Liquid crystalline properties of dissymmetric molecules VI. The effect of alkyl chain length on molecular arrangement in the smectic A phase in three-aromatic-ring systems with two ester groups

2001 ◽  
Vol 28 (7) ◽  
pp. 1025-1034 ◽  
Author(s):  
Takeyasu Tasaka ◽  
Hiroaki Okamoto ◽  
Vladimir F. Petrov ◽  
Shunsuke Takenaka
Keyword(s):  
Aromatic Ring ◽  
Chain Length ◽  
Liquid Crystalline ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Ring Systems ◽  
Smectic A ◽  
Molecular Arrangement ◽  
Smectic A Phase

Miscibility Studies Indicating a Low Temperature Smectic A Phase in Biaromatic Liquid Crystals with Re-entrant Behaviour

1981 ◽  
Vol 36 (11) ◽  
pp. 1201-1204
Author(s):  
A. Göbl-Wunsch ◽  
G. Heppke ◽  
R. Hopf
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Chain Length ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Smectic A ◽  
Smectic A Phase ◽  
Miscibility Studies

Recent reports [1] have shown that compounds of the homologous series of the 4(4-n-alkyloxy- benzoyloxy)-4′-cyanoazobenzenes (Cn; n = 1 - 12), all have a low temperature smectic A phase (SA″). The homologues with alkyl chain length n≧9 exhibit in addition a high temperature smectic A phase (SA′), separated from the first one by a re-entrant nematic phase (N(re)). Homol­ogues of this series were used for miscibility studies with some compounds of the biaromatic liquid crystal series of the 4-cyano-4′-n-alkyloxybiphenyls (n̄ CBP) and of the 4-cyanobenzylidene- 4′-n-alkyloxyanilines (CN · n̄). The phase diagrams studied show that the smectic A phases of biaromatic liquid crystalline nitrile compounds correspond to the high temperature smectic SA′ type and are not miscible with the low temperature SA″ phase. Moreover, the shapes of the transition temperature curves to the SA″ phase indicate a low temperature smectic A phase (SA″) for the biaromatic compounds. This suggests that for biaromatic compounds with re-entrant behaviour, the dependence of liquid crystalline phase sequences on the alkyl chain length is very similar to that of triaromatic compounds.

THE EFFECT OF THE ALKYL CHAIN LENGTH ON THE LIQUID CRYSTALLINE PROPERTIES OF P-SUBSTITUTED CHOLESTERYL 4-BENZOYLBENZOATES

1981 ◽  
Vol 10 (2) ◽  
pp. 269-272 ◽  
Author(s):  
Mitsuhiro Koden ◽  
Tadao Yagyu ◽  
Shunsuke Takenaka ◽  
Hikaru Terauchi ◽  
Shigekazu Kusabayashi
Keyword(s):  
Chain Length ◽  
Liquid Crystalline ◽  
Alkyl Chain ◽  
Alkyl Chain Length

Synthesis and Phase Behaviors of New Heterocyclic Liquid Crystals: Nematic and Smectic Properties

2014 ◽  
Vol 699 ◽  
pp. 233-238 ◽  
Author(s):  
Kok Leei Foo ◽  
Sie Tiong Ha
Keyword(s):  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Phase Behaviour ◽  
Scanning Calorimetry ◽  
Smectic A ◽  
Lower Member ◽  
Smectic A Phase ◽  
Phase Behaviors ◽  
New Compounds ◽  
Mesomorphic Properties

A series of new rod-shaped liquid crystal, 6-methoxy-2-(4-alkyloxybenzylidenamino) benzothiazoles possessingeven numbers of carbon atoms at the alkyloxy chain (CnH2n+1O-, n = 10, 12, 14, 16, 18) are prepared and characterized. The phase behaviour of these new compounds was studied by differential scanning calorimetry and polarising optical microscopy. All members exhibited mesophase. Influence of alkyl chain length on the mesomorphic properties was studied. Enantiotropic nematic phase was identified in all the members except for n = 18. Lower member (n = 10) exhibited monotropic (metastable) smectic A phase. The enantiotropic smectic A phase was observed fromn-dodecyloxy derivatives onward to the last homologous synthesized.

scholarly journals Synthesis and Liquid Crystalline Properties of Unsymmetrically Substituted Naphthalenediimides with a Polar Headgroup: Effect of Amide Hydrogen Bonding and Alkyl Chain Length

ChemistryOpen ◽  
2017 ◽  
Vol 7 (1) ◽  
pp. 61-67 ◽  
Author(s):  
Namdev V. Ghule ◽  
Rajesh S. Bhosale ◽  
Sidhanath V. Bhosale ◽  
Turlapati Srikanth ◽  
Nandiraju V. S. Rao ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Chain Length ◽  
Liquid Crystalline ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Amide Hydrogen

4(4-Alkyloxybenzoyloxy)-4' -cyanoazobenzole: Eine homologe Reihe flüssigkristalliner Verbindungen mit der ungewöhnlichen Phasenfolge smektisch A-nematisch-smektisch A / 4(4-Alkyloxybenzoyloxy)-4'-cyanoazobenzenes: A Homologous Series of Liquid Crystals Exhibiting the Unusual Phase Sequence Smectic A -Nematic -Smectic A

1980 ◽  
Vol 35 (11) ◽  
pp. 1384-1388 ◽  
Author(s):  
Gerd Heppke ◽  
Reinhard Hopf ◽  
Bernd Kohne ◽  
Klaus Praefcke
Keyword(s):  
Phase Transition ◽  
Homologous Series ◽  
Nematic Phase ◽  
Liquid Crystalline ◽  
Alkyl Chain ◽  
Phase Region ◽  
Alkyl Chain Length ◽  
Smectic A ◽  
Phase Sequence ◽  
Phase Transition Temperatures

The synthesis and the phase transition temperatures of homologous liquid crystalline 4(4-alkyloxybenzoyloxy)-4'-cyanoazobenzenes with alkyl chain length n = 1-12 and n = 16 are reported. All compounds exhibit smectic A phases; the SA phase region being interrupted by a "re-entrant" nematic phase for alkyl chain lengath n ≥ 9.

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