Theoretical Study of Hydrogen-Bonded Supramolecular Liquid Crystals

Shoji, Masahiko; Tanaka, Fumihiko

doi:10.1021/ma020277e

Cited by 37 publications

(16 citation statements)

References 44 publications

(88 reference statements)

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“…This supramolecular association of liquid crystals has been theoretically treated by Tanaka and co-workers. [64,65] The second type of hydrogenbonded liquid crystals has open (non-closed) structures, such as ribbons and layers (Figure 4 C,D). [7,24,28] They are generated by the formation of sucessive hydrogen bonds, or a network of hydrogen bonds.…”

Section: New Design Of Liquid-crystalline Assembliesmentioning

confidence: 99%

Functional Liquid‐Crystalline Assemblies: Self‐Organized Soft Materials

2005

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In the 21st century, soft materials will become more important as functional materials because of their dynamic nature. Although soft materials are not as highly durable as hard materials, such as metals, ceramics, and engineering plastics, they can respond well to stimuli and the environment. The introduction of order into soft materials induces new dynamic functions. Liquid crystals are ordered soft materials consisting of self-organized molecules and can potentially be used as new functional materials for electron, ion, or molecular transporting, sensory, catalytic, optical, and bio-active materials. For this functionalization, unconventional materials design is required. Herein, we describe new approaches to the functionalization of liquid crystals and show how the design of liquid crystals formed by supramolecular assembly and nano-segregation leads to the formation of a variety of new self-organized functional materials.

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Section: New Design Of Liquid-crystalline Assembliesmentioning

confidence: 99%

Functional Liquid‐Crystalline Assemblies: Self‐Organized Soft Materials

2005

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“…4 [23] auf supramolekulare Polymere ausgedehnt. [42,62,63] Die molekulare Organisation von Flüssigkristallen durch Wasserstoffbrücken lässt sich gemäß Abbildung 4 klassifizieren: [7,24,28] [64,65] Die zweite Art wasserstoffverbrückter Mesogene enthält offene Strukturen wie Bänder oder Schichten [7,24,28] mit Wasserstoffbrückennetzwerken (Abbildung 4 C, D). Alle diese Architekturen werden durch Selbstorganisationsprozesse erhalten, bei denen sich viele Moleküle unter milden Bedingungen spontan zu komplexen geordneten Strukturen zusammenlagern.…”

Section: Introductionunclassified

Funktionelle flüssigkristalline Aggregate: selbstorganisierte weiche Materialien

2005

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Dynamische weiche Materialien werden im 21. Jahrhundert an Bedeutung gewinnen. Zwar sind diese Funktionsmaterialien nicht so beständig wie Metalle, Keramiken oder Plastik, dafür reagieren sie aber gut auf externe Reize. Geordnete weiche Materialien können dynamische Funktionen erfüllen. Flüssigkristalle aus selbstorganisierten Molekülen sind ein Beispiel hierfür: Sie eignen sich möglicherweise zum Elektronen‐, Ionen‐ oder Stofftransport sowie als sensorisch, katalytisch, optisch oder biologisch aktive Materialien. Um diese Funktionen auszuschöpfen, benötigt man unkonventionelle Materialentwürfe. Hier beschreiben wir aktuelle Ansätze zur Funktionalisierung von Flüssigkristallen und zeigen, wie das Design von Flüssigkristallen durch supramolekulare Aggregation und Nanophasentrennung zu einer Vielfalt selbstorganisierter Funktionsmaterialien führt.

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“…Geometrical conformations of the liquid crystalline (LC) materials depend on their molecular structures [1][2][3][4][5], which could impact mesophase stability. Hydrogen-bonded (H-bonded) liquid crystalline complexes were reported for the first time by Bradfield, Gray, and Jones [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

New Symmetrical U- and Wavy-Shaped Supramolecular H-Bonded Systems; Geometrical and Mesomorphic Approaches

et al. 2020

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New mesomorphic symmetrical 2:1 supramolecular H-bonded complexes of seven phenyl rings were prepared between 4-n-alkoxyphenylazobenzoic acids and 4-(2-(pyridin-3-yl)diazenyl)phenyl nicotinate. Mesomorphic studies of the prepared complexes were investigated using differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). Fermi bands of the formed H-bonded interactions were confirmed by FT-IR spectroscopy. Geometrical parameters for all complexes were performed using the density functional theory (DFT) calculations method. Theoretical results revealed that the prepared H-bonded complexes are in non-linear geometry with U-shaped and wavy-shaped geometrical structures; however, the greater linearity of the wavy-shaped compounds could be the reason for their stability with respect to the U-shaped conformer. Moreover, the stable, wavy shape of supramolecular H-bonded complexes (SMHBCs) has been used to illustrate mesomeric behavior in terms of the molecular interaction. The experimental mesomorphic investigations revealed that all complexes possess enantiotropic smectic C phase. Phases were confirmed by miscibility with a standard smectic C (SmC) compound. A comparison was constructed to investigate the effect of incorporating azophenyl moiety into the mesomeric behavior of the corresponding five-membered complexes. It was found that the addition of the extra phenylazo group to the acid moiety has a great increment of the mesophase stability (TC) values with respect to the monotropic SmC phase of the five aromatic systems to the high stable enantiotropic SmC mesophase.

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Theoretical Study of Hydrogen-Bonded Supramolecular Liquid Crystals

Cited by 37 publications

References 44 publications

Functional Liquid‐Crystalline Assemblies: Self‐Organized Soft Materials

Functional Liquid‐Crystalline Assemblies: Self‐Organized Soft Materials

Funktionelle flüssigkristalline Aggregate: selbstorganisierte weiche Materialien

New Symmetrical U- and Wavy-Shaped Supramolecular H-Bonded Systems; Geometrical and Mesomorphic Approaches

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