Unconventional liquid crystal oligomers with a hierarchical structure

Yoshizawa, Atsushi

doi:10.1039/b802712a

Cited by 75 publications

(26 citation statements)

References 116 publications

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“…[126][127][128][129] Linear higher oligomers pose synthetic challenges, chiefly as efficient chromatographic purification is challenging, however some examples of pentamers exist. 130,131 In the context of the twist-bend nematic phase relatively few oligomeric materials are known to exhibit this state of matter. The hydrogen-bonded trimer formed spontaneously by 172 (CB6OBA , Table 30) was the first trimeric twist-bend nematogen to be reported; the analogue with even spacer parity, 171, (CB5OBA) does not exhibit the twist-bend nematic phase.…”

Section: Oligomers: Trimers and Tetramersmentioning

confidence: 99%

The dependency of twist-bend nematic liquid crystals on molecular structure: a progression from dimers to trimers, oligomers and polymers

Mandle

2016

Soft Matter

115

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This article gives an overview on recent developments concerning the twist-bend nematic phase. The twist-bend nematic phase has been discussed as the missing link between the uniaxial nematic mesophase (N) and the helical chiral nematic phase (N*). After an introduction discussing the key physical properties of the N phase and the methods used to identify the twist-bend nematic mesophase this review focuses on structure property relationships and molecular features that govern the incidence of this phase.

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Section: Oligomers: Trimers and Tetramersmentioning

confidence: 99%

The dependency of twist-bend nematic liquid crystals on molecular structure: a progression from dimers to trimers, oligomers and polymers

Mandle

2016

Soft Matter

115

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“…Liquid crystalline oligomers (dimers, trimers etc) and dendrimers are another interesting class of materials which possess relatively high molar mass but are monodisperse in nature. Their properties are intermediate between the molecular and macromolecular LCs and they nicely demonstrate how different properties evolve from molecular to macromolecular LCs (186)(187)(188)(189)(190).…”

Section: Polymeric Liquid Crystalsmentioning

confidence: 87%

Liquid Crystals

Bisoyi

2014

Kirk-Othmer Encyclopedia of Chemical Technology

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Liquid crystals (LCs) represent a state of matter which is characterized by a unique combination of order and mobility on molecular, supramolecular and macroscopic levels. This is a true thermodynamic stable state of matter and has been recognized and accepted as the fourth state of matter after solid, liquid, and gas (1-18). They have developed from a mere scientific curiosity in the beginning to one of the foundations of mobile information technology devices today (19)(20)(21)(22)(23)(24)(25). LCs are presently common topics in academic books and also in our daily life. Terms such as LCD, ie, LC display, and Kevlar have become familiar consumer products. The unusual feature which makes this state of matter unique among the others is the combination of orientational (and, sometimes, positional) order and dynamics, giving rise to materials with anisotropic physical properties that are switchable under the influence of small external stimuli. LCs have been regarded as unique functional soft materials from both scientific and technological point of view. The unique combination of counterintuitive properties, ie, order and fluidity, is not only an essential requirement for living matter, but also it is the foundation of the numerous technological applications of LC materials. Simultaneous exhibition of order and dynamics is the basic principle for self-organization and structure formation in living systems. Accordingly, LCs play a crucial role in living systems and in biology (18). For example, no life would be possible without the ordered and dynamic self-assembly of lipids into bilayers within the cell membrane. Several biological molecules such as lipids, carbohydrates, proteins, and nucleic acids have been found to exist in various liquid crystalline phases (26-34). The appearance of mesomorphism in DNAs has been related to the significant role that LCs would have played in the evolution of biological information in the pre-biotic world (35-38). LCs self-assemble into various structures with the help of many different types of molecular interactions such as van der Waals, dipolar and quadrupolar interaction, charge transfer, p-p interaction, metal coordination, and hydrogen bonding. Thus, LCs can be considered as prototype supramolecular systems which furnish well-defined self-assembled architectures using noncovalent secondary interactions (39). Scientifically, the LC field is a fertile ground to study supramolecular self-assembly of matter and soft materials. Moreover, LCs persuasively demonstrate the powerful organization principle of matter by maximizing the interaction energy and minimizing the excluded volume.Overall, LCs have developed into a fascinating and prosperous field, reaching out into different areas of science by providing basic knowledge of the fundamental rules governing self-assembly from simple to complex modes. The domains of LCs span across multiple disciplines of pure and applied science including optics, materials science, bioscience, nanoscience etc. Their science and technology are tru...

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“…However, recent observations of SmC-like cybotacticity in bent-core molecules can cover the entire N temperature range. Also U-shaped LC molecules in which correlation exists among the dynamics of the two mesogenic parts are seen to induce smectic ordering in a nematic phase, viz., a N cyb phase [24,25]. A U-shaped mesogenic compound was synthesized in which two LC molecules were connected via catechol [26].…”

Section: Introduction To Liquid Crystalsmentioning

confidence: 99%

Recent NMR Studies of Thermotropic Liquid Crystals

Dong¹

2016

Annual Reports on NMR Spectroscopy

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Unconventional liquid crystal oligomers with a hierarchical structure

Cited by 75 publications

References 116 publications

The dependency of twist-bend nematic liquid crystals on molecular structure: a progression from dimers to trimers, oligomers and polymers

The dependency of twist-bend nematic liquid crystals on molecular structure: a progression from dimers to trimers, oligomers and polymers

Liquid Crystals

Recent NMR Studies of Thermotropic Liquid Crystals

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