Vignette d'image

Deschenaux, Robert

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

Résultat de la recherche

Filtres

8
Réinitialiser les filtres

Paramètres

Voici les éléments 1 - 8 sur 8
  • Publication
    Métadonnées seulement
    [60]fullerene-containing thermotropic liquid crystals
    (: Wiley-VCH Verlag GmbH & Co. KGaA, 2012)
    Guillon, Daniel
    ;
    Donnio, Bertrand
    ;
    Deschenaux, Robert 
    A review. [60]Fullerene-contg. liq. crystals have reached a high degree of sophistication from the point of view of both their structure and mesomorphic properties. Owing to their unique photophys. and electrochem. characteristics, [60]fullerene-based liq. crystals are promising compds. for the development of nanotechnol. by the bottom-up approach. Indeed, good studies have shown that liq.-cryst. fullerenes can play a major role in electron transport and photoconduction, and photoinduced electron and/or energy transfer has been achieved in donor-acceptor dyads when combined with ferrocene, tetrathiafulvalene, or oligophenylenevinylene. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    Liquid-crystalline fullerodendrimers and fullero(codendrimers)
    (: Wiley-VCH Verlag GmbH & Co. KGaA, 2009)
    Guillon, Daniel
    ;
    Donnio, Bertrand
    ;
    Deschenaux, Robert 
    This review highlights with selected examples some relevant results in the field of fullerene-contg. thermotropic liq.-cryst. dendrimers. These examples demonstrate the wide application of dendrimers in designing supramol. fullerene materials. Structures and properties are presented according to the nature of dendrimers and mesogenic units. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    Ferrocene-containing thermotropic liquid crystals
    (: John Wiley & Sons Ltd., 2008)
    Deschenaux, Robert 
    A review. Liq.-cryst. ferrocenes with planar chirality are discussed, along with ferrocene-contg. side-chain liq.-cryst. polymers, redox-active liq.-cryst. ferrocenes, ferrocene-contg. liq.-cryst. dendrimers, and liq.-cryst. ferrocene-fullerene dyads. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    Synthesis of dendrimer-carbon nanotube conjugates
    (: Wiley-V C H Verlag Gmbh, 2007)
    Garcia, A
    ;
    Herrero, M A
    ;
    Frein, Stéphane
    ;
    Deschenaux, Robert 
    ;
    Munoz, R
    ;
    Bustero, I
    ;
    Toma, F
    ;
    Prato, Maurizio
    We describe, the coupling between Carbon Nanotubes (CNTs) and a second-generation cyanophenyl-based dendrimer. The goal of our work is the synthesis of highly functionalized CNTs without provoking damage to the conjugated pi-system. One approach is the attachment of dendrimers with a high density of functional groups to the CNTs. These groups serve as anchor points for further reactions. With this aim, we have carried out a primary modification on CNTs by the use of 1,3 dipolar cycloaddition reaction. We have employed Single Wall Carbon Nanotubes (SWNTs) as well as Multi Wall Carbon Nanotubes (MWNTs) obtaining 238 mu mol and 511 mu mol of pyrrolidine groups per gram, respectively. The amount of amino groups introduced in the system was measured by the Kaiser test as well as thermogravimetric analyses. As a second step, dendrimer incorporation was performed by carbodiimide chemistry. Thermogravimetric Analysis, Raman Spectroscopy and Atomic Force Microscopy characterization techniques are reported for the characterization of the final CNT-dendrimer conjugate. The results show that the dendrimer has been attached covalently to the previously generated amine groups. Morphologically, the attached dendrimer with an estimated theoretical molecular length of 6.4 nm, generates a wrapping of 8 nm thick around the CNTs walls. [GRAPHICS] Scheme of the synthesized CNT-dendrimer conjugate. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
  • Publication
    Métadonnées seulement
    Dendritic liquid-crystalline fullerene-ferrocene dyads
    (: Molecular Diversity Preservation International, 2005)
    Campidelli, Stephane
    ;
    Perez, Laura
    ;
    Rodriguez-Lopez, Julian
    ;
    Barbera, Joaquin
    ;
    Langa, Fernando
    ;
    Deschenaux, Robert 
    First- and second-generation ferrocene-based dendrimers, fullerene and a second-generation liq.-cryst. poly(aryl ester) dendrimer carrying four cyanobiphenyl units were assembled to elaborate polyfunctional materials displaying mesomorphic and electronic properties. The targeted compds. gave rise to enantiotropic smectic A phases and organized into bilayer structures within the smectic layers. Cyclic voltammetry investigations revealed oxidn. and redn. processes in agreement with the presence of both ferrocene and fullerene units. Finally, strong quenching of the fluorescence was obtained for the fullerene-ferrocene dyads suggesting efficient electron transfer from the ferrocene-based dendrimer to fullerene. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    Electro-optical behavior of fullerene-containing liquid-crystalline dendrimers in solutions
    (: American Chemical Society, 2003)
    Yevlampieva, Natalia P.
    ;
    Lavrenko, Peter
    ;
    Dardel, Blaise
    ;
    Deschenaux, Robert 
    The synthesis of multifunctional materials performed by multicomponent single mols. of special chem. architecture is one of the modern trends in materials science. In the present work, malonate dendrimers have been used as matrix mols. for the synthesis of novel liq. cryst. (LC) materials with covalently linked fullerene C60 as addnl. functional component. Two purposes have been realized in the mol. design of novel LCs: 1) combination of typical mesogene compds. as the end groups with dendritic structure of the matrix mol., and 2) incorporation of fullerene to LC mols. Electrooptical Kerr effect and hydrodynamic methods have been utilized to study the dendritic samples with a variable fullerene position for examg. the influence of fullerene on the mol. properties of the original LC dendrimers. It was detected that substituted fullerene C60 reinforces the electrooptical effect of LC dendrimers and only slightly changes their size and mobility in soln. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    Switchable liquid-crystalline polymers and dendrimers based on the ferrocene-ferrocenium redox system
    (: American Chemical Society, 2002)
    Deschenaux, Robert 
    We have recently demonstrated that electron transfer can be used in the ferrocene-ferrocenium redox couple to generate liq.-cryst. properties and to tune the liq.-cryst. organization. Such a behavior is of interest for the development of mol. switches. The concept is based on the fact that different intermol. interactions take place between the ferrocene units (neutral species) or the ferrocenium units (charged species). The ferrocene-based materials were oxidized with silver tosylate or silver dodecylsulfate. In case of the ferrocenium-contg. liq. crystals, the counter-anion had an influence on the thermal and liq.-cryst. properties. Therefore, the mol. organization within the liq.-cryst. assemblies could also be tuned as a function of the nature and structure of the counter-anion. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    Ferrocene-containing thermotropic liquid crystals
    (: VCH, 1995)
    Deschenaux, Robert 
    ;
    Goodby, John W.
    A review, with 29 refs. [on SciFinder(R)]