Coumarin Schiff base-esters liquid crystals with symmetrical and unsymmetrical alkoxy chains: Synthesis, mesomorphic properties and DFT approach

Katariya, Kanubhai D.; Nakum, Kiran J.; Soni, Rina; Soman, Shubhangi S.; Hagar, Mohamed

doi:10.1016/j.molliq.2022.119073

Cited by 28 publications

(2 citation statements)

References 39 publications

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“…It has been shown previously that the introduction of such asymmetry in metallomesogens is a viable strategy to improve the supramolecular ordering of the mesophase in terms of both a lower steric hindrance among the chains of neighbouring molecules and a reinforcement of the dipole–dipole interactions among them. 17–19 It is shown here that the compounds synthesized combine (i) the effect of the stabilisation of the mesophase due to the presence of the isoquinoline group and (ii) the effect of lowering the melting temperature due to the existence of molecular asymmetry.…”

Section: Introductionmentioning

confidence: 92%

Improving the mesomorphism in bispyrazolate Pd(ii) metallomesogens: an efficient platform for ionic conduction

2023

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Section: Introductionmentioning

confidence: 92%

Improving the mesomorphism in bispyrazolate Pd(ii) metallomesogens: an efficient platform for ionic conduction

2023

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“…Different azomethine/ester homologous series of liquid crystals (LCs) have been thoroughly researched to appreciate the relation between chemical structure and mesomorphic attributes because of their unique mesomorphic properties [ 37 , 38 , 39 , 40 , 41 ]. An organic molecule’s molecular shape generally affects the mesophase stability and temperature ranges it can withstand; even a little alteration in molecular geometry can have a significant impact on mesomorphic behavior [ 42 ].Moreover, the Schiff base (azomethine group) serves as a connecting group within the molecule’s rigid core. The azomethine group maintains molecular linearity despite having a stepped core structure, making the molecule more stable and enabling the evolution of mesophase [ 43 , 44 , 45 , 46 , 47 , 48 ].…”

Section: Introductionmentioning

confidence: 99%

Novel Imidazole Liquid Crystals; Experimental and Computational Approaches

et al. 2022

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The liquid crystalline materials named (E)-4-(2-(4-oxo-5,5-diphenyl-4,5-dihydro-1H-imidazol-2-yl)hydrazineylidene)methyl)phenyl and 4-(alkoxy)benzoate, In, were synthesized and their mesomorphic behaviors were examined. The chemical structures of the produced compounds were confirmed by Fourier-transform infrared spectroscopy (FT-IR), NMR, and elemental analysis. Differential scanning calorimetry (DSC) and polarized optical microscopy were used to investigate the mesomorphic properties of designed heterocyclic derivatives. All the compounds tested had suitable thermal stability and enantiotropic behavior of smectogenic temperature ranges. Furthermore, the enantiotropic smectic C phases were observed to cover all the homologues. Moreover, computational investigations corroborated the experimental findings of the mesomorphic behavior. The reactivity parameters were computed for the derivatives and linked with the experimental data. Theoretical calculations revealed that the polarizability of the studied series increases with the chain length, whereas the HOMO–LUMO energy gap or other reactivity descriptors were less sensitive to the size of the system. On the other hand, the predicted thermodynamic parameters revealed the size dependence of thermal stability of the compounds.

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Amphiphilic ligand‐doped liquid crystal‐based detection of Hg²⁺ ions on polyimide surface with alkyl pendent groups

Majeed,

Siddiqi,

Urooj

et al. 2024

Polymer International

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In this study, amphiphilic thiosemicarbazone was used to align liquid crystal (4‐cyano‐4′‐pentylbiphenyl) in a homeotropic way on polyimide containing alkyl pendent groups (AHDPI), which was coated on a glass slide. The amphiphilic ligands 2‐(4‐(dodecyloxy)benzylid‐ene)hydrazine‐1‐carbothioamide (DT) and 2‐(1‐dodecyl‐2‐oxoindolin‐3‐ylidene)hydrazine‐1‐carbothioamide (IT) were doped with liquid crystal (LC) to develop LC‐based sensors to detect Hg2+ ions in water. The selective interaction of carbothioamide with Hg2+ ions triggered the orientation transition of LC from homeotropic to parallel alignment and gave dark to bright optical signal at the LC/aqueous interphase. Self‐immobilization of thiosemicarbazone‐based ligands on AHDPI‐coated glass slide can be used to detect Hg2+ ions with high sensitivity. The limit of detection with DT and IT was found to be 0.5 and 0.25 μmol L−1, respectively. Density functional studies were carried out to study the interaction of the thiosemicarbazone ligands with mercuric ions, resulting in highly negative binding energies of −1.55 and −2.06 eV for DT and IT with Hg2+ ions, respectively. The chemical and thermal stability (up to 268 °C) of the AHDPI coated on glass slide made it reusable at least twice for sensor fabrication. This provides a quicker and cheaper alternative to traditional methods of sensor fabrication. © 2024 Society of Chemical Industry.

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Coumarin Schiff base-esters liquid crystals with symmetrical and unsymmetrical alkoxy chains: Synthesis, mesomorphic properties and DFT approach

Cited by 28 publications

References 39 publications

Improving the mesomorphism in bispyrazolate Pd(ii) metallomesogens: an efficient platform for ionic conduction

Improving the mesomorphism in bispyrazolate Pd(ii) metallomesogens: an efficient platform for ionic conduction

Novel Imidazole Liquid Crystals; Experimental and Computational Approaches

Amphiphilic ligand‐doped liquid crystal‐based detection of Hg²⁺ ions on polyimide surface with alkyl pendent groups

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Coumarin Schiff base-esters liquid crystals with symmetrical and unsymmetrical alkoxy chains: Synthesis, mesomorphic properties and DFT approach

Cited by 28 publications

References 39 publications

Improving the mesomorphism in bispyrazolate Pd(ii) metallomesogens: an efficient platform for ionic conduction

Improving the mesomorphism in bispyrazolate Pd(ii) metallomesogens: an efficient platform for ionic conduction

Novel Imidazole Liquid Crystals; Experimental and Computational Approaches

Amphiphilic ligand‐doped liquid crystal‐based detection of Hg2+ ions on polyimide surface with alkyl pendent groups

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Product

Resources

About

Amphiphilic ligand‐doped liquid crystal‐based detection of Hg²⁺ ions on polyimide surface with alkyl pendent groups