Université de Neuchâtel

Conception de matériaux dendritiques chiraux mésomorphes pour l’élaboration de commutateurs électroactifs basés sur le couple ferrocène/ferrocenium

Kopp, Cyril ; Deschenaux, Robert (Dir.) ; Süss-Find, Georg (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2010.

This thesis focuses on the design of new mesomorphic materials. Two chiral dendrimers were synthesized with the aim to transfer their liquid-crystalline properties to ferrocene derivatives. An evolution towards peralkylated ferrocene gave stable ferrocenium derivatives showing a switch between liquid-crystalline phases. The role of the dendritic structure and oxidation could be explained. Then,...

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

Dendritic liquid-crystalline fullerene–ferrocene dyads

Campidelli, Stéphane ; Pérez, Laura ; Rodríguez-López Julián ; Barberá, Joaquín ; Langa, Fernando ; Deschenaux, Robert

In: Tetrahedron, 2006, vol. 62, no. 9, p. 2115-2122

First- and second-generation ferrocene-based dendrimers, fullerene and a second-generation liquid-crystalline poly(arylester) dendrimer carrying four cyanobiphenyl units were assembled to elaborate polyfunctional materials displaying mesomorphic and electronic properties. The targeted compounds gave rise to enantiotropic smectic A phases and organized into bilayer structures within the smectic...