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Université de Neuchâtel

Conception, synthèse et étude de "tris"-fullérodendrimères et rotaxanes liquides-cristallins

Pieper, Pauline ; Deschenaux, Robert (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

The aim of this thesis work is to combine self-organizing liquid-crystalline dendrimers with isotropic components, such as C60 and rotaxane to create complexes supramolecular architectures of interests for optoelectronic applications. This work is intended to rationalize the relation between molecular design and liquid-crystalline properties, with emphasis on the influence of isotropic...

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

Conception de bisfullérodendrimères liquides-cristallins par la réaction de métathèse croisée d'oléfines

Russo, Virginie ; Deschenaux, Robert (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2016.

In this thesis, the topic was the design of liquid-crystalline bisfullerodendrimers. Indeed, the field of liquid-crystalline fullerodendrimers is being extensively investigated. Combining [60]fullerene (C60) with liquid crystal organization give numerous applications in the field of self-assembled supramolecular materials. Currently, the mesomorphic fullerodendrimers are made of only...

Université de Neuchâtel

Propriétés mésomorphes ou biologiques d'assemblages dendritiques et métallodendritiques

Pitto-Barry, Anaïs ; Deschenaux, Robert (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012 ; 2256.

The aim of this thesis is to combine metals and dendrimers to obtain mesomorphic or biological properties. The design of metamaterials from gold nanoparticles is still a challenge as the spatial organisation is difficult to control. Thus, the combination of gold nanoparticles with liquid-crystalline dendrimers is a way to explore the organisation of such systems in mesophases. We...

Université de Neuchâtel

La chimie click au service des cristaux liquides : du concept à l'application

Guerra, Sebastiano ; Deschenaux, Robert (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012 ; 2249.

Our research project deals with the design of liquid-crystalline materials based on the 1,3-dipolar cycloaddition reaction, i.e. the click chemistry. This reaction was found to be effective and versatile, and a great variety of new complex structures could be synthesized, including dendrimers, dendromesogens, gold nanoparticles and polyadducts of fullerenes. In the area of mesomorphic...

Université de Neuchâtel

Double Targeting of Tumours with Pyrenyl-Modified Dendrimers Encapsulated in an Arene–Ruthenium Metallaprism

Pitto-Barry, Anaïs ; Barry, Nicolas P. E. ; Zava, Olivier ; Deschenaux, Robert ; Dyson, Paul J. ; Therrien, Bruno

In: Chemistry – A European Journal, 2011, vol. 17, no. 6, p. 1966-1971

The self-assembly of 2,4,6-tris(pyridin-4-yl)-1,3,5-triazine (tpt) triangular panels with p-cymene–ruthenium building blocks and 5,8-dioxido-1,4-naphthoquinonato (donq) bridges, in the presence of pyrenyl-containing dendrimers of different generations (P0, P1 and P2), affords the triangular prismatic host–guest compounds...

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

Conception de dendrimères liquides-cristallins pour la fonctionnalisation de nanoparticules d'or et de composés inorganiques et organiques

Frein, Stéphane ; Deschenaux, Robert (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2009 ; Th. 2118.

The main objective of the thesis is the design of liquid-crystalline dendrimers for the functionalization of various organic and organometallic moieties including gold nanoparticles, fullerene, diruthenium clusters, fluorescent dyes and carbon nanotubes. Three different families of dendrimers were prepared: poly(aryl ester) dendrimers functionalized with cyanobiphenyl mesogenic units (smectic and...

Université de Fribourg

a new level of hierarchical structure control by use of supramolecular self-assembled dendronized block copolymers

Li, Chaoxu ; Schlüter, Dieter A. ; Zhang, Afang ; Mezzenga, Raffaele

In: Advanced Materials, 2008, vol. 20, no. 23, p. 4530 - 4534

Complexation of dendronized block copolymers with sulfate alkyl tails forms unprecedented hierarchically ordered bulk structures, including rectangular-in-lamellar, tetragonal-in-lamellar, hexagonal-in-lamellar and lamellar-in-lamellar. These novel liquid-crystalline morphologies, which can be designed at low length scales in these systems, are expected to provide final materials with not only...