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Deschenaux, Robert

Nom
Deschenaux, Robert
Affiliation principale
Fonction
Professeur.e ordinaire
Email
Robert.Deschenaux@unine.ch
Identifiants
https://libra.unine.ch/handle/123456789/384
_
0000-0002-1142-0022

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  • Publication
    Métadonnées seulement
    Ferrocene-containing liquid-crystalline dendrimers
    (2003)
    Chuard, Thierry
    ;
    Beguin, Maria-Teresa
    ;
    Deschenaux, Robert 
    The synthesis and liq.-cryst. properties of two ferrocene-contg. liq.-cryst. dendrimers of second generation were described, which differentiate by the position of the ferrocene unit within the structure and by the nature of the mesomorphic promoters. Both dendrimers gave rise to smectic phases in agreement with their structures. The title compds. were prepd. by applying a convergent synthesis. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    Functional liquid-crystalline materials based on ferrocene
    (2003)
    Chuard, Thierry
    ;
    Deschenaux, Robert 
    A review. Ferrocene is a valuable unit for the elaboration of functional liq.-cryst. materials: (1) its 3-dimensional structure allowed a clear structure-mesomorphic behavior relation in the case of mono-, di-, and poly-substituted ferrocene-contg. liq. crystals to be established, (2) its derivatization at the 1,3-positions by 2 different substituents generated structures with planar chirality, and (3) its redox properties could be used to produce redox-active mesomorphic liq. crystals. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    Amphiphilic fullerene-cholesterol derivatives: synthesis and preparation of Langmuir and Langmuir-Blodgett films
    (2001)
    Felder, Delphine
    ;
    Carreon, Maria Del Pilar
    ;
    Gallani, Jean-Louis
    ;
    Guillon, Daniel
    ;
    Nierengarten, Jean-Francois
    ;
    Chuard, Thierry
    ;
    Deschenaux, Robert 
    Amphiphilic fullerene bis-adducts 11 and 14 contg. two and four cholesterol moieties, resp., were prepd. starting from the corresponding bis-malonate derivs. In a systematic study, their spreading behavior at the air-H2O interface was compared to that of bis-adduct 6 with no polar head-group. Compared to 6, for which some three-dimensional aggregation occurs, the polar head-group in 11 and 14 is responsible for an attractive interaction with the aq. subphase, forcing the mols. towards the H2O surface into a two-dimensional arrangement. Even if homogeneous Langmuir films were obtained with both 11 and 14, only the films of 14 show a reversible compression/expansion behavior. This suggests that, by increasing the no. of cholesterol subunits, the encapsulation of the C-sphere in its addend is more efficient, thus preventing fullerene-fullerene interactions and aggregation phenomena. The Langmuir films of 11 and 14 were also efficiently transferred onto hydrophilic quartz slides, yielding Langmuir-Blodgett films. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    Liquid-crystalline dendrimers based on ferrocene and fullerene
    (2001)
    Chuard, Thierry
    ;
    Deschenaux, Robert 
    The synthesis and liq.-cryst. properties of a 2nd generation ferrocene-contg. liq.-cryst. dendrimer, and the liq.-cryst. behavior of a 2nd generation mixed fullerene-ferrocene liq.-cryst. dendrimer are presented. The electrochem. properties were also studied. Both compds. gave rise to smectic A phases, which were identified by polarized optical microscopy and DSC. The liq.-cryst. behavior is detd. by the cholesterol units which were selected as mesomorphic promoters. Therefore, both compds. display similar liq.-cryst. properties. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    A liquid-crystalline hexa-adduct of [60]fullerene
    (1999)
    Chuard, Thierry
    ;
    Deschenaux, Robert 
    ;
    Hirsch, Andreas
    ;
    Schonberger, Hubert
    A hexa-adduct of [60]fullerene was synthesized by addn. of a mesomorphic twin cyanobiphenyl malonate deriv. to C60; whereas the malonate deriv. gave a monotropic nematic phase, the fullerene hexa-adduct showed an enantiotropic smectic A phase. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    Ferrocene- and fullerene[60]-containing liquid-crystalline materials
    (1998)
    Chuard, Thierry
    ;
    Deschenaux, Robert 
    A review with 22 refs. showing the versatility of ferrocene and fullerene for the design of thermotropic liq.-cryst. materials: (i) the electrochem. properties of the ferrocene-ferrocenium system were exploited to design redox-active metallomesogens; (ii) ferrocene-contg. side-chain liq.-cryst. polysiloxane and polymethacrylates were synthesized by grafting a mesomorphic vinyl-ferrocene monomer onto com. available polysiloxane and by free-radical polymn. of mesomorphic methacrylate-ferrocene monomers, resp.; (iii) a 1st-generation ferrocene-contg. liq.-cryst. dendrimer was synthesized; and (iv) liq.-cryst. fullerene (10) and mixed fullerene-ferrocene (11) derivs. were obtained by functionalizing the C60 core with a twin cholesterol moiety. [on SciFinder(R)]
  • Publication
    Métadonnées seulement
    First fullerene[60]-containing thermotropic liquid crystal
    (1996)
    Chuard, Thierry
    ;
    Deschenaux, Robert 
    The synthesis and liq.-cryst. and thermal properties of C60 functionalized through a methanofullerene structure by a framework contg. 2 cholesterol derivs. are reported. The compd. showed high thermal stability. [on SciFinder(R)]