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Université de Neuchâtel

[60]Fullerene-based liquid crystals acting as acid-sensitive fluorescent probes

Pérez, Laura ; Lenoble, Julie ; Barberá, Joaquín ; de la Cruz, Pilar ; Deschenaux, Robert ; Langa, Fernando

In: Chemical Communications (ChemComm), 2008, vol. 38, p. 4590-4592

Functionalization of [60]fullerene with liquid-crystalline dendrimers and a dibutylaniline-based phenylenevinylene moiety leads to supramolecular materials, the fluorescence of which responds to acid–base stimuli.

Université de Neuchâtel

Accordion-optimized DEPT experiments

Furrer, Julien ; Guerra, Sebastiano ; Deschenaux, Robert

In: Magnetic Resonance in Chemistry, 2011, vol. 49, no. 1, p. 16-22

In this contribution, a pulse sequence is described for recording accordion-optimized DEPT experiments. The proposed ACCORDEPT experiment detects a wide range of one-bond coupling constants using accordion optimization. As a proof of concept, this strategy has been applied to a mesogen containing a large range of one-bond 1JCH coupling constants associated with the various...

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

Aromatic Bent-Core Liquid Crystals: an Opportunity for Introducing Terdentate Binding Units into Mesophases

Nozary, Homayoun ; Piguet, Claude ; Rivera, Jean-Pierre ; Tissot, Paul ; Morgantini, Pierre-Yves ; Weber, Jacques ; Bernardinelli, Gérald ; Bünzli, Jean-Claude G. ; Deschenaux, Robert ; Donnio, Bertrand ; Guillon, Daniel

In: Chemistry of Materials, 2012, vol. 14, no. 3, p. 1075–1090

Lipophilic linear semirigid side arms containing two or three successive phenyl rings separated by carboxylate spacers have been connected to the 5 or 6 positions of bent aromatic terdentate 2,6-bis(benzimidazol-2-yl)pyridine binding units to give extended V-shaped (L11) and I-shaped receptors (L12, L12b, and L13). The carboxylate spacers limit the flexibility of the...

Université de Neuchâtel

Bent Tridentate Receptors in Calamitic Mesophases with Predetermined Photophysical Properties: New Luminescent Lanthanide-Containing Materials

Nozary, Homayoun ; Piguet, Claude ; Tissot, Paul ; Bernardinelli, Gérald ; Bünzli, Jean-Claude G. ; Deschenaux, Robert ; Guillon, Daniel

In: Journal of the American Chemical Society (JACS), 1998, vol. 120, no. 47, p. 12274–12288

A new synthetic strategy has been developed to introduce bent and rigid tridentate 2,6-bis(benzimidazol-2‘-yl)pyridine cores into rodlike ligands L11-17. The crystal structure of the nonmesogenic ligand L13 (C39H37N5O4, triclinic, P1̄, Z = 2) shows the expected trans−trans conformation of the tridentate...

Université de Neuchâtel

Building liquid crystals from the 5-fold symmetrical pillar[5]arene core

Nierengarten, Iwona ; Guerra, Sebastiano ; Holler, Michel ; Nierengarten, Jean-Francois ; Deschenaux, Robert

In: Chemical Communications, 2012, vol. 48, no. 65, p. 8072-8074

Comparison of the liquid-crystalline properties of a pillar[5]arene core functionalized with 10 mesogenic cyanobiphenyl units with those of a corresponding model compound revealed the strong influence of the macrocyclic pillar[5]arene core on the mesomorphic properties.

Université de Neuchâtel

Calamitic liquid crystals containing metal–metal bonds : design of mesomorphic materials based on the Ru2(CO)4(µ-η2-O2CR)2L2 sawhorse unit

Deschenaux, Robert ; Donnio, Bertrand ; Rheinwald, Gerd ; Stauffer, Frédéric ; Süss-Fink, Georg ; Velker, Jörg

In: Journal of the Chemical Society, Dalton Transactions, 1997, p. 4351-4355

A series of complexes based on the stable [Ru2(CO)4(µ-η2-O2CR)2L2] sawhorse unit has been prepared and characterized. The derivatives...

Université de Neuchâtel

Columnar Phases from Covalent and Hydrogen-Bonded Liquid-Crystalline Ferrocene Derivatives

Deschenaux, Robert ; Monnet, Florence ; Serrano, Elisabeth ; Turpin, François ; Levelut, Anne-Marie

In: Helvetica Chimica Acta, 1998, vol. 81, no. 11, p. 2072-2077

The synthesis and liquid-crystalline properties of tetracatenar covalent and H-bonded bis-ferrocene derivatives 1 and 2, respectively, are reported. Both compounds gave rise to enantiotropic columnar liquid-crystalline behavior with a hexagonal molecular organization. To explore the possibility to obtain also calamitic liquid-crystalline phases from H-bonded ferrocene-containing liquid crystals,...

Université de Neuchâtel

Combining coordination and hydrogen-bonds to form arene ruthenium metalla-assemblies

Appavoo, Divembal ; Carnevale, Diego ; Deschenaux, Robert ; Therrien, Bruno

In: Journal of Organometallic Chemistry, 2016, vol. 824, p. 80-87

Three ureido-pyrimidone derivatives (N-LH) were used to generate in combination with four dinuclear arene ruthenium clips, (p-cymene) 2Ru2(OO boolean AND OO)Cl2 (OO boolean AND OO = oxalato, 2,5-dioxido-1,4-benzoquinonato, 2,5-dichloro-1,4-benzoquinonato, 5,8-dioxido-1,4-naphtoquinonato), twelve cationic arene ruthenium metalla-cycles of the...

Université de Neuchâtel

A dendritic fullerene–porphyrin dyad

Campidelli, Stéphane ; Deschenaux, Robert ; Swartz, Angela ; Rahman, G. M. Aminur ; Guldi, Dirk M. ; Milic, Dragana ; Vázquez, Ester ; Prato, Maurizio

In: Photochemical & Photobiological Sciences, 2006, vol. 5, no. 12, p. 1137-1141

We describe the synthesis, characterization and photophysical properties of a fullerene derivative whose structure includes a Zn-porphyrin and a second generation liquid-crystalline (LC) dendrimer. The size of the fullerene and porphyrin units with respect to the size of the LC dendrimer prevents the formation of liquid-crystalline phases. However, this system gives interesting photoinduced...