Enhanced conductivity in nanoparticle doped hydrogen bonded binary mixture

Pai, Pavitra; Kulkarni, Suresh D.; Srinivasulu, M.; Baral, Marlin; Apoorva, M.M.; Bhagavath, Poornima

doi:10.1016/j.molliq.2019.111754

Cited by 4 publications

(1 citation statement)

References 24 publications

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“…The phase transition temperatures and the textures of the LC phases in these H-bonded heterodimers were found to be dependent on the identities of the H-bond donors and acceptors [19,21,[26][27][28]. In addition, pyridine-based supramolecular H-bonded LCs have attracted the interest of many researchers in the past two decades for various systems [29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Pyridine-Based Three-Ring Bent-Shape Supramolecular Hydrogen Bond-Induced Liquid Crystalline Complexes: Preparation and Density Functional Theory Investigation

2021

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A series of new supramolecular three-ring bent-shape Schiff base liquid crystal (LC) complexes were prepared and studied. On one side, two alkoxy chain lengths of the carboxylic acids were used, namely eight and sixteen carbons. Moreover, on the other side, terminal small compact groups, which substituted aniline, with different polarities were utilized. Furthermore, the hydrogen-bonding interactions in the formed complexes were elucidated by Fourier-transform infrared (FT–IR) spectroscopy. The mesomorphic thermal and optical characteristics of the samples were determined by differential thermal analysis (DSC) and polarized optical microscopy (POM). The complexes exhibited enantiotropic and dimorphic mesophase behaviors. The results indicate that the polarity of the compact groups and the lengths of the alkoxy chains greatly impacted the mesomorphic characteristics and thermal stabilities of the mesophases. The observed values of the enthalpy changes (ΔH) associated with the crystalline smectic-A (TCr-SmA) transitions were extremely small compared with the conventional values that characterize supramolecular hydrogen-bonded liquid crystalline complexes. ΔH, which corresponded to the nematic isotropic transitions (TN-I), varied from 0.13 to 9.54 kJ/mol depending mainly on the polarity of the groups that were para-attached to the aniline moiety. Finally, the theoretical results obtained by density functional theory (DFT) calculations were discussed. The DFT geometrical structures showed non-coplanar structures. The mesomorphic range was correlated with the calculated dipole moment, polarizability and the aspect ratios of the investigated compounds.

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Section: Introductionmentioning

confidence: 99%

Pyridine-Based Three-Ring Bent-Shape Supramolecular Hydrogen Bond-Induced Liquid Crystalline Complexes: Preparation and Density Functional Theory Investigation

2021

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Mesomorphic thermal stabilities and nonlinear optical properties of fluorine containing liquid crystals

Kumari,

Bhattacharjee,

Sonali

et al. 2024

Discov Appl Sci

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H-bonded liquid crystals (HBLCs) are newly synthesized with PyBF viz., (4-pyridyl)-benzylidene-4′-fluoro aniline as the proton acceptor which is non-mesogenic and alkyloxy benzoic acids viz., nOBAs (n = 3, 12) as the mesogenic proton donors. The H-bond formed is confirmed by FTIR spectroscopy. Polarizing Optical Microscopy confirmed the H-bonded compound’s mesomorphic textures, and the thermal analysis is carried out using a Differential Scanning Calorimeter. The influence of fluorine atom on mesomorphic stability is studied. The nonlinear optical properties of the H-bonded compound is studied using DFT theoretical approach. This work supports the SDG-9 of the United Nations. Graphical abstract

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Influence of polar substituents and flexible chain length on mesomorphism in non-mesogenic linear hydrogen bonded complexes

Bhagavath

Mahabaleshwara

Bhat

et al. 2021

Journal of Molecular Liquids

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Enhanced conductivity in nanoparticle doped hydrogen bonded binary mixture

Cited by 4 publications

References 24 publications

Pyridine-Based Three-Ring Bent-Shape Supramolecular Hydrogen Bond-Induced Liquid Crystalline Complexes: Preparation and Density Functional Theory Investigation

Pyridine-Based Three-Ring Bent-Shape Supramolecular Hydrogen Bond-Induced Liquid Crystalline Complexes: Preparation and Density Functional Theory Investigation

Mesomorphic thermal stabilities and nonlinear optical properties of fluorine containing liquid crystals

Influence of polar substituents and flexible chain length on mesomorphism in non-mesogenic linear hydrogen bonded complexes

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