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Université de Neuchâtel

[60]Fullerene-based liquid crystals acting as acid-sensitive fluorescent probes

Pérez, Laura ; Lenoble, Julie ; Barberá, Joaquín ; de la Cruz, Pilar ; Deschenaux, Robert ; Langa, Fernando

In: Chemical Communications (ChemComm), 2008, vol. 38, p. 4590-4592

Functionalization 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.

Université de Neuchâtel

A Mixed Fullerene-Ferrocene Thermotropic Liquid Crystal: Synthesis, Liquid-Crystalline Properties, Supramolecular Organization and Photoinduced Electron Transfer

Even, Michaël ; Heinrich, Benoît ; Guillon, Daniel ; Guldi, Dirk M. ; Prato, Maurizio ; Deschenaux, Robert

In: Chemistry - A European Journal, 2001, vol. 7, no. 12, p. 2595-2604

Grafting of a ferrocene-containing liquid-crystalline malonate derivative to C60 led to the mixed fullerene-ferrocene material 1 which gave rise to a smectic A phase. Cholesterol was used as liquid-crystalline promoter. X-ray diffraction experiments and volumetric measurements indicated that 1 is organized in double layered structures. The corresponding supramolecular...

Université de Neuchâtel

Synthesis of dendrimer-carbon nanotube conjugates

García, A. ; Herrero, M. A. ; Frein, Stéphane ; Deschenaux, Robert ; Muñoz. R. ; Bustero, I. ; Toma, F. ; Prato, Maurizio

In: Physica Status Solidi (a), 2008, vol. 205, no. 6, p. 1402-1407

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 π-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...

Université de Neuchâtel

Liquid-Crystalline Thiol- and Disulfide-Based Dendrimers for the Functionalization of Gold Nanoparticles

Frein, Stéphane ; Boudon, Julien ; Vonlanthen, Mireille ; Scharf, Toral ; Barberá, Joaquín ; Süss-Fink, Georg ; Bürgi, Thomas ; Deschenaux, Robert

In: Helvetica Chimica Acta, 2008, vol. 91, no. 12, p. 2321-2337

Liquid-crystalline dendrons carrying either a thiol or disulfide function which display nematic, smectic A, columnar, or chiral nematic phases have been synthesized. Their mesomorphic properties are in agreement with the nature of the mesogenic units and structure of the dendrons. The first-generation poly(aryl ester) dendron containing two cyanobiphenyl mesogenic units was used to functionalize...

Université de Neuchâtel

An optically-active liquid-crystalline hexa-adduct of [60]fullerene which displays supramolecular helical organization

Campidelli, Stéphane ; Brandmüller, Torsten ; Hirsch, Andreas ; Saez, Isabel M. ; Goodby, John W. ; Deschenaux, Robert

In: Chemical Communications, 2006, vol. 41, p. 4282 - 4284

Polyaddition of mesogenic moieties to C60 were found to yield chiral supermolecular nanoparticles which exhibit iridescent helical chiral nematic phases.

Université de Neuchâtel

Liquid-crystalline fullerene–ferrocene dyads

Campidelli, Stéphane ; Vázquez, Ester ; Milic, Dragana ; Prato, Maurizio ; Barberá, Joaquín ; Guldi, Dirk M. ; Marcaccio, Massimo ; Paolucci, Demis ; Paolucci, Francesco ; Deschenaux, Robert

In: Journal of Materials Chemistry, 2004, vol. 14, p. 1266 - 1272

The 1,3-dipolar cycloaddition reaction was used to assemble fullerene, ferrocene and a second-generation liquid-crystalline cyanobiphenyl-based dendrimer. The targeted compound displayed an enantiotropic smectic A phase from 40 to 135 °C. The d-layer spacing was determined by X-ray diffraction, and was found to be independent of temperature with a value of 95 Å. Molecular modeling and...

Université de Neuchâtel

A liquid-crystalline hexa-adduct of [60]fullerene

Chuard, Thierry ; Deschenaux, Robert ; Hirsch, Andreas ; Schönberger, Hubert

In: Chemical Communications, 1999, p. 2103 - 2104

A hexa-adduct of [60]fullerene was synthesized by addition of a mesomorphic twin cyanobiphenyl malonate derivative to C60; whereas the malonate derivative gave a monotropic nematic phase, the fullerene hexa-adduct showed an enantiotropic smectic A phase.

Université de Neuchâtel

Liquid-crystalline fullerene–oligophenylenevinylene conjugates

Campidelli, Stéphane ; Deschenaux, Robert ; Eckert, Jean-François ; Guillon, Daniel ; Nierengarten, Jean-François

In: Chemical Communications, 2002, p. 656 - 657

Functionalization of C60–oligophenylenevinylene derivatives with a cyanobiphenyl-terminated dendromesogen leads to new donor–acceptor systems with liquid-crystalline properties.

Université de Neuchâtel

Functional polypedes—chiral nematic fullerenes

Campidelli, Stéphane ; Eng, Carine ; Saez, Isabel M. ; Goodby, John W. ; Deschenaux, Robert

In: Chemical Communications, 2003, p. 1520-1521

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.

Université de Neuchâtel

Dendritic liquid-crystalline fullerene–ferrocene dyads

Campidelli, Stéphane ; Pérez, Laura ; Rodríguez-López Julián ; Barberá, Joaquín ; Langa, Fernando ; Deschenaux, Robert

In: Tetrahedron, 2006, vol. 62, no. 9, p. 2115-2122

First- and second-generation ferrocene-based dendrimers, fullerene and a second-generation liquid-crystalline poly(arylester) dendrimer carrying four cyanobiphenyl units were assembled to elaborate polyfunctional materials displaying mesomorphic and electronic properties. The targeted compounds gave rise to enantiotropic smectic A phases and organized into bilayer structures within the smectic...