Liquid-crystalline fullerodendrimers

Deschenaux, Robert; Donnio, Bertrand; Guillon, Daniel

doi:10.1039/b617671m

Cited by 152 publications

(132 citation statements)

References 76 publications

(34 reference statements)

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“…Dendrons 1 -4 gave rise to a smectic A phase in agreement with the nature of the mesomorphic cyanobiphenyl units which tend to be oriented parallel to each other, the consequence of which was the formation of layers [9] [13]. For the first-generation dendrons 1 and 2, an additional nematic phase was also obtained.…”

mentioning

confidence: 52%

“…We designed mesomorphic materials by functionalizing [60]fullerene (nematic, chiral nematic, smectic A, smectic C, columnar phases) [9], [60]fullerene -ferrocene dyads (smectic A phase) [10], and diruthenium clusters (nematic and smectic A phases) [11] with liquid-crystalline dendrimers. The nature of the mesophases and the supramolecular organization within the liquid-crystal state could be controlled via the structure of the mesomorphic units, and the structure and size (generation) of the dendrons.…”

mentioning

confidence: 99%

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Liquid‐Crystalline Thiol‐ and Disulfide‐Based Dendrimers for the Functionalization of Gold Nanoparticles. Preliminary Communication

Frein

Boudon

Vonlanthen

et al. 2008

Helvetica Chimica Acta

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Liquid-crystalline dendrons carrying either a thiol or disulfide function which display nematic, smectic A, columnar, or chiral nematic phases have been synthesized. Their mesomorphic properties are in agreement with the nature of the mesogenic units and structure of the dendrons. The first-generation poly(aryl ester) dendron containing two cyanobiphenyl mesogenic units was used to functionalize gold nanoparticles. For full coverage, a smectic-like supramolecular organization on the nanometer scale is observed, when the gold nanoparticles are spread onto carbon-coated copper grids. This result indicates that the dendritic ligands reported here act as self-organization promoters.Introduction. -Rational design of novel supramolecular materials for applications in optics, electronics, catalysis, and biomedical sciences is still a challenge [1], current interest with this aim being focused on the synthesis of thermotropic liquid-crystalline gold nanoparticles [2 -5]. Decorated gold nanoparticles are one of the most promising candidates for self-organization leading to bulk metamaterials, i.e., materials with nonconventional electromagnetic properties. It has already been shown that regular arrangements of metallic particles on different length scales can lead to negative magnetic permeability [6]. This opens the pathway to metamaterials in the visible light region, provided that the following conditions are fulfilled: the distance and organization of the particles have to be controlled, and there should be a possibility to compensate optical absorption by incorporation of active agents to allow energy transfer [7]. The first condition is fulfilled by the self-organization within the liquidcrystal phase itself, while the second one can be fulfilled by adding fluorescence dyes into the liquid-crystal materials.To generate mesomorphism, gold nanoparticles were functionalized with liquidcrystalline thiol derivatives [2 -4] via a ligand-exchange reaction from dodecane-1-thiol-stabilized gold nanoparticles [8]. Only in one case, the mesophase displayed by the materials could be identified [4]: an enantiotropic nematic phase was obtained for gold nanoparticles partly decorated with laterally-branched mesogens; the latter

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confidence: 52%

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confidence: 99%

Liquid‐Crystalline Thiol‐ and Disulfide‐Based Dendrimers for the Functionalization of Gold Nanoparticles. Preliminary Communication

Frein

Boudon

Vonlanthen

et al. 2008

Helvetica Chimica Acta

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“…In combination with different types of interaction, this provides the possibility for polyphilic molecules to change structure on formation of mesophases. Interesting examples include dendrimers, where a central dendritic core has been functionalised by a flexible chain and a terminal mesogenic group [9,10], multipedal mesogens containing a central octasilsesquioxane core [11] and fullerene containing liquid crystals [12,13]. Some of the recent exciting work in this area has been summarised in a number of excellent review articles [14][15][16][17][18][19], which draw parallels between polyphilic thermotropic liquid crystals, block copolymers and self-assembly in amphiphilic and biological systems.…”

Section: Introductionmentioning

confidence: 99%

Simulation of bulk phases formed by polyphilic liquid crystal dendrimers

Ilnytskyi¹,

Lintuvuori²,

Wilson³

2010

Condens. Matter Phys.

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A coarse-grained simulation model for a third generation liquid crystalline dendrimer (LCDr) is presented. It allows, for the first time, for a successful molecular simulation study of a relation between the shape of a polyphilic macromolecular mesogen and the symmetry of a macroscopic phase. The model dendrimer consists of a soft central sphere and 32 grafted chains each terminated by a mesogen group. The mesogenic pair interactions are modelled by the recently proposed soft core spherocylinder model of Lintuvuori and Wilson [J. Chem. Phys, 128, 044906, (2008)]. Coarse-grained (CG) molecular dynamics (MD) simulations are performed on a melt of 100 molecules in the anisotropic-isobaric ensemble. The model LCDr shows conformational bistability, with both rod-like and disc-like conformations stable at lower temperatures. Each conformation can be induced by an external aligning field of appropriate symmetry that acts on the mesogens (uniaxial for rod-like and planar for disc-like), leading to formation of a monodomain smectic A (Sm A ) or a columnar (Col) phase, respectively. Both phases are stable for approximately the same temperature range and both exhibit a sharp transition to an isotropic cubic-like phase upon heating. We observe a very strong coupling between the conformation of the LCDr and the symmetry of a bulk phase, as suggested previously by theory. The study reveals rich potential in terms of the application of this form of CG modelling to the study of molecular self-assembly of liquid crystalline macromolecules.

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“…Dendrons D1, D2, co-dendrimer 2, and dendrimer 1 have been synthesized as described earlier [5,6]. The dielectric, elecro-optical, and hydrodynamic properties of 1, 2, D1, and D2 have been investigated in dilute benzene solutions.…”

Section: Methodsmentioning

confidence: 99%

“…Two approaches have been reported recently for the design of fullerene-containing poly(aryl ester) or poly(aryl ester)=poly(benzyl ether) dendritic thermotropic liquid crystals [5,6]. First approach, based on the addition of liquid crystalline addends to C 60 by applying Bingel reaction [7], produces mesomorphic methanofullerenes (Fig.…”

Section: Introductionmentioning

confidence: 99%

Mesomorphic Poly(aryl ester)/Poly(benzyl ether) Dendrimers/co-Dendrimers with C₆₀as the Core

Yevlampieva

Beljaev

Lavrenko

et al. 2009

Molecular Crystals and Liquid Crystals

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Structure-properties relations of liquid crystalline fullerene-containing poly(aryl ester)=poly(benzyl ether) dendritic compounds with variation of C 60 linkage type have been analyzed based on experimental data on their total polarity and electrooptical Kerr effect in benzene solutions. There was established that fulleropyrrolidine as the core of dendrimer strongly restricts rotational freedom of dendrons, in contrast to methanofullerene. A conclusion that not only terminal mesogenic groups and dendrons' generation number, but a manner of C 60 incorporation into the dendritic matrix also influences on the mesomorphic behavior of these multicomponent hybrid-type liquid crystalline compounds had been made.

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Liquid-crystalline fullerodendrimers

Cited by 152 publications

References 76 publications

Liquid‐Crystalline Thiol‐ and Disulfide‐Based Dendrimers for the Functionalization of Gold Nanoparticles. Preliminary Communication

Liquid‐Crystalline Thiol‐ and Disulfide‐Based Dendrimers for the Functionalization of Gold Nanoparticles. Preliminary Communication

Simulation of bulk phases formed by polyphilic liquid crystal dendrimers

Mesomorphic Poly(aryl ester)/Poly(benzyl ether) Dendrimers/co-Dendrimers with C₆₀as the Core

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Liquid-crystalline fullerodendrimers

Cited by 152 publications

References 76 publications

Liquid‐Crystalline Thiol‐ and Disulfide‐Based Dendrimers for the Functionalization of Gold Nanoparticles. Preliminary Communication

Liquid‐Crystalline Thiol‐ and Disulfide‐Based Dendrimers for the Functionalization of Gold Nanoparticles. Preliminary Communication

Simulation of bulk phases formed by polyphilic liquid crystal dendrimers

Mesomorphic Poly(aryl ester)/Poly(benzyl ether) Dendrimers/co-Dendrimers with C60as the Core

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Mesomorphic Poly(aryl ester)/Poly(benzyl ether) Dendrimers/co-Dendrimers with C₆₀as the Core