Bent‐Core Mesogens with Branched Carbosilane Termini: Flipping Suprastructural Chirality without Reversing Polarity

Zhang, Yongqiang; O’Callaghan, Michael; Baumeister, Ute; Tschierske, Carsten

doi:10.1002/anie.200800814

Cited by 20 publications

(1 citation statement)

References 32 publications

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“…They have allowed knowing the effect of introducing stereogenic centers in this type of phases. Also remarkable is the use of bulky silicon-containing groups to end the molecules . In both cases these terminal tails could be used to control the ferro/antiferroelectric ground arrangement of this type of material.…”

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Terminal Chains as a Tool To Modulate the Properties of Bent-Core Liquid Crystals

Gimeno¹,

Barberá²,

Serrano³

et al. 2009

Chem. Mater.

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Two series of bent-shaped liquid crystals derived from 4,4 0 -diphenylmethane and 3,4 0 -biphenylene moieties have been prepared and studied. The research, focused on the effect of the terminal chains on the mesogenic properties of bent-core compounds, demonstrates that they can be used as a tool to control their liquid crystal behavior. Together with achiral and chiral alkoxy tails, thioalkoxy chains and unusual terminal structures on bent-core mesogens such as oxyethylene moieties or unsaturated tails of different lengths have been investigated. Mesomorphism as well as dielectric responses of the new materials are reported and discussed in light of structural considerations. Interesting results concerning lowering of transition temperatures, mesophase vitrification, or columnar-lamellar sequences have been achieved by the incorporation of these terminal chains.

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confidence: 99%

Terminal Chains as a Tool To Modulate the Properties of Bent-Core Liquid Crystals

Gimeno¹,

Barberá²,

Serrano³

et al. 2009

Chem. Mater.

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Ferroelectric Liquid Crystals for Nonlinear Optical Applications

Zhang

Etxebarría

2012

Liquid Crystals Beyond Displays

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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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Bent‐Core Mesogens with Branched Carbosilane Termini: Flipping Suprastructural Chirality without Reversing Polarity

Cited by 20 publications

References 32 publications

Terminal Chains as a Tool To Modulate the Properties of Bent-Core Liquid Crystals

Terminal Chains as a Tool To Modulate the Properties of Bent-Core Liquid Crystals

Ferroelectric Liquid Crystals for Nonlinear Optical Applications

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

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