Liquid Crystalline Dendrimers and Polypedes

Donnio, Bertrand; Guillon, Daniel

doi:10.1007/12_079

Cited by 127 publications

(60 citation statements)

References 307 publications

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“…Such cores can be regarded among others as simplest cores and branching units of dendrimers, [3][4][5] branching units for polymers [24] or branching points for metal-organic frame- works (MOFs) [25] and as building blocks for supramolecular cages. [26] Thus, it is straight forward to attach three arms to a commercial core in order to study the properties of Hekates, which are also very attractive from the viewpoint of symmetry.…”

Section: Classification and Motivationmentioning

confidence: 99%

“…In contrast, non-conventional mesogens, which have become very popular in recent years, lack such shape-anisotropy of the core unit. Among the different structures are multiarmmesogens, dendrons, dendrimers [2][3][4][5] and supramolecular mesogens, such as metallomesogens [6] and hydrogen-bonded mesogens. [1,7] The driving force for the self-assembly of these molecules in liquid-crystalline (LC) phases is based on the nanosegregation of chemically or physically different building blocks and the tendency to efficiently fill space in condensed matter.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Star Mesogens (Hekates)—Tailor‐Made Molecules for Programming Supramolecular Functionality

Lehmann

2009

Chemistry A European J

106

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This concept article focuses on the simplest branched liquid crystalline (LC) molecules--the three-armed mesogens with arms symmetrically linked to the core. They are basic but fascinating mesogens for the exploration of self-assembling processes into complex, functional, soft materials. Quite a large number of elements of diversity provide the possibility to synthetically program such star-shaped molecules and to control phase formation, if aggregation processes are fully understood. Recently, ABC-cores opened the way to non-symmetric mesogens and, therefore, to the concept of multifunctional materials with defined nanostructures. In the article this outstanding family of mesogens is classified, their peculiar molecular structure and self-assembly are discussed and potential applications are presented, in which this type of mesogen may be beneficial.

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Section: Classification and Motivationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Star Mesogens (Hekates)—Tailor‐Made Molecules for Programming Supramolecular Functionality

Lehmann

2009

Chemistry A European J

106

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“…This leads to new morphologies, more complex than those shown in figure 2. Morphologies of linear [20,21] and branched block copolymers [22][23][24][25], rod-coil polymers [26], dendrimers [27,28] and also oligomers containing mesogenic units [29] have been reviewed previously in the cited references and therefore will not be discussed here.…”

mentioning

confidence: 99%

Complex tiling patterns in liquid crystals

et al. 2011

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In this account recent progress in enhancing the complexity of liquid crystal self-assembly is highlighted. The discussed superstructures are formed mainly by polyphilic T-shaped and X-shaped molecules composed of a rod-like core, tethered with glycerol units at both ends and flexible non-polar chain(s) in lateral position, but also related inverted molecular structures are considered. A series of honeycomb phases composed of polygonal cylinders ranging from triangular to hexagonal, followed by giant cylinder honeycombs is observed for ternary T-shaped polyphiles on increasing the size of the lateral chain(s). Increasing the chain size further leads to new modes of lamellar organization followed by three-dimensional and two-dimensional structures incorporating branched and non-branched axial rod-bundles. Grafting incompatible chains to opposite sides of the rod-like core leads to quaternary X-shaped polyphiles. These form liquid crystalline honeycombs where different cells are filled with different material. Projected on an Euclidian plane, all honeycomb phases can be described either by uniformly coloured Archimedean and Laves tiling patterns (T-shaped polyphiles) or as multi-colour tiling patterns (X-shaped polyphiles). It is shown that geometric frustration, combined with the tendency to segregate incompatible chains into different compartments and the need to find a periodic tiling pattern, leads to a significant increase in the complexity of soft self-assembly. Mixing of different chains greatly enhances the number of possible 'colours' and in this way, periodic structures comprising up to seven distinct compartments can be generated. Relations to biological self-assembly are discussed shortly.

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“…For example, compound 45, shown in Fig. 53 [76] is similar in topology to supermolecule 43 shown in Fig. 40.…”

Section: Effect Of Hard Core Scaffolds -Fullerenementioning

confidence: 89%

“…In this series of materials up to 124 mesogens have been attached to the periphery, and at higher number densities of mesogens, i.e., for higher generations of the dendritic scaffold, columnar phases start to appear. However, the introduction of columnar phases at higher generations is indicative of the flexibility of the scaffold, which allows for a wide variety of conformers to be present in the lower generations that support the formation of rod-like gross shapes of the supermolecule (see Donnio and Guillon for a very detailed review of liquid-crystalline dendrimers and polypedes [76]). …”

Section: Liquid-crystalline Polypedes -Dendrimersmentioning

confidence: 98%