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Deschenaux, Robert
Nom
Deschenaux, Robert
Affiliation principale
Fonction
Professeur.e ordinaire
Email
Robert.Deschenaux@unine.ch
Identifiants
Résultat de la recherche
12 Résultats
Voici les éléments 1 - 10 sur 12
- PublicationAccès libreHighly Fluorescent Liquid-Crystalline Dendrimers Based on Borondipyrromethene Dyes(2009)
- PublicationAccès libreMesomorphic Metallo-Dendrimers Based on the Metal−Metal Bonded Ru2(CO)4 Sawhorse Unit(2008)
; - PublicationAccès libre[60]Fullerene-based liquid crystals acting as acid-sensitive fluorescent probes(2008)
; Langa, FernandoFunctionalization of [60]fullerene with liquid-crystalline dendrimers and a dibutylaniline-based phenylenevinylene moiety leads to supramolecular materials, the fluorescence of which responds to acid–base stimuli. - PublicationAccès libreLiquid-Crystalline Thiol- and Disulfide-Based Dendrimers for the Functionalization of Gold Nanoparticles(2008)
; - PublicationAccès libreDendritic liquid-crystalline fullerene–ferrocene dyads(2006-02-25)
- PublicationAccès libreDendritic liquid-crystalline fullerene–ferrocene dyads(2006)
- PublicationAccès libreSupramolecular Fullerene Materials: Dendritic Liquid-Crystalline Fulleropyrrolidines(2005)
- PublicationAccès libreLiquid-crystalline fullerene–ferrocene dyads(2004)
- PublicationAccès libreMacrocyclic Effects in the Mesomorphic Properties of Liquid-Crystalline Pillar[5]- and Pillar[6]arenes
; ; Nierengarten, Jean-FrançoisWhereas the reaction of 1,4-bis(2-bromoethyloxy)benzene (4) with paraformaldehyde in the presence of BF3·Et2O afforded exclusively the cyclopentameric pillar[5]arene derivative (5), both cyclopenta- and cyclohexameric macrocycles 5 and 6 were obtained when the reaction of 4 with paraformaldehyde was performed at 45 °C in CHCl3 with FeCl3 as the catalyst. Treatment of compounds 4–6 with sodium azide provided the corresponding polyazides, to which a cyanobiphenyl building block was subsequently grafted to generate model compound 1, pillar[5]arene 2, and pillar[6]arene 3, bearing two, ten and twelve mesomorphic subunits, respectively. The liquid-crystalline and thermal properties of the compounds were investigated by polarized optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). Comparison of the liquid-crystalline properties of macrocycles 2 and 3 with those of 1 revealed the strong influence of the macrocyclic pillar[n]arene core on the mesomorphic properties. Whereas only a monotropic mesophase was observed for 1, a broad enantiotropic mesophase was evidenced for both pillar[n]arene derivatives. - PublicationAccès librePiling Up Pillar[5]arenes To Self-Assemble Nanotubes
; ; Nierengarten, Jean-FrançoisNew liquid-crystalline pillar[5]arene derivatives have been prepared by grafting first- generation Percec-type poly(benzylether) dendrons onto the macrocyclic scaffold. The molecules adopt a disc-shaped structure perfectly suited for self-organization into a columnar liquid-crystalline phase. In this way, the pillar[5]arene cores are piled up, thus forming a nanotubular wire encased within a shell of peripheral dendrons. The capability of pillar[5]arenes to form inclusion complexes has been also exploited. Specifically, detailed binding studies have been carried out in solution with 1,6- dicyanohexane as the guest. Inclusion complexes have also been prepared in the solid state. Supramolecular organization into the Colh mesophase has been deduced from X-ray diffraction data and found to be similar to that observed within the crystal lattice of a model inclusion complex prepared from 1,4-dimethoxypillar[5]arene and 1,6- dicyanohexane.