Liquid crystalline properties and phase situations in 4-chlorobenzylidene-4′-alkylanilines

Galewski, Zbigniew; Coles, H. J.

doi:10.1016/s0167-7322(98)00104-4

Cited by 49 publications

(23 citation statements)

References 2 publications

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“…The singlet observed at the most downfield region, δ = 8.66 ppm, supported the presence of the imine linking group [11]. The molecular structure of 4d was further verified by using 13 CNMR spectroscopy ( Fig. (4)).…”

Section: Results and Discussion Synthesis And Spectral Studiesmentioning

confidence: 69%

“…FT-IR data were acquired with a 8300 Shimadzu Fourier Transform Infrared spectrophotometer in the frequency range of 4000 to 400 cm -1 with samples embedded in KBr pellets. 1 HNMR and 13 CNMR spectra were recorded in DMSO using a Bruker 300 MHz NMR Nasreen R. Jber…”

Section: Instrumentalmentioning

confidence: 99%

“…Typical terminal moieties exhibiting liquid crystal properties are those alkoxy group. Polar substituents possessing strong dipole moments, thus having the ability to promote mesomorphic properties [13]. The increased dipole moment enhances the stability of the lattice and melting temperatures [14].…”

Section: Introductionmentioning

confidence: 99%

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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: Results and Discussion Synthesis And Spectral Studiesmentioning

confidence: 69%

Section: Instrumentalmentioning

confidence: 99%

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

Jber

Shukur

Najaf

2017

JNUS

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“…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]. However, the present compound with fluoro substituent exhibited single mesophase.…”

Section: Introductionmentioning

confidence: 67%

“…Typical terminal substituents exhibiting LC properties are those with electronegative atoms, such as halogens. Halogens are polar substituents possessing strong dipole moments, thus having the ability to promote mesomorphic properties [19][20][21]. The increased dipole moment enhances the stability of the lattice and melting temperatures [7].…”

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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Synthesis, Characterisation and Mesophase Transition of Hexasubstituted Cyclotriphosphazene Molecules with Schiff Base and Azo Linking Units and Determination of Their Fire Retardant Properties

et al. 2021

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Liquid crystalline properties and phase situations in 4-chlorobenzylidene-4′-alkylanilines

Cited by 49 publications

References 2 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

Synthesis, Characterisation and Mesophase Transition of Hexasubstituted Cyclotriphosphazene Molecules with Schiff Base and Azo Linking Units and Determination of Their Fire Retardant Properties

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