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

Bhagavath, Poornima; Mahabaleshwara, S.; Bhat, Sangeetha G.; Potukuchi, D. M.; Shetty, Prakash; Srinivasulu, M.

doi:10.1016/j.molliq.2021.116313

Cited by 6 publications

(5 citation statements)

References 34 publications

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“…The alkoxy chain length dependence of the rotational viscosity showed that γ strongly depended to the molecular density. This behavior has been observed in several instances suggesting that the longer chain length liquid crystal molecules reduces the molecular density [2,19,41]. Moreover, this result provides better insight into the dependence of the response time on the alkyl chain length.…”

Section: Viscoelastic Propertiessupporting

confidence: 54%

“…Thermotropic liquid crystals (LCs) have received special attention because of their interesting anisotropic optical and electrical properties. Hydrogen-bonded liquid crystals (HBLCs) are known for their high thermal stability and rich polymorphism [1][2][3][4]. Since the first report of the phase behavior of the n-alkoxy benzoic acids LCs formed via hydrogen bonding [5], much research work has been made in the synthesis, phase behavior and properties of this class of LCs.…”

Section: Introductionmentioning

confidence: 99%

“…NMR (101 MHz, CDCl3),  (ppm from TMS):13.92, 22.56, 25.74, 28.94, 29.12, 29.20, 29.38, 31.78, 70.10, 108.62 (d, 3 JC-F = 2.83 Hz), 110.96 (d,2 JC-F = 7.06 Hz), 127.10 (d,3 JC-F = 3.98 Hz), 141.61 (dd, 1 JC-F = 248 Hz, 2 JC-F = 14.1 Hz), 152.15 (dd, 1 JC-F = 262 Hz, 2 JC-F = 11.5 Hz), 153.38 (dd, 2 JC-F = 7.85 Hz,3 JC-F = 3.66 Hz), 168.04 (t,3 JC-F = 3.04 Hz,4 JC-F = Hz, 5 JH-F = 2.3 Hz).…”

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confidence: 99%

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Synthesis, thermal, dielectric and electro-optic properties of new series of fluorinated hydrogen-bonded liquid crystals

Derbali

Soltani

Guesmi

et al. 2022

Journal of Molecular Liquids

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Section: Viscoelastic Propertiessupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Synthesis, thermal, dielectric and electro-optic properties of new series of fluorinated hydrogen-bonded liquid crystals

Derbali

Soltani

Guesmi

et al. 2022

Journal of Molecular Liquids

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“…Variation of mesophase temperature ranges of the different observed textures for the mesomorphic compounds bearing the biphenyl group rather than 4-phenyl pyridine ends in their mesogens. SmX1 and SmA were identified by the authors in [40] for samples 3.c, 3.d and 3.e as SmX1 and SmA, respectively.…”

Section: Dft Calculationsmentioning

confidence: 97%

“…Phase transitions: Temperatures (T, • C), enthalpies (∆H, kJ/mol) and mesomorphic range (∆T) for the prepared compounds 3.b-3.h. SmX1 was identified by the authors in[40] as SmB for samples 3…”

mentioning

confidence: 99%

Mesomorphic Behaviour and DFT Insight of Arylidene Schiff Base Liquid Crystals and Their Pyridine Impact Investigation

et al. 2021

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A new series of Schiff base liquid crystal have been prepared and studied. Schiff bases of p-alkyl aniline derivatives and 4-phenyl pyridine-4′-carbaldehyde were prepared. The terminal alkyl groups substituting aniline are of varied chain length, namely C8, C12 and C14. The structures of the compounds were elucidated by 1H NMR and 13C NMR. The mesomorphic thermal and optical characteristics of the samples were determined via differential thermal analysis (DSC) and polarization optical microscopy (POM). All compounds exhibit enantiotropic dimorphic mesophase behaviour, referred to as smectic X1 (SmX1) and smectic X2 (Sm A). Experimental results obtained for the mesophases were correlated with density functional theory (DFT) theoretical calculations. The results of the new series are further compared to two series of compounds bearing pyridine (two ring Schiff bases) and biphenyl, respectively, in their mesogens. The series of compounds of one pyridine ring are generally not mesomorphic. The results indicate that the alkyl chain length has a strong impact on the mesomorphic characteristics and thermal stabilities of the different mesophases. As a trend, the temperature ranges of both of smectic mesophases of all compounds are higher in new compounds bearing the 4-phenyl pyridine moiety. In addition, the total mesophase range is generally higher in the new compounds when compared to their biphenyl analogues. Finally, theoretical DFT calculations were performed to illustrate the experimental finding of the mesomorphic behaviour in terms of the molecular geometry and aromaticity, π–π stacking and LOL-π.

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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

Cited by 6 publications

References 34 publications

Synthesis, thermal, dielectric and electro-optic properties of new series of fluorinated hydrogen-bonded liquid crystals

Synthesis, thermal, dielectric and electro-optic properties of new series of fluorinated hydrogen-bonded liquid crystals

Mesomorphic Behaviour and DFT Insight of Arylidene Schiff Base Liquid Crystals and Their Pyridine Impact Investigation

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

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