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Deschenaux, Robert

Nom
Deschenaux, Robert
Affiliation principale
Fonction
Professeur ordinaire
Email
Robert.Deschenaux@unine.ch
Identifiants
https://libra.unine.ch/handle/123456789/384

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  • Publication
    Accès libre
    Optically active liquid-crystalline fullerodendrimers from enantiomerically pure fulleropyrrolidines
    (2010)
    Lincker, Frédéric
    ;
    Bourgun, Philippe
    ;
    Stoeckli-Evans, Helen 
    ;
    Saez, Isabel M.
    ;
    Goodby, John W.
    ;
    Deschenaux, Robert 
    A synthetic methodology based on the 1,3-dipolar cycloaddition reaction was developed to design enantiomerically pure liquid-crystalline fullerodendrimers.
  • Publication
    Métadonnées seulement
    Diastereoisomerically Pure Fulleropyrrolidines as Chiral Platforms for the Design of Optically Active Liquid Crystals
    (2010)
    Campidelli, Stephane
    ;
    Bourgun, Philippe
    ;
    Guintchin, Boris
    ;
    Furrer, Julien
    ;
    Stoeckli-Evans, Helen 
    ;
    Saez, Isabel M.
    ;
    Goodby, John W.
    ;
    Deschenaux, Robert 
    Incorporation of [60]fullerene (C60) within self-organizing systems is conceptually challenging but allows us to obtain materials which combine the characteristics (anisotropy, organization) of condensed mesophases with the properties of C60 (photo- and electrochem. activity). Here, the authors report on the synthesis, characterization, and liq.-cryst. properties of four optically active fullerodendrimers, which are chiral at the point of conjunction between the fullerene scaffold and the mesogenic moieties. Thus, the novelty of this study is to take advantage of the asym. carbon atom created during the 1,3-dipolar cycloaddn. reaction on C60 in order to induce mesoscopic chirality in the materials. Four diastereoisomeric fulleropyrrolidines ((R,S)-1, (R,R)-1, (S,R)-1, and (S,S)-1) were synthesized and assocd. with a second-generation nematic (N) dendron to give fullerodendrimers ((R,S)-2, (R,R)-2, (S,R)-2, and (S,S)-2) which display chiral nematic (N*) phases. The abs. configurations of the stereogenic centers were detd. by X-ray crystallog., 1D and 2D NMR expts., and CD spectroscopy. The liq.-cryst. properties of the fullerodendrimers were studied by polarized optical microscopy (POM) and differential scanning calorimetry (DSC). The fulleropyrrolidine derivs. 2 exhibit supramol. helicoidal organizations with a right-handed helix for the (R,S)-2 and (R,R)-2 diastereoisomers and a left-handed helix for the (S,R)-2 and (S,S)-2 diastereoisomers. This result suggests that the self-organization of such supermol. materials can be controlled at the mol. level by the introduction of only one chiral center. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    Liquid crystal nano-particles, LCNANOP - a SONS II collaborative research project
    (2008)
    Goodby, John W.
    ;
    Bates, Martin
    ;
    Saez, Isabel M.
    ;
    Gorecka, Ewa
    ;
    Kitzerow, Heinz- S.
    ;
    Guillon, Daniel
    ;
    Donnio, B.
    ;
    Serrano, Jose-Luis
    ;
    Deschenaux, Robert 
    A review. LC-NANOP is an ESF EUROCORES SONS Collaborative Research Project that is addressing an innovative approach to self-organized nanostructures by combination of a variety of org., inorg. and metal scaffolds with the unique self-organization properties of liq. crystals to obtain liq. crystal nano-particles. LC-NANOP is concerned with the synthesis, anal., characterization, modeling and physico-chem. properties of super- and supra-mol. systems which are formed from a nano-particle as a central scaffold, surrounded by a layer of liq. crystal. The self-organization properties of the liq. crystal coating is the driving force leading to the self-assembly of the nano-particles into secondary or tertiary hierarchical structures, with emphasis on the systematic variation of nano-particle size, chirality, shape and functionality. This bottom-up approach to nano-structuring is very powerful as it combines the extraordinary variety of morphologies that liq. crystals present with the combination of functional entities, relevant for chem., biol., optoelectronic, and photonic tasks, etc, to create ordered nano-structures that can be controlled by external stimuli. [on SciFinder(R)]
  • Publication
    Accès libre
    An optically-active liquid-crystalline hexa-adduct of [60]fullerene which displays supramolecular helical organization
    (2006)
    Campidelli, Stéphane
    ;
    Brandmüller, Torsten
    ;
    Andreas Hirsch
    ;
    Saez, Isabel M.
    ;
    Goodby, John W.
    ;
    Deschenaux, Robert 
    Polyaddition of mesogenic moieties to C60 were found to yield chiral supermolecular nanoparticles which exhibit iridescent helical chiral nematic phases.
  • Publication
    Accès libre
    Functional polypedes—chiral nematic fullerenes
    (2003)
    Campidelli, Stéphane
    ;
    Eng, Carine
    ;
    Saez, Isabel M.
    ;
    Goodby, John W.
    ;
    Deschenaux, Robert 
    Self-organising, functional materials created by bottom-up synthesis represent important steps forward in the development of novel materials, here we report on the preparation and properties of a chiral nematic tetrapedal liquid crystal that has been functionalised with C60.
  • Publication
    Métadonnées seulement
    Functional polypedes-chiral nematic fullerenes
    (2003)
    Campidelli, Stephane
    ;
    Eng, Carine
    ;
    Saez, Isabel M.
    ;
    Goodby, John W.
    ;
    Deschenaux, Robert 
    Self-organizing, functional materials created by bottom-up synthesis represent important steps forward in the development of novel materials. The authors report on the prepn. and properties of a chiral nematic tetrapedal liq. crystal that was functionalized with C60. [on SciFinder(R)]