methods favored hydroxyl groups, which are useful when further Functionalization is required.