Université de Neuchâtel

Ferrocene-Containing Thermotropic Side-Chain Liquid-Crystalline Polysiloxanes

Deschenaux, Robert ; Jauslin, Isabelle ; Scholten, Ulrich ; Turpin, François ; Guillon, Daniel ; Heinrich, Benoît

In: Macromolecules, 1998, vol. 31, no. 17, p. 5647–5654

The synthesis, purification, characterization, and liquid-crystalline properties of side-chain polysiloxanes bearing mesomorphic 1,1‘- or 1,3-disubstituted ferrocene units are reported. The polymers were prepared by grafting the appropriate vinyl-containing ferrocene monomer onto commercially available poly(hydrosiloxane)s following a standard procedure. The monomers gave smectic A or smectic A...

Université de Neuchâtel

Olefin Cross-Metathesis: a Versatile Synthetic Reaction for the Design of Janus Liquid Crystals

Trinh, Thi Minh Nguyet ; Nguyen, Thanh Tung ; Kopp, Cyril ; Pieper, Pauline ; Russo, Virginie ; Heinrich, Benoît ; Donnio, Bertrand ; Nguyen, Thi Le Anh ; Deschenaux, Robert

In: European Journal of Organic Chemistry, 2015, vol. 2015, no. 27, p. 6005-6010

The olefin cross-metathesis reaction using the second-generation Grubbs catalyst was employed to prepare non-symmetrical thermotropic liquid crystals from various mesomorphic or nonmesomorphic type I and type II olefinic constructs, including linear, chiral, dendritic and ferrocenyl olefins. Smectic C, smectic A and nematic phases, as well as chiral smectic A and chiral nematic phases were...

Université de Neuchâtel

Design, Synthesis, and Self-Assembly Behavior of Liquid-Crystalline Bis-[60]Fullerodendrimers

Russo, Virginie ; Pieper, Pauline ; Heinrich, Benoît ; Donnio, Bertrand ; Deschenaux, Robert

In: Chemistry – A European Journal, 2016, vol. 22, no. 48, p. 17366-17376

Bis-[60]fullerodendrimers were synthesized by assembling [60]fullerene-containing type I (terminal olefin) and type II (a,ß-unsaturated carbonyl olefin) olefins through the olefin cross-metathesis reaction. The synthetic modular approach developed in this study allowed the preparation of mono-[60]fullerodendrimers and their [60]fullerene-free analogues. First- and second-generation poly(aryl...

Université de Neuchâtel

Designing Supramolecular Liquid-Crystalline Hybrids from Pyrenyl-Containing Dendrimers and Arene Ruthenium Metallacycles

Pitto-Barry, Anaïs ; Barry, Nicolas P. E ; Russo, Virginie ; Heinrich, Benoît ; Donnio, Bertrand ; Therrien, Bruno ; Deschenaux, Robert

In: Journal of the American Chemical Society, 2014, vol. 136, no. 50, p. 17616-17625

The association of the arene ruthenium metallacycle [Ru4(p- cymene)4(bpe)2(donq)2][DOS]4 (bpe = 1,2- bis(4-pyridyl)ethylene, donq = 5,8-dioxydo-1,4-naphtoquinonato, DOS = dodecyl sulfate) with pyrenyl-functionalized poly(arylester) dendrimers bearing cyanobiphenyl end- groups is reported. The supramolecular dendritic systems display...

Université de Fribourg

Influence of linear and branched perfluoroalkylated side chains on the π–π stacking behaviour of hexa-peri-hexabenzocoronene and thermotropic properties

Alameddine, Bassam ; Aebischer, Olivier Frédéric ; Heinrich, Benoît ; Guillon, Daniel ; Donnio, Bertrand ; Jenny, Titus A.

In: Supramolecular Chemistry, 2014, vol. 26, no. 2, p. 125–137

The thermotropic properties and self-assembly of two different series of hexa-peri-hexabenzocoronenes (HBC) bearing either linear or branched perfluoroalkylated side chains, each with a wide range of alkyl spacer and perfluorinated tail lengths, have been studied. Correlations between thermogravimetric analysis, differential scanning calorimetry, polarised optical microscopy and small-angle X-ray...

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

Fullerene-containing liquid-crystalline dendrimers

Dardel, Blaise ; Guillon, Daniel ; Heinrich, Benoît ; Deschenaux, Robert

In: Journal of Materials Chemistry, 2001, vol. 11, p. 2814 - 2831

Addition reaction of mesomorphic malonate-based dendrimers (up to the fourth generation) with C60 gave liquid-crystalline fullerene derivatives. The cyanobiphenyl unit was used as liquid-crystalline promoter. The malonates presented nematic and/or smectic A phases. The fullerenes showed only smectic A phases, with the exception of the second generation dendrimer for which smectic A and...