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Université de Neuchâtel

Influence of a Mesogenic Dendrimer on the Morphology of Polymer–Fullerene Composites for Photovoltaics

Kasdorf, Olga ; Kitzerow, Heinz-Siegfried ; Lenoble-Zwahlen, Julie ; Deschenaux, Robert

In: Japanese Journal of Applied Physics, 2010, vol. 49, no. 1S, p. 01AF01 1-4

The efficiency of "bulk hetero junction"-type plastic solar cells depends crucially on the morphology of an entangled network of two immiscible compounds that serve as electron donor and electron acceptor, respectively. The present work describes preliminary results about the question how the luminescence and the morphology of a composite containing a fullerene C60 derivative and a...

Université de Neuchâtel

Switchable Mesomorphic Materials Based on the Ferrocene−Ferrocenium Redox System: Electron-Transfer-Generated Columnar Liquid-Crystalline Phases

Deschenaux, Robert ; Vilches, Maria-Teresa ; Schweissguth, Martin ; Levelut, Anne-Marie ; Long, Gary J. ; Hautot, Dimitri ; Luneau, Dominique

In: Organometallics, 1999, vol. 18, no. 26, p. 5553–5559

Oxidation of the non-mesomorphic ferrocene derivative 1 with silver toluene-4-sulfonate gave the ferrocenium derivative 2, which showed a monotropic columnar phase. The latter two-dimensional phase is composed of ribbons, in which derivative 2 is organized into bilayers, and has a centered rectangular symmetry with a = 318.3 Å and c = 94.9 Å. The Mössbauer...

Université de Neuchâtel

A Ferrocene-Containing Carbohydrate Surfactant: Thermotropic and Lyotropic Phase Behavior

Donnio, Bertrand ; Seddon, John M. ; Deschenaux, Robert

In: Organometallics, 2000, vol. 19, no. 16, p. 3077–3081

A ferrocene-containing carbohydrate surfactant has been synthesized and shown by polarized optical microscopy, differential scanning calorimetry, and X-ray diffraction to exhibit both thermotropic and lyotropic liquid-crystalline phase behavior. This new class of materials should prove useful for the design of redox-active lyotropic liquid crystals, allowing fine electrochemical control of the...

Université de Neuchâtel

Organized Molecular Films from New Ferrocene-Containing Molecular Units

Deschenaux, Robert ; Megert, Sonia ; Zumbrunn, Cornélia ; Ketterer, Jurgen ; Steiger, Rolf

In: Langmuir, 1997, vol. 13, no. 8, p. 2363–2372

The design and synthesis of new amphiphilic ferrocene derivatives and their capability for forming Langmuir and Langmuir−Blodgett films are reported. The film formation at the air−water interface was followed by surface pressure−molecular area isotherm, surface potential−molecular area isotherm, and Brewster angle microscopy. The stability and structure of the transferred films were...

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

Ferrocene-Containing Thermotropic Side-Chain Liquid-Crystalline Polymethacrylate from a Mesomorphic Trisubstituted Ferrocene Monomer

Deschenaux, Robert ; Guillon, Daniel

In: Macromolecules, 1997, vol. 30, no. 13, p. 3759–3765

The synthesis and mesomorphic properties of a methacrylate-containing ferrocene monomer bearing two flexible chains at the 1,1‘-positions and the corresponding side-chain homopolymer are described. Both polymer and monomer showed enantiotropic smectic C and smectic A phases. The liquid-crystalline phases were fully characterized by means of X-ray diffraction experiments. Dilatometric...

Université de Neuchâtel

Synthesis, Characterization, and Mesomorphic Properties of a Mixed [60]Fullerene−Ferrocene Liquid-Crystalline Dendrimer

Dardel, Blaise ; Deschenaux, Robert ; Even, Michael ; Serrano, Elisabeth

In: Macromolecules, 1999, vol. 32, no. 16, p. 5193-5198

Addition reaction of the malonate-based second-generation ferrocene-containing liquid-crystalline dendrimer 16 to [60]fullerene led to the title compound 1. Molecule 1 showed good solubility in common organic solvents and good thermal stability. Examination of its mesomorphic properties revealed the presence of an enantiotropic smectic A phase, which was identified by...

Université de Neuchâtel

Supramolecular Fullerene Materials: Dendritic Liquid-Crystalline Fulleropyrrolidines

Campidelli, Stéphane ; Lenoble, Julie ; Barberá, Joaquín ; Paolucci, Francesco ; Marcaccio, Massimo ; Paolucci, Demis ; Deschenaux, Robert

In: Macromolecules, 2005, vol. 38, no. 19, p. 7915–7925

[60]Fullerene-containing liquid-crystalline dendrimers were synthesized from the first to the fourth generation by applying the 1,3-dipolar cycloaddition reaction from a mesomorphic dendritic-type aldehyde derivative, sarcosine (N-methylglycine) or glycine and C60. The cyanobiphenyl unit was used as a liquid-crystalline promoter. With the exception of the first-generation...

Université de Neuchâtel

Polar and Electrooptical Properties of [60]Fullerene-Containing Poly(benzyl ether) Dendrimers in Solution

Scanu, David ; Yevlampieva, Natalia P. ; Deschenaux, Robert

In: Macromolecules, 2007, vol. 40, no. 4, p. 1133–1139

[60]Fulleropyrrolidine-containing poly(benzyl ether) dendrimers 1−4 were synthesized via 1,3-dipolar cycloaddition of amino acid and aldehyde derivatives and [60]fullerene. Their dielectric and electrooptical (Kerr effect) solution properties were studied and compared with poly(propyleneimine) dendrimers, namely DAB-dendr-(alkyl chain)n and...

Université de Neuchâtel

Liquid-Crystalline Bisadducts of [60]Fullerene

Campidelli, Stéphane ; Vázquez, Ester ; Milic, Dragana ; Lenoble, Julie ; Atienza Castellanos, Carmen ; Sarova, Ginka ; Guldi, Dirk M. ; Deschenaux, Robert ; Prato, Maurizio

In: The Journal of Organic Chemistry (JOC), 2006, vol. 71, no. 20, p. 7603–7610

A second-generation cyanobiphenyl-based dendrimer was used as a liquid-crystalline promoter to synthesize mesomorphic bisadducts of [60]fullerene. Liquid-crystalline trans-2, trans-3, and equatorial bisadducts were obtained by condensation of the liquid-crystalline promoter, which carries a carboxylic acid function, with the corresponding bisaminofullerene derivatives. A monoadduct...