Synthesis and mesomorphic properties of two series of new azine‐type liquid crystals

Wang, Qiang; Song, Lin; Cao, Hui; Wang, Liping; Yang, Huai; Wang, Yangbin

doi:10.1080/02678290802028773

Cited by 27 publications

(7 citation statements)

References 17 publications

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“…Some azines that are liquid crystal (LC) compounds were also investigated. [54][55][56][57] They have been studied for their possible application in twisted-nematic displays. 58 However, most studies on azines focused mainly on the analysis of their crystal structures and their dipolar properties because these issues are crucial in the design and understanding of NLO-active molecules.…”

Section: Lc Propertiesmentioning

confidence: 99%

“…3,59 Azines undergo photochemical E/Z isomerization of the C]N bonds to produce (E/Z) and (Z/Z) isomers from the thermodynamically most stable (E/E) form. 56 The conformation of aromatic azines is controlled by a chain of four atoms: C]N-N]C. Almost all studied aromatic azines exist in the preferred (E,E) conguration in which the large groups attached to the C]N bonds are trans to the N-N bond (Fig. 5).…”

Section: Isomerizationmentioning

confidence: 99%

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Structure, synthesis and application of azines: a historical perspective

2014

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Section: Lc Propertiesmentioning

confidence: 99%

Section: Isomerizationmentioning

confidence: 99%

Structure, synthesis and application of azines: a historical perspective

2014

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“…Distance for wide angle is 4.5 Å which is the typical values (4.4 to 4.6 Å) for calamitic mesophase. It also means that there is no regular intermolecular distance inside the layers, which confirmed is smectic A phase 27 . In addition, d-layer spacing (31.1 Å) was found to be larger than molecular length (31.4 Å) predicted by MM2 molecular calculation.…”

Section: Resultsmentioning

confidence: 96%

Mesomorphic Properties and X-Ray Diffraction Studies of 4-Alkanoyloxybenzylidene-4'-fluoroaniline

Lee

et al. 2014

Asian J. Chem.

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Liquid crystals (LCs) are known as fourth state of matter, which own the anisotropic properties of crystals as well as fluid properties of liquids. It was first reported by Otto Lehman in 1889 after he investigated the double-melting points phenomenon of molten cholesteryl benzoate 1. The self-assembly properties of liquid crystals play a significant role in producing specific properties to a particular phase. This gives different order parameters in different mesophases 2. Liquid crystals found to be applied in display technology, advanced technological devices and prototypical self-organizing molecular materials 3. A minor structure modification results a great effect on the mesomorphic property. Therefore, in order to prepare a new mesogen with desirable property and application, it is essential to understand chemical structure-mesomorphic property relationships 4. Low-mass calamitic liquid crystals consisting of two aromatic rings with at least one terminal substituent, for instance, 4-methoxybenzylidene-4'-butylaniline (MBBA), are capable of showing liquid crystal properties 5,6. The discovery of 4-methoxybenzylidene-4'-butylaniline has sparked a renewed interest of researcher on Schiff bases due to its room temperature nematic phase 7-12 .

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“…(E)-4-((4-ethoxybenylidene) amino) phenol (B) was prepared by an established method [25] M.P.196 o C, Yield-69.2 %. Coupling of compound A and compound B is done by steglichesterification to yield p-(p'-n-alkoxy cinnamoyloxy)-(p"-ethoxy benzylidene) aniline [26]. SciPress applies the CC-BY 4.0 license to works we publish: https://creativecommons.org/licenses/by/4.0/…”

Section: Experimental Synthesismentioning

confidence: 99%

Mesomorphism Molecular Rigidity and Flexibility

Dudhagara

Bhola

Bhoya

2015

ILCPA

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A novel homologous series of liquid crystalline (LC) behaviors of Schieff’s bases: RO-C6H4-CH=CH-COO-C6H4-N=CH-C6H4-OC2H5 have been synthesized and studied with a view to understand and establish the effect of molecular structure on LC properties of a novel substances. The members of a novel series are enantiotropically nematogenic (C1 to C10) or the some of the homologues (C12 to C18) are smectogenic phase nematogenic. Transition temperatures, textures and melting behaviors observed or determined by an optical polarizing microscopy equipped with a heating stage. Thermometric temperatures are varied between 102 °C and 311 °C. Textures of the nematic phases are threaded or schlieren and that of the smectic phases are of the type A or C. Smectic and nematic thermal stabilities are 122.5 °C and 270.7 °C. Total mesophase lengths vary from 111.0 °C to 194.0 °C. Analytical and spectral data confirms the molecular structures of homologues. Some LC properties o present novel series are compared with the structurally similar known series. Transition curves viz. Cr-M, Sm-N and N-I behaved in normal manner. N-I transition curve exhibited odd-even effect. Thus present novel series is partly smectogenic and fully nematogenic with high mesophase length and higher observed melting type

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Synthesis and mesomorphic properties of two series of new azine‐type liquid crystals

Cited by 27 publications

References 17 publications

Structure, synthesis and application of azines: a historical perspective

Structure, synthesis and application of azines: a historical perspective

Mesomorphic Properties and X-Ray Diffraction Studies of 4-Alkanoyloxybenzylidene-4'-fluoroaniline

Mesomorphism Molecular Rigidity and Flexibility

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