Liquid Crystal Dimers

Kumar, Sandeep; Pal, Santanu Kumar

doi:10.1017/9781316662120

Cited by 6 publications

(7 citation statements)

References 334 publications

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“…[ 101 ] The anisotropic semirigid core facilitates structural order during self‐assembly and the terminal groups provide necessary mobility. [ 102 ] For the chiral nematic phase, a chiral moiety could be situated in the terminal chain, incorporated directly into the core, or trapped between two cores. [ 103 ] For the semectic phase, the mesogens contain a ring core, linking groups, lateral functional groups, and peripheral groups.…”

Section: Components Of Lcsmentioning

confidence: 99%

“…[107] Depending on mesogen unit geometries, LC dimers can be categorized into calamitic, discotic, and bent-core dimers, and could form almost all LC phases (Figure 5b). [102] Apart from LC dimers, there are trimers, tetramers, and pentamers, collectively referred to as oligomers, which are composed of three, four, or five mesogenic units linked via flexible spacers, respectively. [106,108,109] Linear oligomers, together with star-shaped molecules, can be used as precursors of LC polymers.…”

Section: Moleculesmentioning

confidence: 99%

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Liquid Crystal Materials for Biomedical Applications

et al. 2023

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Liquid crystal is a state of matter being intermediate between solid and liquid. Liquid crystal materials exhibit both orientational order and fluidity. While liquid crystals have long been highly recognized in the display industry, in recent decades, liquid crystals provide new opportunities into the cross‐field of material science and biomedicine due to their biocompatibility, multifunctionality, and responsiveness. In this review, the latest achievements of liquid crystal materials applied in biomedical fields are summarized. The start is made by introducing the basic concepts of liquid crystals, and then shifting to the components of liquid crystals as well as functional materials derived therefrom. After that, the ongoing and foreseeable applications of liquid crystal materials in the biomedical field with emphasis put on several cutting‐edge aspects, including drug delivery, bioimaging, tissue engineering, implantable devices, biosensing, and wearable devices are discussed. It is hoped that this review will stimulate ingenious ideas for the future generation of liquid crystal‐based drug development, artificial implants, disease diagnosis, health status monitoring, and beyond.

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Section: Components Of Lcsmentioning

confidence: 99%

Section: Moleculesmentioning

confidence: 99%

Liquid Crystal Materials for Biomedical Applications

et al. 2023

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“…[3,4,9] Liquid-crystalline dimers, consisting of two mesogenic units linked via a flexible spacer, have attracted considerable attention due to their rich and unusual mesomorphism, which differs from that of the corresponding monomers. [10][11][12] A wide range of chiral dimers have been studied for technological and fundamental reasons. [13][14][15][16][17] One of the most salient features of this class of materials is that their mesomorphic properties depend on the parity of the flexible spacer, which affects the mutual orientation of the mesogenic units of the dimer.…”

Section: Introductionmentioning

confidence: 99%

The Interplay of Spacer Chirality and Parity in Mesogenic Dimers

Ožegović,

Knežević,

Novak

et al. 2024

ChemPhysChem

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Introducing chirality into soft materials, including liquid crystals (LCs), profoundly impacts their self‐organization and physical properties. In this study, we synthesized a novel series of LC dimers with a chiral center as part of their flexible spacer. The dimers were prepared in racemic and enantiomerically pure forms. Their spacer length and parity were varied to investigate the effect of spacer chirality and parity on mesomorphic behavior and on chiral induction in the nematic phase of achiral mesogens. Our results show that the even‐membered chiral dimers only have chiral nematic phases. In contrast, the odd‐membered dimers display rich mesomorphism, including the intriguing blue phase (BP) and chiral form of the twist‐bend nematic phase (N*TB). The observed significant difference in the 3D surface morphology between the racemic and chiral forms of the N*TB phase suggests that the chiral moiety in the spacer promotes a chiral hierarchy. Furthermore, the chiral dimers show a prominent odd‐even effect in the helical twisting power in nematic hosts. These findings highlight the importance of the position of the chiral group within the dimeric molecule and provide new insights into how intrinsic chirality in the spacer affects the overall structural chirality.

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“…When we look back to the literature, compared to other classes of discotic mesogens, there are meager reports available on dimers consisting of disc‐shaped molecules. Usually, these dimers are composed of two identical cores tethered through a supple or rigid spacer, and the nature of spacer has a profound effect on the structure of mesophase [16–21] . The rigid spacer connecting two disc‐shaped molecules results in the formation of an elliptical mesogen, which can be considered an intermediate between a calamitic and a discotic mesogen.…”

Section: Introductionmentioning

confidence: 99%

“…Usually, these dimers are composed of two identical cores tethered through a supple or rigid spacer, and the nature of spacer has a profound effect on the structure of mesophase. [16][17][18][19][20][21] The rigid spacer connecting two disc-shaped molecules results in the formation of an elliptical mesogen, which can be considered an intermediate between a calamitic and a discotic mesogen. Such systems are found to self-assemble into various columnar as well as nematic mesophases.…”

Section: Introductionmentioning

confidence: 99%

Benzopyrano‐Fused Phenanthridine‐Based Columnar Mesogens: Synthesis, Self‐organization and Charge‐Transport Properties

Bhat

Vadivel

Singh

et al. 2023

Chemistry A European J

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Columnar mesogens constitute a fascinating class of supramolecular nano‐architectures owing to the exceptional properties induced by their self‐assembling behavior. Extending the π‐conjugated core in such systems by incorporating heteroatoms extensively influences their mesomorphic, photophysical properties, etc., presenting them as potential candidates for optoelectronic applications. In the present work, a series of novel nitrogen and oxygen‐incorporated chromenonaphthophenanthridine‐based elliptical dimers have been synthesized through tandem Pictet‐Spengler cyclization followed by ipso‐aromatic substitution in one‐pot. Mesophase characterization has been carried out by employing POM, DSC, and X‐ray diffraction studies. Photophysical properties were investigated using UV‐vis and emission spectroscopy. Furthermore, the charge transport properties were analyzed by time‐of‐flight measurements, and the observed ambipolar mobilities were found to be of the order of 10−3 cm2 V−1 s−1. The high solubility, excellent thermal stability, self‐organizing properties, and ambipolar charge transport characteristics make them promising candidates for applications in organic electronics.

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Liquid Crystal Dimers

Cited by 6 publications

References 334 publications

Liquid Crystal Materials for Biomedical Applications

Liquid Crystal Materials for Biomedical Applications

The Interplay of Spacer Chirality and Parity in Mesogenic Dimers

Benzopyrano‐Fused Phenanthridine‐Based Columnar Mesogens: Synthesis, Self‐organization and Charge‐Transport Properties

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