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

Liquid-crystalline methanofullerodendrimers which display columnar mesomorphism

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

In: Journal of Materials Chemistry, 2008, vol. 18, p. 1524-1534

Liquid-crystalline methanofullerodendrimers were synthesized via the Bingel addition reaction of mesomorphic malonate derivatives and C60. Second- and third-generation poly(benzyl ether) dendrons were selected as liquid-crystalline promoters to induce columnar mesomorphism. Based on a convergent and modular synthetic methodology, symmetrical (two identical dendrons) and...

Université de Neuchâtel

Liquid-crystalline mixed [60]fullerene–ferrocene materials

Deschenaux, Robert ; Even, Michael ; Guillon, Daniel

In: Chemical Communications (ChemComm), 1998, vol. 5, p. 537-538

[60]Fullerene was functionalized with a mesomorphic malonate derivative containing two ferrocene units; the targeted compound showed thermotropic liquid-crystalline properties.

Université de Neuchâtel

Encoding calamitic mesomorphism in thermotropic lanthanidomesogens

Terazzi, Emmanuel ; Bocquet, Bernard ; Campidelli, Stéphane ; Donnio, Bertrand ; Guillon, Daniel ; Deschenaux, Robert ; Piguet, Claude

In: Chemical Communications (ChemComm), 2006, vol. 27, p. 2922-2924

Peripheral cyanobiphenyl dendrimers impose a microphase organization compatible with smectic mesomorphism, in which the bulky nine-coordinate lanthanide core is located between the decoupled mesogenic sublayers made up of parallel cyanobiphenyl groups.

Université de Neuchâtel

Liquid-crystalline fullerodendrimers

Deschenaux, Robert ; Donnio, Bertrand ; Guillon, Daniel

In: New Journal of Chemistry (NJC), 2007, vol. 31, no. 7, p. 1064 - 1073

Addition of liquid-crystalline dendrimers onto [60]fullerene led to thermotropic liquid crystals which displayed various types of mesophases, including chiral nematic, smectic B, smectic A and columnar phases. This approach represents an interesting way for the design of self-organized structures based on [60]fullerene, and opens the way to optoelectronic applications for this carbon allotrope,...

Université de Fribourg

Controlling the lateral aggregation of perfluoroalkylated hexa-peri-hexabenzocoronenes

Aebischer, Olivier F. ; Aebischer, Annina ; Donnio, Bertrand ; Alameddine, Bassam ; Dadras, Massoud ; Güdel, Hans-Ulrich ; Guillon, Daniel ; Jenny, Titus A.

The investigation of two hexa-peri-hexabenzocoronene (HBC) derivatives carrying linear or branched perfluoroalkylated side chains is reported. Polycondensed aromatic hydrocarbons (PAH) such as HBC derivatives are well known to self-organize to form highly ordered monomolecular stacks, which in turn show a concentration- and solvent-dependent lateral aggregation. However, possible...

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...

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

Ferrocene-Containing Optically Active Liquid-Crystalline Side-Chain Polysiloxanes with Planar Chirality

Brettar, Julie ; Bürgi, Thomas ; Donnio, Bertrand ; Guillon, Daniel ; Klappert, Rolf ; Scharf, Toral ; Deschenaux, Robert

In: Advanced Functional Materials, 2005, vol. 16, p. 260 - 267

Optically active liquid-crystalline side-chain polysiloxanes have been prepared by grafting planar chiral ferrocene-based vinyl monomers onto commercially available polyhydrosiloxane. Two ferrocene monomers have been synthesized: a linear-type monomer, which displays a monotropic chiral smectic C (SC*) phase and enantiotropic smectic A (SA) and chiral N (N*) phases, and a laterally...

Université de Neuchâtel

Hexacatenar liquid-crystalline complexes of palladium(II) and platinum(II) based on trialkoxystilbazole esters

Plasseraud, Laurent ; Gonzalez Cuervo, Laura ; Guillon, Daniel ; Süss-Fink, Georg ; Deschenaux, Robert ; Bruce, Duncan W. ; Donnio, Bertrand

In: Journal of Materials Chemistry, 2002, vol. 12, p. 2653-2658

The synthesis and characterisation of 4-(3,4,5-trialkoxybenzoyloxy)pyridines (1a–e), and of their corresponding palladium(II), (2a–e), and platinum(II), (3a–e), complexes are described. The pyridine-based ligands are not mesomorphic, but upon complexation to PdCl2 or PtCl2, new hexacatenar mesogens are formed which show exclusively the hexagonal...