Université de Neuchâtel

Olefin Cross-Metathesis: a Versatile Synthetic Reaction for the Design of Janus Liquid Crystals

Trinh, Thi Minh Nguyet ; Nguyen, Thanh Tung ; Kopp, Cyril ; Pieper, Pauline ; Russo, Virginie ; Heinrich, Benoît ; Donnio, Bertrand ; Nguyen, Thi Le Anh ; Deschenaux, Robert

In: European Journal of Organic Chemistry, 2015, vol. 2015, no. 27, p. 6005-6010

The olefin cross-metathesis reaction using the second-generation Grubbs catalyst was employed to prepare non-symmetrical thermotropic liquid crystals from various mesomorphic or nonmesomorphic type I and type II olefinic constructs, including linear, chiral, dendritic and ferrocenyl olefins. Smectic C, smectic A and nematic phases, as well as chiral smectic A and chiral nematic phases were...

Université de Neuchâtel

Liquid-crystalline fullerene-gold nanoparticles

Nguyen, Thanh Tung ; Albert, Steeve ; Nguyen, Thi Le Anh ; Deschenaux, Robert

In: RSC Advances, 2015, vol. 5, no. 35, p. 27224-27228

We report the design, synthesis and properties of the title compounds which were prepared via click chemistry from azide-containing gold nanoparticles and mesomorphic alkyne-functionalized [60]fullerene ligands. The material displays the smectic A phase and shows a good thermal stability.

Université de Neuchâtel

Designing liquid-crystalline gold nanoparticles via the olefin cross-metathesis reaction

Nguyen, Thanh Tung ; Nguyen, Thi Le Anh ; Deschenaux, Robert

In: Journal of Porphyrins and Phthalocyanines, 2016, vol. 20, no. 08n11, p. 1060-1064

Liquid-crystalline gold nanoparticles were prepared by grafting mesomorphic α,β- unsaturated carbonyl olefins onto the organic shell of gold nanoparticles containing terminal olefin ligands by applying the olefin cross-metathesis. The latter reaction was performed under standard conditions using second-generation Grubbs catalyst. The title materials were found to be stable up to 200 °C and...

Université de Neuchâtel

Liquid-Crystalline Dendrimers Designed by Click Chemistry

Guerra, Sebastiano ; Nguyen, Thi Le Anh ; Furrer, Julien ; Nierengarten, Jean-François ; Barberá, Joaquín ; Deschenaux, Robert

In: Macromolecules, 2016, vol. 49, no. 9, p. 3222-3231

Liquid-crystalline dendrimers have been prepared from second-generation Percec- type poly(benzyl ether) dendrons or second-generation poly(aryl ester) dendrons carrying cyanobiphenyl mesogens. The Janus dendrimer, which combines the two types of dendromesogens, has also been synthesized. Those compounds have been prepared under copper-catalyzed azide–alkyne cycloaddition conditions. The ...