Synthesis and mesomorphic behaviour of achiral four-ring unsymmetrical bent-core liquid crystals: Nematic phases

Paul, M. K.; Kalita, Gayatri; Laskar, Atiqur Rahman; Debnath, Somen; Gude, Venkatesh; Sarkar, Dipika Debnath; Mohiuddin, Golam; Varshney, Sanjay K.; Rao, V. Pandu Ranga

doi:10.1016/j.molstruc.2013.06.044

Cited by 20 publications

(7 citation statements)

References 71 publications

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“…The phase transition behaviors of DRL are investigated by polarized optical microscopy (POM, Figure a) and differential scanning calorimetry (DSC, Figure b). Based on the DSC thermogram, DRL exhibits an enantiotropic behavior. , Two transition peaks appear almost the same during cooling and subsequent heating at 10 °C/min. POM observation is conducted at a cooling process at 10 °C/min to confirm the formation of ordered phases.…”

Section: Resultsmentioning

confidence: 99%

Polarized Light Emission from Uniaxially Oriented and Polymer-Stabilized AIE Luminogen Thin Films

Koo¹,

Lim²,

Lee³

et al. 2019

Macromolecules

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Organic materials with linearly polarized luminescence (LPL) properties and good processability are critical to the development of advanced optical devices. To fabricate polymer-stabilized thin films with LPL properties, dicyanodistyrylbenzene-based reactive luminogens (abbreviated as DRL) containing both vinyl and thiol units were newly synthesized. On the basis of morphological observations combined with thermal and scattering analyses, it was found that DRL has a nematic liquid crystal mesophase. DRL molecules were uniaxially oriented by surface alignment layer and stabilized by thiol–ene click reaction. Uniaxially oriented and polymer-stabilized DRL thin films showed excellent chemical resistance as well as mechanical and thermal stability due to the chemically cross-linked polymer network. The DRL polymer film exhibited strong emission at 564 nm with remarkable LPL property. The polymer-stabilized films obtained from reactive luminogens with aggregation-induced enhanced emission (AIEE) properties have great potential for the application of advanced optical devices.

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Section: Resultsmentioning

confidence: 99%

Polarized Light Emission from Uniaxially Oriented and Polymer-Stabilized AIE Luminogen Thin Films

Koo¹,

Lim²,

Lee³

et al. 2019

Macromolecules

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“…These lower enthalpy values upon cooling are lower compared to the enthalpy values upon heating. This is due to the fact that the strong Van der Waals interactions between the end of the chain of a neighboring molecule keep them static in the crystalline state before the gradation to liquid crystal starts in the heating cycle [ 36 ]. Comp 24a 24b 24c 24d 24e 24f n 4 5 6 4 5 6 R CH3 CH3 CH3 OCH3 OCH3 OCH3

…”

Section: Structure–property Relationshipmentioning

confidence: 99%

Liquid Crystals Investigation Behavior on Azo-Based Compounds: A Review

Razali

Jamain

2021

Polymers

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Liquid crystal is an intermediate phase between the crystalline solid and an isotropic liquid, a very common substance in our daily lives. Two major classes of liquid crystal are lyotropic, where a liquid crystal is dissolved in a specific solvent under a particular concentration and thermotropic, which can be observed under temperature difference. This review aims to understand how a structure of a certain azo compound might influence the liquid crystal properties. A few factors influence the formation of different liquid crystals: the length of the alkyl terminal chain, inter/intra-molecular interaction, presence of spacer, spacer length, polarization effects, odd-even effects, and the presence of an electron-withdrawing group or an electron-donating group. As final observations, we show the compound’s different factors, the other liquid crystal is exhibited, and the structure–property relationship is explained. Liquid crystal technology is an ideal system to be applied to products to maximize their use, especially in the electronic and medical areas.

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“…reported the first azobenzene substituted bent‐core liquid crystalline materials exhibiting banana‐type mesophases [22,23] . Since then, a library of compounds incorporating five, six, and/or seven aromatic rings in the molecular structure have been prepared to understand the relationship between the structure and the nature of the mesophases [24–36] . The reports on azobenzene‐based bent‐core LCs have been reviewed by M. Alaasar [37] .…”

Section: Introductionmentioning

confidence: 99%

Photo‐Responsive Behavior of Azobenzene Based Polar Hockey‐Stick‐Shaped Liquid Crystals

et al. 2021

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A study on the photoswitching behavior of azobenzene‐based polar hockey‐stick‐shaped liquid crystals (HSLCs) has been presented. Two new series of five phenyl rings based polar HSLCs have been designed and synthesized. Solution state photoisomerization of the synthesized materials was investigated thoroughly via UV‐visible and 1H NMR spectroscopic techniques, whereas solid‐state photochromic behavior was elucidated via physical color change of the materials, solid‐state UV‐visible study, powder XRD, and FE‐SEM techniques. The materials exhibited decent photochromic behavior for different potential applications. The thermal phase behavior of the superstructural assembly has been characterized via polarizing optical microscopy (POM), differential scanning calorimetry (DSC), and temperature‐dependent small and wide‐angle X‐ray scattering (SAXS/WAXS) studies. Depending upon the length of the terminal alkyl chain, nematic (N) and partially bilayer smectic A (SmAd) phases were observed. DFT calculations revealed the favorable anti‐parallel arrangement of the polar molecules that substantiate the formation of SmAd phase.

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Synthesis and mesomorphic behaviour of achiral four-ring unsymmetrical bent-core liquid crystals: Nematic phases

Cited by 20 publications

References 71 publications

Polarized Light Emission from Uniaxially Oriented and Polymer-Stabilized AIE Luminogen Thin Films

Polarized Light Emission from Uniaxially Oriented and Polymer-Stabilized AIE Luminogen Thin Films

Liquid Crystals Investigation Behavior on Azo-Based Compounds: A Review

Photo‐Responsive Behavior of Azobenzene Based Polar Hockey‐Stick‐Shaped Liquid Crystals

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