A General Method for Measurement of Enantiomeric Excess by Using Electrooptics in Ferroelectric Liquid Crystals

Walba, David M.; Eshdat, Lior; Körblová, Eva; Shao, Renfan; Clark, Noel A.

doi:10.1002/ange.200603692

Cited by 4 publications

(1 citation statement)

References 38 publications

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“…The effects of microscopic chiral constituents on the macroscopic structures they form especially in liquid crystals are discussed in ref , and there are several molecular and statistical theories developed focusing on calculations of helical twisting powers and chiral indices or parameters, e.g., refs , − . Chirality also changes the physical properties of liquid crystals and ferroelectric, as well as chirally doped smectic A, materials have been used for determination of enantiomeric excess in compounds that could be doped into such systems. , …”

Section: Introductionmentioning

confidence: 99%

Chirality Detection Using Nematic Liquid Crystal Droplets on Anisotropic Surfaces

et al. 2016

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Nematic liquid crystals (NLCs) form helical macroscopic structures through chiral induction when doped with chiral species. We describe a very simple, though highly sensitive method for determination of handedness and pitch of the induced twist in the case of very weak twisting powers of such chiral dopants. A tiny drop-typically less than 10 nL-of the chiral doped NLC is placed on a plate promoting a uniform planar surface anchoring of the liquid crystal director. At the curved NLC-air interface the anchoring is homeotropic and in the sessile droplets we get a locally twisted hybrid director structure with a disclination line extending across the droplet. The configuration of the disclination line (S-like or backwards S-like) reveals the sign of twisting power and extremely large pitch values in the range of 10 mm can easily be measured. We demonstrate the method using the standard NLC 4-cyano-4'-pentylbiphenyl (5CB), weakly doped with the chiral material 2-hydroxy-2-phenylacetic acid (mandelic acid).

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Section: Introductionmentioning

confidence: 99%

Chirality Detection Using Nematic Liquid Crystal Droplets on Anisotropic Surfaces

et al. 2016

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Übertragung und Amplifikation von Informationen und Eigenschaften in nanostrukturierten Flüssigkristallen

et al. 2008

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In den letzten Jahren hat sich das Design der chemischen Strukturen flüssigkristalliner Materialien stark und in vielen Fällen sogar radikal verändert. Seit Reinitzers Tagen wurden Flüssigkristalle entweder als stab‐ oder als scheibenförmig klassifiziert; Kombinationen davon führten zu phasmidischen Flüssigkristallen. Die Entdeckung, dass Materialien mit gebogenen Molekülstrukturen eine völlig neue Familie von Mesophasen bilden, hat den Fokus auf Substanzen mit einer großen Variationsbreite an Molekültopologien gerichtet: von Pyramiden zu Kreuzen und dendritischen Molekülen. Die Molekülstrukuren supermolekularer Materialien können durch Konformationsänderungen verformt werden können, was zu einer Stabilisierung der Mesophase führen kann, und Substanzen, die selbst nicht mesogen sind, können mesogene supramolekulare Komplexe bilden. Die Bildung von Mesophasen ist ein Prozess der Selbstorganisation, der bei supramolekularen Systemen auf zwei Ebenen stattfindet. In diesem Aufsatz wird gezeigt, dass 1) verformbare Molekülstrukturen und ‐topologien supermolekularer und selbstorganisierter supramolekularer Systeme, 2) Erkennungsprozesse an Grenzflächen von Superstrukturen und 3) die Übertragung und Amplifikation dieser Strukturen zur Bildung ungewöhnlicher Mesophasen führen können, die mit der konventionellen Kontinuumstheorie nicht ausreichend beschrieben werden können.

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Transmission and Amplification of Information and Properties in Nanostructured Liquid Crystals

et al. 2008

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In recent years the design of chemical structures of liquid-crystalline materials has developed rapidly, and in many cases changed radically. Since Reinitzer's days, liquid crystals have either been classed as rodlike or disclike, with combinations of the two leading to phasmidic liquid crystals. The discovery that materials with bent molecular structures exhibited whole new families of mesophases inspired investigations into the liquid-crystal properties of materials with widely varying molecular topologies-from pyramids to crosses to dendritic molecules. As a result of conformational change, supermolecular materials can have deformable molecular structures, which can stabilize mesophase formation, and some materials that are non-mesogenic, on complexation form supramolecular liquid crystals. The formation of mesophases by individual molecular systems is a process of self-organization, whereas the mesophases of supramolecular systems are formed by self-assembly and self-organization. Herein we show 1) deformable molecular shapes and topologies of supermolecular and self-assembled supramolecular systems; 2) surface recognition processes of superstructures; and 3) that the transmission of those structures and their amplification can lead to unusual mesomorphic behavior where conventional continuum theory is not suitable for their description.

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A General Method for Measurement of Enantiomeric Excess by Using Electrooptics in Ferroelectric Liquid Crystals

Cited by 4 publications

References 38 publications

Chirality Detection Using Nematic Liquid Crystal Droplets on Anisotropic Surfaces

Chirality Detection Using Nematic Liquid Crystal Droplets on Anisotropic Surfaces

Übertragung und Amplifikation von Informationen und Eigenschaften in nanostrukturierten Flüssigkristallen

Transmission and Amplification of Information and Properties in Nanostructured Liquid Crystals

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