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

Conception de nanoparticules d’or liquides-cristallines via la chimie click et la métathèse croisée d’oléfines

Nguyen, Thanh Tung ; Deschenaux, Robert (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2016.

Notre travail de thèse consiste à employer deux méthodes de synthèse: la cycloaddition 1,3-dipolaire de Huisgen entre un alcyne et un azoture en présence d’un catalyseur de cuivre (I) (appelée également "chimie click") et la métathèse croisée d’oléfines pour greffer des dendrons liquides-cristallins sur la surface de nanoparticules d’or (AuNPs). Ce travail est divisé en...