Chiral Phases Induced by Doping Nonmesogenic Component into Mesogenic Esters

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

doi:10.1080/15421400390193927

Cited by 12 publications

(2 citation statements)

References 7 publications

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“…Mesomorphic behavior of mesogenic groups may be greatly modified upon the mixing of individual compounds. It is well known that forming a mixture of two or more liquid crystal components leads to tuning the needed properties of interest [24][25][26][27][28][29][30][31][32][33]. An example is the mixing of two non-mesomorphic compounds in order to reduce its melting point, which has gained wide use in many applications.…”

Section: Introductionmentioning

confidence: 99%

Binary Liquid Crystal Mixtures Based on Schiff Base Derivatives with Oriented Lateral Substituents

et al. 2020

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Binary mixtures of the laterally substituted Schiff base/ester derivatives, namely 4-((2- or 3-) substituted phenyl imino methyl) phenyl-4”-alkoxy benzoates, Ia–d, were prepared and mesomorphically studied by differential scanning calorimetry (DSC) and their mesophases identified by polarized optical microscopy (POM). The lateral group (1-naphthyl, 2-F, 2-Br, 3-F in Ia–d, respectively) is attached to different positions of the phenyl Schiff moiety. The mixtures investigated were made from two differently shaped compounds that differ from each other in the polarity, size, orientation, and relative positions of the lateral group. The results revealed that the binary mixture Ia/Ib (bearing the naphthyl and 2-flouro substituents) exhibited the SmA phase, which covered the whole composition range. For the mixtures Ib/Id (2-F and 2-Br), the isomeric lateral F-group in compound Ib distributed the SmA arrangement of Id. In the Ic/Id mixture bearing two positionally and structurally different substituents, the addition of Ic to Id resulted in solid binary mixtures where its behavior may be attributed to the negligible steric effect of the small electronegative fluorine atom compared to the Br atom. Density functional theory (DFT) theoretical calculations were carried out to estimate the geometrical parameters of individual components and to show the effect of these parameters in the mesophase behavior of the binary system, where the higher dipole moment of Id (6 Debye) may be the reason for its high π–π molecular stacking, which influences its mesophase range and stability.

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Section: Introductionmentioning

confidence: 99%

Binary Liquid Crystal Mixtures Based on Schiff Base Derivatives with Oriented Lateral Substituents

et al. 2020

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“…Mesomorphic criteria of mesogenic cores are greatly modified upon the mixing of individual components. Many reports [9][10][11][12][13][14][15][16][17][18][19][20] have been used to investigate the mesophase behavior upon the mixing of two or more compounds. On the other hand, dimeric LCs have been studied [7,8,[21][22][23][24] for the same applications.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Photophysical Studies of Binary Mixtures of Liquid Crystal with Different Geometrical Mesogens

et al. 2020

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Three binary systems were prepared by mixing of two different mesogenic derivatives, homologues, the first is azo/ester, namely 4-alkoxyphenylazo-4′-phenyl-4″-alkoxybenzoates (IIn+m) and the second is Schiff base/ester, namely 4-(arylideneamino)phenyl-4″-alkoxy benzoates (In+m). The two corresponding analogues from both series in the binary mixtures investigated are of the same terminal alkoxy chain length. Mesomorphic properties were investigated by differential scanning calorimetry (DSC) and phases identified by polarized optical microscope (POM). Photophysical studies were investigated by UV spectroscopy connected to a hot stage. Results were discussed based on constructed binary phase diagrams. All mixtures were found to exhibit eutectic compositions, with linear or slightly linear nematic and smectic A stability/composition dependences. Geometrical parameters were predicted applying density functional theory (DFT) calculations. Twist angle (θ), aspect ratio, dipole moment and the polarizability of the individual compounds were discussed and correlated with the experimental results to illustrate the enhanced the mesophase stability and the mesophase range of the mixture at the eutectic composition compared with those of their individual components.

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Thermal behavior of binary mixtures of isomers of different molecular structures and different lateral substituent positions

Ahmed

2016

J Therm Anal Calorim

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Chiral Phases Induced by Doping Nonmesogenic Component into Mesogenic Esters

Cited by 12 publications

References 7 publications

Binary Liquid Crystal Mixtures Based on Schiff Base Derivatives with Oriented Lateral Substituents

Binary Liquid Crystal Mixtures Based on Schiff Base Derivatives with Oriented Lateral Substituents

Thermal and Photophysical Studies of Binary Mixtures of Liquid Crystal with Different Geometrical Mesogens

Thermal behavior of binary mixtures of isomers of different molecular structures and different lateral substituent positions

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