Book ChapterDOI
New Liquid Crystalline Pyridine Derivatives
TLDR
A liquid crystalline phase formed by 2-alkyl-5-(4-alkoxyphenyl)-5 -alkylpyridines has been synthesized.Abstract:
Liquid crystalline 2-(4-alkoxyphenyl)-5-alkylpyridines have been synthesized. They exhibit more smectogeneous properties than analogous pyrimidine derivatives but their melting and clearing points are comparable with those of the latter. A liquid crystalline phase formed by 2-alkyl-5-(4-alkyl- or alkoxyphenyl)pyridines has a higher thermal stability than the same of isomeric 2-arylpyridines. These pyridine derivatives form exclusively smectic mesophases. A formation of pyridinic ring in synthesized compounds was accomplished by heteroatom exchange in pyrilium salts. A series of intermediate compounds, 2-(5-alkylthienyl-2)-5-arylpyridines in particular, form liquid crystals also.read more
Citations
More filters
Journal ArticleDOI
Synthesis of new schiff base ester liquid crystals with a benzothiazole core
TL;DR: A series of new calamitic liquid crystals, 6-methoxy-2-(4-alkanoyloxybenzylidenamino)benzothiazoles, comprising a benzothiazole core, terminal methoxy group and a Schiff base linkage were synthesized and characterised.
Journal ArticleDOI
Liquid crystalline 2,5-disubstituted pyridine derivatives
TL;DR: A review of the work on the molecular design of liquid crystalline 2,5-disubstituted pyridine derivatives for the twisted nematic (TN) and super-twisted nematic(STN) liquid crystal displays (LCDs) is presented in this article.
Journal ArticleDOI
Heterocyclic pyridine-based liquid crystals: synthesis and mesomorphic properties
TL;DR: A series of new calamitic liquid crystals, 4-{[pyridin-4-yl)methylidene]amino}phenyl 4-alkoxybenzoates comprising a heterocyclic (pyridine) and two phenyl rings core system, terminal alkoxy chain, was introduced in this article.
Patent
Smectic liquid crystal phases
Reinhard Hopf,Bernhard Scheuble,Reinhard Hittich,Joachim Krause,Volker Reiffenrath,Eike Poetsch,Thomas Geelhaar,Rudolf Dr Eidenschink +7 more
TL;DR: Trifluortoluol derivates have formula (I), in which R1 means alkyl with 1 to 12 C atoms, in which one or several non-adjacent CH2 groups may be substituted by -O-, -CO-, -O-CO-,
Journal ArticleDOI
Nitrogen-containing fused heterocycles as the structural fragments in calamitic liquid crystals
TL;DR: In this paper, the effect of nitrogen-containing fused heterocycles on the physicochemical properties of calamitic liquid crystals was examined in detail, and the results were compared with those obtained for other molecular fragments, and rationalized in terms of existent theories.
References
More filters
Journal ArticleDOI
The structure of smectic A phases of compounds with cyano end groups
TL;DR: In this article, the authors determined the smectic layer spacings (d) for a number of cyano derivatives which have an anomalous d/l ratio of ~ 1.4, where l is the molecular length.
Journal ArticleDOI
Elastic constants and molecular association of cyano‐substituted nematic liquid crystals
Hp. Schad,Maged A. Osman +1 more
TL;DR: In this article, the dielectric and elastic properties of cyano-substituted nematic liquid crystals are investigated in terms of molecular properties and molecular association, and the results are discussed in terms both molecular and molecular associations.
Journal ArticleDOI
Synthese niedrigschmelzender kristallin‐flüssiger Heterocyclen. I. 5‐n‐Alkyl‐2‐(4‐n‐alkoxy‐phenyl)‐pyrimidine
TL;DR: The Synthese der 5n-Alkyl-2-(4n-alkoxy-phenyl)-pyrimidine 6 nach zwei Varianten wird beschrieben as discussed by the authors.
Journal ArticleDOI
Liquid crystalline materials: physical properties and intermolecular interactions
TL;DR: The physical properties and the phase behaviour of some nematic liquid crystals are discussed, with emphasis on the influence of short-range antiparallel dipole correlation that occurs in mesogenic compounds with a strong terminal dipole moment as mentioned in this paper.