Thin films of discotic liquid crystals and their applications

Gupta, R. K.; Manjuladevi, V.; Karthik, C.; Choudhary, Keerti

doi:10.1080/02678292.2016.1195454

Cited by 58 publications

(17 citation statements)

References 50 publications

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“…In addition, the columns formed through the stacking of the large aromatic triphenylene cores display excellent photoelectric properties. 63,64 Here, we demonstrate that the ionic association of discotic liquid crystalline TP tethered imidazoliums to hexanuclear rhenium clusters allow the emergence of original crystalline and liquid crystalline columnar phases in which the spherical anions and the TP moieties can be packed into lamellaes or columns. The red-NIR emissive [Re 6 Se 8 (CN) 6 ] 4cluster anionic unit has been chosen for two main reasons: i) the high stability of the Re -CN bond towards potential ligand exchange and ii) its higher anionic charge compared to Mo 6 or W 6 anionic halide clusters.…”

Section: Introductionmentioning

confidence: 78%

Ionic columnar clustomesogens: associations between anionic hexanuclear rhenium clusters and liquid crystalline triphenylene tethered imidazoliums

et al. 2018

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Providing several functionalities to a single material is an emerging challenge with many industrial prospects in materials sciences. Self-assembled organic-inorganic hybrid materials endowed with emission properties are part of these new materials. While the inorganic moieties provide emissivity, the organic part confers nanostructuration and processability. Here we describe how columnar arrangements can be obtained by assembling, via electrostatic interactions, isometric anionic inorganic nanoemitters, namely [Re6Se8(CN)6]4-, with imidazolium counter cations bearing triphenylene units. The resulting hybrids combine the emission of both components and energy transfer has been evidenced between both entities. Hole charge mobilities of the hybrid organic-inorganic columnar mesophases were also evaluated by the space charge limited current (SCLC) method.

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Section: Introductionmentioning

confidence: 78%

Ionic columnar clustomesogens: associations between anionic hexanuclear rhenium clusters and liquid crystalline triphenylene tethered imidazoliums

et al. 2018

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“…Today, liquid crystalline (LC) materials prove to have wide area of technological applications as optical displays, emitting-diodes, and photoconductors based on organic compounds [ 1 , 2 , 3 ]. Geometric characteristic relationships are important tools to synthesize a suitable structural shape to achieve the desired properties for specific industrial applications [ 4 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

New Nitro-Laterally Substituted Azomethine Derivatives; Synthesis, Mesomorphic and Computational Characterizations

et al. 2021

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Two new homologues series, based on two rings of the azomethine central group bearing the terminal alkoxy group of various chain lengths, were prepared. The alkoxy chain length varied between 6 and 16 carbons. The other terminal wing in the first series was the F atom, and the compound is named N-4-florobenzylidene-4-(alkoxy)benzenamine (In). The second group of compounds included a lateral NO2 substituent in addition to the terminal F atom, named N-(4-fluoro-3-nitrobenzylidene)-4-(alkyloxy)aniline (IIn). Mesomorphic and optical properties were carried out via differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Elemental analyses, FT-IR, and NMR spectroscopy were carried out to elucidate the molecular structures of the synthesized groups. Mesomorphic investigations indicated that all the synthesized homologues (In) were monomorphic, possessing the smectic A (SmA) phase monotropically, while the second group (IIn) members were non-mesomorphic. The experimental data indicated that the formation of the mesophase is affected by the protrusion of the lateral nitro group. The disruption of the mesophase in the second group was attributed to the increase of its molecular width, which affects its lateral intermolecular interactions. The computational simulations were in agreement with the experimental data. On the other hand, the location of NO2 group within the molecular geometry increased the melting temperature of the molecule, and thus, affected their thermal and physical properties. By discussing the estimated parameters, it was found that the molecular architecture, the dipole moment, and the polarizability of the investigated compounds are highly affected by the electronic nature and position of the terminal and lateral substituents as well as their volumes.

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“…It is in this context that we have been examining the structureproperty relations of columnar liquid crystals formed from discshaped molecules ("discotic mesogens"). These phases have been targeted for applications such as solar cells, [10][11][12][13][14][15] ferroelectrics, [16][17][18] and ionic conductive materials. [19][20][21] Our primary targets are dibenzophenazines, D(X,Y), which constitute a versatile family of discotic mesogens that tend to form columnar phases with wide temperature ranges.…”

Section: Introductionmentioning

confidence: 99%

Adjacent functional group effects on the assembly of columnar liquid crystals

Zellman

Williams

2020

Can. J. Chem.

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Although the impact of individual functional groups on the self-assembly of columnar liquid crystal phases has been widely studied, the effect of varying multiple substituents has received much less attention. Herein, we report a series of dibenzo[a,c]phenazines containing an alcohol or ether adjacent to an electron-withdrawing ester or acid. With one exception, these difunctional mesogens form columnar phases. The phase behavior appeared to be dominated by the electron-withdrawing substituent; transition temperatures were similar to derivatives with these groups in isolation. In most instances, the addition of an electron-donating group ortho to an ester or acid suppressed the melting temperature and elevated the clearing temperature, leading to broader liquid crystal thermal ranges. This effect was more pronounced for derivatives functionalized with longer chain hexyloxy groups. These results suggest a potential strategy for controlling the phase ranges of columnar liquid crystals and achieving room temperature mesophases.

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Thin films of discotic liquid crystals and their applications

Cited by 58 publications

References 50 publications

Ionic columnar clustomesogens: associations between anionic hexanuclear rhenium clusters and liquid crystalline triphenylene tethered imidazoliums

Ionic columnar clustomesogens: associations between anionic hexanuclear rhenium clusters and liquid crystalline triphenylene tethered imidazoliums

New Nitro-Laterally Substituted Azomethine Derivatives; Synthesis, Mesomorphic and Computational Characterizations

Adjacent functional group effects on the assembly of columnar liquid crystals

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