Liquid crystalline dendrimers

Donnio, Bertrand; Buathong, Saïwan; Bury, Izabela; Guillon, Daniel

doi:10.1039/b605531c

Cited by 233 publications

(110 citation statements)

References 138 publications

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“…[11] After the substitution, TEM experiments (observations on a carbon-coated copper grid) showed that the diameter of the core of the particles remained unchanged (21 ± 5 Å) (Fig. S1, Supporting Information), which was also confirmed by the unchanged plasmon UV-vis band after substitution (Fig.…”

Section: This Paper Is Dedicated To Marc Drillon On the Occasion Of supporting

confidence: 57%

Dendronized Ferromagnetic Gold Nanoparticles Self‐Organized in a Thermotropic Cubic Phase

Donnio¹,

Garcia-Vazquez²,

Gallani³

et al. 2007

Advanced Materials

130

107

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This paper is dedicated to Marc Drillon, on the occasion of his 60th birthday.The much-talked-about "nanotechnology revolution" shall probably not occur without the prior emergence of reliable self-assembling techniques. It is quite clear today that in spite of incredible progress, top-down technologies and lithographic techniques are getting close to the end of their evolutionary course. With the promise of lower cost and high throughput, self-assembling techniques stand unrivaled, the mere existence of Nature's billions of self-assembled living creatures being an obvious proof of their ultimate efficiency. Moreover, as space is no longer a problem in nanoscale devices, such systems can have an inherent potentially high redundancy making them much less sensitive to damage or fabrication errors than the present ones.In the current literature on nanodevices, the term nanoparticles (NPs) can actually convey many different meanings. In terms of size, first, since the "nanoworld" spans several orders of magnitude, and in terms of functionality, second, as the function may be that of a single particle (e.g., quantum dots) or one brought about by the periodic structuring of space via the self-organization of hundreds of particles (e.g

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Section: This Paper Is Dedicated To Marc Drillon On the Occasion Of supporting

confidence: 57%

Dendronized Ferromagnetic Gold Nanoparticles Self‐Organized in a Thermotropic Cubic Phase

Donnio¹,

Garcia-Vazquez²,

Gallani³

et al. 2007

Advanced Materials

130

107

View full text Add to dashboard Cite

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“…However, this possibility must be ruled out considering that all the compounds that show rectangular columnar mesomorphism contain a poly(benzyl ether) dendron. 61,63 This dendron is known to promote columnar mesomorphism. 61,63 From the observed reflections, the 2D space groups for the rectangular columnar phases of compounds 2, 3, 5, and 7 can be deduced on the basis of the extinction rules that govern the space-groups attribution.…”

Section: 5mentioning

confidence: 99%

“…61,63 This dendron is known to promote columnar mesomorphism. 61,63 From the observed reflections, the 2D space groups for the rectangular columnar phases of compounds 2, 3, 5, and 7 can be deduced on the basis of the extinction rules that govern the space-groups attribution. 70 For 5 and 7 this attribution can only .…”

Section: 5mentioning

confidence: 99%

Liquid-Crystalline Dendrimers Designed by Click Chemistry

et al. 2016

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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 mesomorphic properties have been studied by thermal analysis (POM, DSC) and small-angle X-ray scattering. Smectic A, nematic, and columnar phases have been observed depending on the dendritic building blocks. The click reaction has proven to be a powerful and elegant synthetic tool for the design of complex dendritic liquid-crystalline architectures. ■ INTRODUCTIONThe development of nanoscale devices with specific properties (e.g., optical, magnetic, redox properties) obtained by the selfassembly of functional building blocks requires important efforts in the molecular design.1,2 In this context, liquid crystals are a class of materials of particular interest due to their controllable self-organization behavior.3 Structural engineering at the molecular level, by designing mesomorphic units with accurate shape, length, polarity, or chirality, is the key step to modulate the self-organization process and tune the physicochemical properties of the target supramolecular architectures.4,5 Thus, the development of complex liquid-crystalline nanostructures with tailor-made and high performance properties requires effective and versatile synthetic tools.The copper-catalyzed azide−alkyne "click" cycloaddition (CuAAC) 6−8 is of interest as it requires mild reaction conditions and simple work-up procedures, tolerates a wide range of functional groups, and leads to high yields. Thus, the CuAAC reaction was applied for the synthesis and modification of various supramolecular architectures such as gels, and dendrimers, 55 were also prepared by applying this chemical transformation.In the field of liquid crystals, we successfully applied the CuAAC reaction for the synthesis of liquid-crystalline gold nanoparticles: first-and second-generation mesomorphic cyanobiphenyl-based dendrons were grafted onto the gold core, and the formation of smectic A phases was observed. 56,57 We also reported hexadducts of [60]fullerene (C 60 ) prepared by clicking 12 chiral or achiral first-generation poly(benzyl ether) dendrons onto a C 60 derivative. 58 The materials gave rise to supramolecular helical columns.The aim of this study is to exploit the click chemistry as an effective and elegant approach for the assembly of two dendrons leading to novel liquid-crystalline dendrimers. This strategy, which allows to connect dendrons with identical, similar, or different properties, is an interesting way to design liquid-crystalline dendrimers with tailor-made self-assembly properties based on the characteristics of each individual dendron.We report, herein, the synthesis, characterization, and mesomorphic properties of three clicked dendrimers (1−3, Figures ...

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“…[12,13] Liquid-crystal dendrimers in comparison with low molecular weight mesogens provide a highly congested environment that restricts the mobility of the mesogenic units of the molecules and thus favours enhancement of the microsegregation that leads to a finer control of mesomorphic behaviour. [14,15] The structure and generation of the dendrimer and the chemical nature of the mesogenic units introduced determine the liquid-crystal properties of the material. [16] Organic electronics and the possibilities that arise from the fabrication of new devices such as organic light-emitting diodes, [17][18][19][20] organic field effect transistors [21,22] and organic photovoltaics [23][24][25] based on organic molecules have driven a promising field of research of new multifunctional materials that can compete with the already established polycrystalline inorganic materials.…”

Section: Introductionmentioning

confidence: 99%

Functional Carbazole Liquid‐Crystal Block Codendrimers with Optical and Electronic Properties

Gracia

Feringán

Serrano

et al. 2014

Chemistry A European J

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The synthesis and characterisation of a family of block codendrimers consisting of highly versatile mesogenic and carbazole-containing 2,2-bis(hydroxymethyl)propionic acid (bis-MPA) dendrons are reported. The liquid-crystal behaviour was investigated by means of differential scanning calorimetry, polarised-light optical microscopy and X-ray diffraction. Depending on the chemical structure of the constituent dendrons, the codendrimers show lamellar or columnar mesophases. On the basis of the experimental results, models both at the molecular level and in the mesophase are proposed. The physical properties of the block codendrimers derived from the presence of the carbazole moiety in their structure were investigated: photoluminescence in solution and in the mesophase, electrochemical behaviour and hole transport. Electrodeposition of carbazole dendrons afforded a globular supramolecular conformation in which the mesogenic molecular side plays a key role.

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Liquid crystalline dendrimers

Cited by 233 publications

References 138 publications

Dendronized Ferromagnetic Gold Nanoparticles Self‐Organized in a Thermotropic Cubic Phase

Dendronized Ferromagnetic Gold Nanoparticles Self‐Organized in a Thermotropic Cubic Phase

Liquid-Crystalline Dendrimers Designed by Click Chemistry

Functional Carbazole Liquid‐Crystal Block Codendrimers with Optical and Electronic Properties

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