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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

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

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...

Université de Neuchâtel

Liquid-Crystalline Fullerodendrimers which Display Columnar Phases

Lenoble, Julie ; Maringa, Natacha ; Campidelli, Stéphane ; Donnio, Bertrand ; Guillon, Daniel ; Deschenaux, Robert

In: Organic Letters, 2006, vol. 8, no. 9, p. 1851–1854

The title compounds were synthesized by applying the 1,3-dipolar cycloaddition reaction of aldehyde-based poly(benzyl ether) dendrimers and sarcosine (N-methylglycine) to [60]fullerene (C60). The dendritic building blocks used to functionalize C60 displayed cubic and hexagonal columnar phases. The fullerene derivatives showed rectangular columnar phases of c2mm...

Université de Neuchâtel

Liquid-Crystalline [60]Fullerene-TTF Dyads

Allard, Emmanuel ; Oswald, Frédéric ; Donnio, Bertrand ; Guillon, Daniel ; Delgado, Juan Luis ; Langa, Fernando ; Deschenaux, Robert

In: Organic Letters, 2005, vol. 7, no. 3, p. 383-386

[60]Fullerene was functionalized with a TTF derivative and a bis-mesogenic fragment. The synthetic methodology was based on the addition of a malonate derivative to C60 (Bingel-type reaction). Both the malonate and dyad showed smectic B and A phases. The supramolecular organization within the smectic layers was of the monolayer type for the malonate and of the bilayer type for the...

Université de Neuchâtel

Supramolecular Metallomesogens: Hydrogen-Bonded Ferrocene-Containing Liquid Crystals Which Display Bicontinuous Cubic Phases

Massiot, Philippe ; Impéror-Clerc, Marianne ; Veber, Michèle ; Deschenaux, Robert

In: Chemistry of Materials, 2005, vol. 17, no. 8, p. 1946–1951

Two series of hydrogen-bonded liquid-crystalline ferrocenes have been prepared by reacting ferrocene derivatives carrying a carboxylic acid function and two flexible alkyl chains (containing n = 8, 10, or 12 carbon atoms) with stilbazoles bearing a flexible alkyl chain (containing m = 6 or 10 carbon atoms). The first family of materials (m = 6; n = 8, 10, 12) gave rise...

Université de Neuchâtel

Mesomorphic Hexabenzocoronenes Bearing Perfluorinated Chains

Alameddine, Bassam ; Aebischer, Olivier F. ; Amrein, Walter ; Donnio, Bertrand ; Deschenaux, Robert ; Guillon, Daniel ; Savary, Corinne ; Scanu, David ; Scheidegger, Oliver ; Titus A. , Jenny

In: Chemistry of Materials, 2005, vol. 17, no. 19, p. 4798–4807

Synthesis and characterization of new hexabenzocoronene (HBC) derivatives bearing perfluoroalkylated chains are described. These disc-shaped polycondensed aromatic hydrocarbons are known to self-assemble by π-stacking into columnar architectures. The peripheral decoration with perfluorinated chains, well-known for their low van der Waals forces, leads as expected to reduced intercolumnar...