Phasmids and Polycatenar Mesogens

Nguyen, H. T.; Destrade, C.; Malthte, Jacques

doi:10.1002/9783527620623.ch9

Cited by 16 publications

(2 citation statements)

References 52 publications

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“…[2][3][4][5] These basic molecular structures can be further modified giving rise to controlled structural features of the mesophases. [6][7][8] In the past decade, one of the interesting new designs in the molecular architecture of LCs is the bent-core LC molecules (so-called "bow-shaped" or "banana-shaped" molecules) with a bent geometry at the center of the mesogenic unit. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] The most fascinating results observed in these bent-core achiral LC molecules are helical structures in the B7 phase [9][10][11][12][13][14][15][16][17][18] and the spontaneous macroscopic electric polarization in the B2 phase.…”

Section: Introductionmentioning

confidence: 99%

Origin of Self-Assembled Helical Supramolecular Structures in Achiral C6 Biphenyl Carboxylic Acid Compounds

Jeong

Knapp

et al. 2006

Chem. Mater.

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Section: Introductionmentioning

confidence: 99%

Origin of Self-Assembled Helical Supramolecular Structures in Achiral C6 Biphenyl Carboxylic Acid Compounds

Jeong

Knapp

et al. 2006

Chem. Mater.

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“…The shapes of the molecules are not exactly associated with the types of mesophases formed. Like rod-shaped molecules, each complex shape is likely to organize a nematic, Sm, Col, and 3D-ordered mesophases [19,20]. The incorporation of functionality, amphiphilicity, and nano-segregation into these molecular shapes offers different ways to increase the complexity of LC phases.…”

mentioning

confidence: 99%

Electric‐ and Light‐Responsive Bent‐Core Liquid Crystals: From Molecular Architecture and Supramolecular Nanostructures to Applications

Zhang¹

2013

Intelligent Stimuli‐Responsive Materials

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The three classic states of matter are well known and ubiquitous in everyday life: solid, liquid, and gas. Liquid crystals (LCs), an intermediate state between solid crystal and isotropic liquid, constitute a new fascinating class of condensed soft matter uniquely combining both fluidity and long-range order. The fluid-like mobility enables LCs to be switchable under external stimuli, and crystal-like long-range order bestows anisotropic physical properties on LCs. LCs can be divided into two main classes: thermotropic and lyotropic. Thermotropic LCs consist of individual molecules (or ion pairs) and exhibit phase transitions with the change of temperature. In this case, temperature is the fundamental thermodynamic factor determining mesophase formation. Lyotropic LCs are a special type of solution system that can form mesophases as a function of both temperature and concentration of LC molecules. The building block of a lyotropic phase is an aggregate (called a micelle) formed via self-assembly of many molecules (typically on the order of 100). Examples of LCs can be found both in the natural world and in technological applications. Thermotropic LCs find 189 190 ELECTRIC-AND LIGHT-RESPONSIVE BENT-CORE LIQUID CRYSTALS a wide variety of uses in displays, and an important example of lyotropic LCs is cell membranes formed by amphiphilic lipids. Surfactants in water (i.e., soap water) constitute another useful example of lyotropic LCs. Although the majority of LCs are organic molecules, there exist many LC materials incorporating metals into organic anisotropic molecules [1-3]. These organic-inorganic hybrid LC materials are described as metallomesogens and are recently called metallotropic LCs [4] as distinguished from two main LC classes. In fact, metallomesogens can be classified as either thermotropic or lyotropic LCs depending on their composition and conditions. However, it should be noted that metallomesogens offer a material platform to incorporate magnetic, electronic, optical, redox, and catalytic properties common to inorganic materials into LCs.Although thermotropic LCs have been known to scientists for over 100 years since a discovery by the Austrian botanical physiologist Friedrich Reintizer in 1888, it was only in the late 1960s that they began to be used in display applications. Today, they are best known for their exceptionally successful commercial applications in flat panel display products such as TVs, smart phones, computer displays, and digital projectors. Although today's LC display technology is becoming very advanced, LC materials used in display devices possess the simplest nematic (N) phase and their molecules have been variants on simple rod shapes (Fig. 6.1a). Besides nematic phases, LCs can exhibit other phases: smectic (Sm), columnar (Col), and cubic phases, depending on the orientational or positional orders of their molecules. Nematic phases have only long-range orientational order, smectic mesophases exhibit one-dimensional (1D) positional order and form two-dimensional (2D) layered ...

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Control of Liquid Crystallinity of Diazadibenzoperylene Dyes by Covalent and Hydrogen-Bonded Attachment of Mesogens

2001

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Phasmids and Polycatenar Mesogens

Cited by 16 publications

References 52 publications

Origin of Self-Assembled Helical Supramolecular Structures in Achiral C6 Biphenyl Carboxylic Acid Compounds

Origin of Self-Assembled Helical Supramolecular Structures in Achiral C6 Biphenyl Carboxylic Acid Compounds

Electric‐ and Light‐Responsive Bent‐Core Liquid Crystals: From Molecular Architecture and Supramolecular Nanostructures to Applications

Control of Liquid Crystallinity of Diazadibenzoperylene Dyes by Covalent and Hydrogen-Bonded Attachment of Mesogens

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