Azomesogens with a heterocyclic moiety

Dave, Jayrang S.; Menon, Meera

doi:10.1007/bf02719917

Cited by 50 publications

(27 citation statements)

References 3 publications

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“…The increased dipole moment enhances the stability of the lattice and melting temperatures [14]. As the length of the terminal substituent increases, the molecules tend to orientate in a parallel arrangement [15].…”

Section: Introductionmentioning

confidence: 99%

Schiff Base liquid Crystals with Terminal Alkoxy Group Synthesis and Thermotropic Properties

Jber

Shukur

Najaf

2017

JNUS

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A new homologous series of Schiff base esters comprising a terminal alkoxy substituent N-{(nalkoxy-4``-bezoyloxy)-4`-benzylidene}-4-butyl aniline was studied. The alkyloxy substituent contributes to the molecular polarizability, thus, affecting intermolecular interactions, hence, resulting in nematic polymorphism. The mesomorphic properties were studied using polarizing optical microscope (POM). The lower members, n-methoxy and n-ethoxy derivatives were nonmesogens, enantiotropic nematogenic phase was observed on further lengthening of the alkyl chain from C3 to C6 and smectogenic phase was observed for compounds C7 and C8. FT-IR, 1 HNMR, 13 CNMR, EI-MS and elemental analysis were employed to elucidate the molecular structure of the title compounds whereas the liquid crystal properties were determined by POM analysis. The mesomorphic behaviors of the homologous compounds are rationalized based on the varying lengths of the alky chain.

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Section: Introductionmentioning

confidence: 99%

Schiff Base liquid Crystals with Terminal Alkoxy Group Synthesis and Thermotropic Properties

Jber

Shukur

Najaf

2017

JNUS

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“…The increased dipole moment enhances the stability of the lattice and melting temperatures [7]. As the ionic radius of the terminal substituent increases, the molecules tend to orientate in a parallel arrangement [22]. Thus, smectic polymorphism is not unusual for mesogens with a terminal halogen substituent, and this has been frequently observed as the length of the alkyl or alkoxy chains increases [20,23].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Mesomorphic Properties of New Fluorinated Schiff Base Liquid Crystals

Lee

2014

ISRN Materials Science

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Two new compounds, 4-alkanoyloxybenzylidene-4 -fluoroaniline and 4-fluorobenzylidene-4 -n-alkanoyloxyaniline comprising a terminal fluorosubstituent were studied. The fluoro substituent contributes to the molecular polarizability, thus affecting intermolecular interactions and hence resulting in smectic mesomorphism. The mesomorphic properties were studied using differential scanning calorimetry and polarizing optical microscopy techniques. The mesomorphic properties of compounds studied are strongly dependent on the orientation of the imine (CH=N) linkage. The former Schiff base exhibited smectic A phase whereas the latter compound did not display any mesophase. Reversed imine linkage has caused depression of mesomorphic property in the compound studied (4-fluorobenzylidene-4 -n-alkanoyloxyaniline). The mesomorphic properties of the present compounds were compared with other structurally related series to establish the chemical structure-mesomorphic property relationship.

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“…Many mesogenic compounds containing heterocyclic rings such as pyridine, pyrimidine, furyl, thiazole, thiadiazole and oxadiazole have been reported in the literature [1][2][3][4][5][6][7]. Significant interest in mesomorphic heterocyclic compounds [2] has dramatically increased due to their more diversified structural figures and distinct mesomorphic properties.…”

Section: Introductionmentioning

confidence: 99%

Mesogenic quinazolone derivatives: synthesis and characterisation

Prajapati

Modi

2010

Liquid Crystals

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Two new mesogenic homologous series of quinazolone derivatives have been synthesised by condensation of 4-n-alkoxybenzoyloxy benzaldehyde (for series I) / 4-n-alkoxy-3-methoxybenzoyloxy benzaldehyde (for series II) with 3-amino-2-methyl quinazolone in alcohol. The synthesised compounds are characterised by a combination of elemental analysis and standard spectroscopic methods. In series I, all the synthesised members exhibit the nematic mesophase. An enantiotropic smectic A phase is observed from the n-decyloxy derivative onward to the last homologue synthesised. Methoxy to n-propyloxy derivatives of series II are non-mesogenic, whereas the rest of the members exhibit a monotropic nematic mesophase. The mesomorphic properties of the present series I and II are compared with each other and with the other structurally related mesogenic homologous series to evaluate the effect of lateral methoxy substituent and quinazolone moiety on mesomorphism.

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Azomesogens with a heterocyclic moiety

Cited by 50 publications

References 3 publications

Schiff Base liquid Crystals with Terminal Alkoxy Group Synthesis and Thermotropic Properties

Schiff Base liquid Crystals with Terminal Alkoxy Group Synthesis and Thermotropic Properties

Synthesis and Mesomorphic Properties of New Fluorinated Schiff Base Liquid Crystals

Mesogenic quinazolone derivatives: synthesis and characterisation

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