Université de Neuchâtel

Design, mesomorphic properties, and supramolecular organization of [60]fullerene-containing thermotropic liquid crystals

Chuard, Thierry ; Deschenaux, Robert

In: Journal of Materials Chemistry, 2002, vol. 12, no. 7, p. 1944-1951

Two concepts have been developed for the design of [60]fullerene-containing thermotropic liquid crystals, namely, the covalent and non-covalent concepts. In the covalent approach, C60 was functionalized with liquid-crystalline addends (malonate and aldehyde derivatives) by applying either the Bingel reaction or the 1,3-dipolar cycloaddition reaction. In the non-covalent approach, a...

Université de Neuchâtel

Electrochemical properties of a liquid-crystalline mixed fullerene–ferrocene material and related species

Carano, Maurizio ; Chuard, Thierry ; Deschenaux, Robert ; Even, Michael ; Marcaccio, Massimo ; Paolucci, Francesco ; Prato, Maurizio ; Roffia, Sergio

In: Journal of Materials Chemistry, 2002, vol. 12, no. 4, p. 829-833

The electrochemical properties of a fullerene–ferrocene liquid crystal are reported. The electrochemical study was carried out under strictly aprotic conditions: a total of seven reduction peaks were detected in the negative potential region, and two oxidation peaks in the positive potential one. Comparison of the data with those obtained from suitable model compounds (i.e., analogous...

Université de Neuchâtel

Amphiphilic Fullerene-Cholesterol Derivatives: Synthesis and Preparation of Langmuir and Langmuir-Blodgett Films

Felder, Delphine ; Carreón, Maria del Pilar ; Gallani, Jean-Louis ; Guillon, Daniel ; Nierengarten, Jean-François ; Chuard, Thierry ; Deschenaux, Robert

In: Helvetica Chimica Acta, 2001, vol. 84, no. 5, p. 1119-1132

Amphiphilic fullerene bis-adducts 11 and 14 containing two and four cholesterol moieties, respectively, were prepared starting from the corresponding bis-malonate derivatives. In a systematic study, their spreading behavior at the air-water interface was compared to that of bis-adduct 6 with no polar head-group. Compared to 6, for which some three-dimensional...

Université de Neuchâtel

First Fullerene[60]-Containing Thermotropic Liquid Crystal. Preliminary Communication

Chuard, Thierry ; Deschenaux, Robert

In: Helvetica Chimica Acta, 1996, vol. 79, no. 3, p. 736-741

The synthesis and liquid-crystalline and thermal properties of a fullerene[60] functionalized by a framework containing two cholesterol derivatives through a methanofullerene structure are reported. The targeted fullerene derivative showed high thermal stability.

Université de Neuchâtel

Planar chirality: a fascinating symmetry breaking which leads to ferroelectricity in ferrocenyl liquid crystals

Chuard, Thierry ; Cowling Stephen J. ; Fernandez-Ciurleo, Maria ; Jauslin, Isabelle ; Goodby, John W. ; Deschenaux, Robert

In: Chemical Communications (ChemComm), 2000, vol. 21, p. 2109-2110

We describe the synthesis, characterization and properties of the first optically-active 1,3-unsymmetrically disubstituted ferrocene derivative which is to exhibit smectic C* and smectic A* phases.

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.