Chiral Phases Induced by Doping Nonmesogenic Component Into Mesogenic Esters

Dave, Jayrang S.; Menon, Meera; Patel, Pratik

doi:10.1080/10587250216183

Cited by 2 publications

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“…Decrement of the melting temperatures of the LCs and broadening their mesophase range are important goals for many practical applications. One way to achieve a low melting point is the mixing of compounds possessing various molecular shapes and characteristics in binary systems [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. The mesomorphic properties are greatly modified upon the mixing of individual components.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Mesomorphic and Computational Characterizations of Nematogenic Schiff Base Derivatives in Pure and Mixed State

et al. 2021

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Homolog series based on three aromatic rings bearing terminal alkoxy chain of various lengths named 4-(4-(alkoxy)phenylimino)methyl)phenyl nicotinate (An) were synthesized. The alkoxy-chain length changed between 6, 8 and 16 carbons. 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 prepared derivatives. Mesomorphic results indicated that all the synthesized homologs (An) are monomorphic possessing the nematic (N) phase enantiotropically with wide thermal stability. Computational simulations were measured via density functional theory (DFT) theoretical calculation tool. The estimated thermal and geometrical parameters are in agreement with the experimental data. By discussing the estimated parameters, it was found that the molecular architecture, dipole moment and the polarizability of the investigated compounds are highly affected by the length of the attached terminal flexible chain and the location of the nitrogen atom in the other terminal aromatic ring. Binary phase diagrams of two corresponding homologs with different proportionating terminals were constructed, and their binary phase physical properties were discussed in terms of the temperature range and stability of the N phase.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Mesomorphic and Computational Characterizations of Nematogenic Schiff Base Derivatives in Pure and Mixed State

et al. 2021

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“…The mixtures of LC show mesophase transitions and thermal properties that differ from their individual components. Mixing of two or more LC components leads to tuning the needed characteristics of interest [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. Moreover, the binary LC mixtures could be better established for many fields in certain applications [ 43 ].…”

Section: Introductionmentioning

confidence: 99%

Optical and Thermal Investigations of New Schiff Base/Ester Systems in Pure and Mixed States

et al. 2021

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New mesomorphic series, 4-hexadecyloxy phenyl-imino-4′-(3-methoxyphenyl)-4″-alkoxybenzoates (An), were prepared and investigated with different thermal and mesomorphic techniques. The synthesized homologous series constitutes four members that differ from each other in the terminal length of flexible chain (n) attached to phenyl ester moiety, which varies between n = 6, 8, 10, and 12 carbons. A lateral CH3O group is attached to the central benzene ring in the meta position with respect to the ester moiety. Molecular structures of all newly prepared homologues were elucidated via FT-IR, 1H and 13C NMR spectroscopy. Mesomorphic and thermal properties were examined by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and the mesophases identified by polarized optical microscopy (POM). DSC and POM examinations revealed that all members of the present series (An) exhibit a purely enantiotropic nematic (N) phase. Comparative evaluations and binary phase diagrams were established between the present homologues and their corresponding shorter one (Bn). The examination revealed that, the length of the flexible alkoxy chain incorporated into the phenylimino moiety is highly effective on the temperature range and stability of the mesophase observed. With respect to the binary mixtures An/Bn, the exhibited N phase showed to cover the whole composition range with eutectic behavior.

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Chiral Phases Induced by Doping Nonmesogenic Component Into Mesogenic Esters

Cited by 2 publications

References 0 publications

Synthesis, Mesomorphic and Computational Characterizations of Nematogenic Schiff Base Derivatives in Pure and Mixed State

Synthesis, Mesomorphic and Computational Characterizations of Nematogenic Schiff Base Derivatives in Pure and Mixed State

Optical and Thermal Investigations of New Schiff Base/Ester Systems in Pure and Mixed States

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