Journal ArticleDOI
Synthesis and Mesomorphic Properties of New Methylene-Linked Linear Symmetrical Liquid Crystal Dimers
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In this paper, a series of methylene-linked symmetrical liquid crystal dimers were synthesized and their structures were confirmed by physicochemical techniques, including differential scanning calorimetry and polarizing optical microscopy.Abstract:
A series of methylene-linked symmetrical liquid crystal dimers were synthesized. Their structures were confirmed by physicochemical techniques. Differential scanning calorimetry and polarizing optical microscopy verified the liquid crystal behaviors and their transition temperatures. The thermodynamic data for phase transition, melting transition (Tm), and isotropic transition temperatures (Ti) of the dimers were decreased with increasing the length of spacer. Both Tm and Ti and enthalpy change for isotropic transition (δHi) for dimers with even numbers of methylene units were higher than those with odd numbers. Dimers AC-OnO-AC (n = 2–10) formed enantiotropic nematic phase only, while the unsymmetrical dimer formed a smectic phase.read more
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New azo-benzothiazole based liquid crystals: synthesis and study of the effect of lateral substituents on their liquid crystalline behaviour
TL;DR: New azo-phenylbenzothiazole moiety-based liquid crystals with diverse substituents/groups (H, OH, CH3, Cl, F) at position-3 of the central benzene ring were prepared and characterised.
Journal ArticleDOI
Symmetrical and asymmetrical liquid crystal dimers: synthesis, characterisation and mesomorphic behaviour
TL;DR: A series of new asymmetrical liquid crystal dimers, RnO-S2O-ORn (n = 2−10), linked by an ethylene spacer having carbothiol and carboxyl linkages to the core centre of the mo...
Journal ArticleDOI
Optical nonlinear properties and all optical switching in a synthesized liquid crystal
Uhood J. Al-Hamdani,Qusay M.A. Hassan,Ahmed M. Zaidan,H.A. Sultan,Kawkab Ali Hussain,Chassib A. Emshary,Zainab Alabdullah +6 more
TL;DR: A liquid crystal (LC) type 4-((4-(benzothiazol-2-yl) phenyl) diazenyl) −3-hydroxyphenyl 4-methoxybenzoate (E-OCH3) is synthesized and characterized using 1H NMR, mass spectra and DSC thermo gram Marble and Schlieren textures as mentioned in this paper .
Journal ArticleDOI
Synthesis, mesomorphic properties, and theoretical study of benzothiazole-aromatic molecules with ester- and azomethine-linking groups
TL;DR: Two rod-like molecules with benzothiazole-aromatic systems are presented in this paper, one group (group A) having an ester linkage with different thioalkyl chain length and the other (group B) ester-and azom...
Journal ArticleDOI
Synthetic pathway for a new calamitic series of liquid crystal: Comparison with corresponding linkage group
TL;DR: Two homologous series based on three linking groups have been synthesized and characterized by elemental analyses and spectroscopic techniques such as Fourier transform infrared [FT-IR] and protonm... as mentioned in this paper.
References
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Journal ArticleDOI
Liquid crystal dimers and higher oligomers: between monomers and polymers
TL;DR: The underlying theme of this Critical Review is the relationship between molecular structure and liquid crystalline behaviour in a class of materials referred to as liquid crystal oligomers, and how this molecular architecture has been exploited to address issues in a range of quite different areas and has given rise to potential applications for these materials.
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Smectogenic dimeric liquid crystals. The preparation and properties of the α,ω-bis(4-n-alkylanilinebenzylidine-4′-oxy)alkanes
TL;DR: In this article, the α,ω-bis (4n-alkylanilinebenzylidine-4′-oxy)alkanes have been synthesized and their transitional properties characterized.
Journal ArticleDOI
Methylene-linked liquid crystal dimers
TL;DR: A range of symmetric liquid crystal dimers which differ in the nature of the link, either ether or methylene, between the spacer and mesogenic units has been prepared and their transitional properties characterized as discussed by the authors.
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Methylene‐ and ether‐linked liquid crystal dimers II. Effects of mesogenic linking unit and terminal chain length
TL;DR: In this article, four series of liquid crystal dimers have been prepared containing either ether-linked or methylene-linked spacers, and the entropy change associated with the nematic-isotropic transition is higher for an even-membered methylene−linked dimer than for the corresponding ether−linked material.