【Original Contribution】 Molecular Aggregation of Aqueous Carboxybetaines with Bulky Alkyl Chains: Formation of Vesicles and Lamellar Liquid Crystalline Aggregates

MEMBRANE ◽  
2011 ◽  
Vol 36 (6) ◽  
pp. 326-331
Author(s):  
Rika Homma ◽  
Seigo Sato ◽  
Sosaku Ichikawa
Keyword(s):  
Liquid Crystalline ◽  
Molecular Aggregation ◽  
Alkyl Chains ◽  
Original Contribution ◽  
Crystalline Aggregates

Influence of pendent alkyl chains on Heck and Sonogashira C–C coupling catalyzed with palladium(II) complexes of selenated Schiff bases having liquid crystalline properties

2014 ◽  
Vol 753 ◽  
pp. 42-47 ◽  
Author(s):  
Gyandshwar Kumar Rao ◽  
Arun Kumar ◽  
Mahabir Pratap Singh ◽  
Ajay Kumar ◽  
Ashok Manikrao Biradar ◽  
...  
Keyword(s):  
Schiff Bases ◽  
Liquid Crystalline ◽  
Alkyl Chains

Inosose-Flüssigkristalle / Inosose Liquid Crystals

1990 ◽  
Vol 45 (7) ◽  
pp. 1084-1090 ◽  
Author(s):  
Klaus Praefcke ◽  
Bernd Kohne ◽  
Andreas Eckert ◽  
Joachim Hempel
Keyword(s):  
Differential Scanning Calorimetry ◽  
Liquid Crystal ◽  
High Temperature ◽  
Liquid Crystalline ◽  
Structural Features ◽  
Lyotropic Liquid Crystal ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Alkyl Chains

Six S,S-dialkyl acetals 2a-f of inosose (1), tripodal in structure, have been synthesized, characterized and investigated by optical microscopy and differential scanning calorimetry (d.s.c.). The four S,S-acetals 2c-f with sufficiently long alkyl chains are thermotropic liquid crystalline; 2 e and 2 f are even dithermomesomorphic. Each of these four inosose derivatives 2c-f exhibits monotropically a most likely cubic mesophase (MI); in addition 2e and 2f show enantiotropically a hexagonal mesophase (Hx) with a non-covalent, supramolecular H-bridge architecture. Whereas the nature of the optically isotropic mesophase MI needs further clarification the stable high temperature mesophase Hx of 2 e and 2 f has been established by a miscibility test using a sugar S,S-dialkyl acetal also tripodal in structure and with a Hx phase proved by X-ray diffraction, but in contrast to 2 with an acyclic hydrophilic part. Similarities of structural features between the Hx-phases of 2e and 2f as well as of other thermotropic and lyotropic liquid crystal systems are discussed briefly.

scholarly journals The Role of Substitution in the Apex Position of the Bent-Core on Mesomorphic Properties of New Series of Liquid Crystalline Materials

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 735 ◽  
Author(s):  
Helena Skopalová ◽  
Petr Špaček ◽  
Václav Kozmík ◽  
Jiří Svoboda ◽  
Vladimíra Novotná ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Structural Parameters ◽  
Phase Identification ◽  
Crystalline Materials ◽  
X Ray ◽  
Alkyl Chains ◽  
Calorimetric Measurements ◽  
Liquid Crystalline Materials ◽  
Mesomorphic Properties

We present the synthesis and mesomorphic properties of the new series of bent-core liquid crystals based on 3-hydroxybenzoic acid bearing a lateral substituent in the apex position. Four different substituents of various sizes and electronic properties have been used. We have found that only compounds substituted with fluorine are mesogenic and exhibit one mesophase, whose type differs when prolonging the terminal alkyl chain. For homologues with shorter alkyl chains (octyl, decyl), a columnar B1-type of a mesophase was observed, while materials with longer terminal chains (dodecyl, tetradecyl) exhibited a switchable lamellar SmCAPA phase. Calorimetric measurements, texture observations under a polarizing microscope were performed and electro-optical properties studied. Additionally, dielectric measurements were realized to characterize the molecular dynamics in the SmCAPA phase. All mesogenic compounds were further studied by X-ray measurements to confirm phase identification and obtain more information about their structural parameters.

Switching of ionic conductivities in columnar liquid-crystalline anilinium salts: effects of alkyl chains, ammonium cations and counter anions on thermal properties and switching temperatures

2019 ◽  
Vol 4 (2) ◽  
pp. 342-347 ◽  
Author(s):  
Daniel Kuo ◽  
Bartolome Soberats ◽  
K. R. S. Kumar ◽  
Masafumi Yoshio ◽  
Takahiro Ichikawa ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Liquid Crystals ◽  
Liquid Crystalline ◽  
Ionic Conductivities ◽  
Molecular Structures ◽  
Switching Behavior ◽  
Alkyl Chains ◽  
Ion Conductivities ◽  
Thermal Switching

Effects of molecular structures on the thermal switching behavior of ion conductivities for columnar anilinium liquid crystals have been examined.

New possibility for an organic semiconductor: a smectic liquid crystalline semiconductor having a long conjugated core and two long alkyl chains

2005 ◽  
Vol 32 (7) ◽  
pp. 909-912 ◽  
Author(s):  
Yuichiro Haramoto ◽  
Yuko Kawada ◽  
Atushi Mochizuki ◽  
Masato Nanasawa ◽  
Seiji Ujiie ◽  
...  
Keyword(s):  
Organic Semiconductor ◽  
Liquid Crystalline ◽  
Alkyl Chains ◽  
Crystalline Semiconductor

scholarly journals X-Ray Diffraction Studies on Alicyclic Saturated Discotic Liquid Crystals

1987 ◽  
Vol 42 (6) ◽  
pp. 631-635 ◽  
Author(s):  
H. W. Neuling ◽  
H. Stegemeyer ◽  
K. Praefcke ◽  
B. Kohne
Keyword(s):  
Liquid Crystalline ◽  
Optical Observations ◽  
X Ray Diffraction ◽  
X Ray ◽  
Alkyl Chains ◽  
New Class ◽  
X Ray Scattering ◽  
Oriented Samples ◽  
Hexagonal Columnar

The discotic liquid crystalline phase of a new class of disc-like molecules (hexa-O-alkanoylscyllo- inositoles) is studied by small angle X-ray scattering, DSC and optical observations. Comparison of these three methods allows the determination of the structural arrangement. X-ray film exposures of oriented samples clearly demonstrate the hexagonal columnar ordered type of mesophases. A simple model calculation shows that the alkyl chains of neighbouring columns interpenetrate each other to a small extent.

Discotic liquid crystalline hexabenzocoronenes carrying chiral and racemic branched alkyl chains: supramolecular engineering and improved synthetic methods

Tetrahedron ◽  
2001 ◽  
Vol 57 (17) ◽  
pp. 3769-3783 ◽  
Author(s):  
Andreas Fechtenkötter ◽  
Natalia Tchebotareva ◽  
Mark Watson ◽  
Klaus Müllen
Keyword(s):  
Liquid Crystalline ◽  
Synthetic Methods ◽  
Alkyl Chains
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