Synthesis and liquid crystalline properties of novel pyridine derivatives

Itahara, Toshio

doi:10.1002/jhet.5570450341

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…It is worth mentioning that 4-hydroxypyridine is a very appealing starting material as it can be either N-or O-alkylated in the first step [4][5][6], yielding either 4-pyridones or O-substituted pyridines respectively, followed by a second alkylation step to yield desired ILC materials. This represents a big advantage as different mesogenic groups can be introduced separately in the molecule with the aim of finely tune the liquid crystalline properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of counterion on the mesomorphic behavior and optical properties of columnar pyridinium ionic liquid crystals derived from 4-hydroxypyridine

Pană

Chiriac

Iliş

et al. 2015

Journal of Molecular Structure

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Section: Introductionmentioning

confidence: 99%

Effect of counterion on the mesomorphic behavior and optical properties of columnar pyridinium ionic liquid crystals derived from 4-hydroxypyridine

Pană

Chiriac

Iliş

et al. 2015

Journal of Molecular Structure

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“…Numerous previous reports indicated that the 4-hydroxypyridine precursors could be either N - or O -alkylated with various halide compounds giving either N -alkylated 4-pyridones or O -substituted pyridines, respectively [ 24 , 36 , 37 , 38 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

Thermal and Emission Properties of a Series of Lanthanides Complexes with N-Biphenyl-Alkylated-4-Pyridone Ligands: Crystal Structure of a Terbium Complex with N-Benzyl-4-Pyridone

et al. 2021

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This work focuses on the investigation of the liquid crystalline behavior and luminescence properties of the lanthanide complexes of Eu(III), Sm(III) and Tb(III) with N-biphenyl-alkylated-4-pyridone ligands. The organic ligands having a biphenyl group attached via a long flexible spacer with either 9 or 10 carbon atoms were synthesized by the reaction between 4-hydroxypyridine and the corresponding bromide compounds. The chemical structures of the organic and lanthanide complexes were assigned based on elemental analysis, single-crystal X-ray diffraction, 1H, 13C NMR and IR spectroscopies, and thermogravimetric analysis (TGA). The X-ray diffraction analysis of a parent compound shows that the lanthanide ions are surrounded by three monodentate pyridone ligands and three bidentate nitrate ions, giving a 9-coordinate environment. The mesogenic behavior and the type of liquid crystalline phases exhibited by the new complexes were analyzed by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM), and powder X-ray diffraction (XRD) studies. Only the lanthanide complexes with longer spacer (10) display a monotropic SmA phase, typically on a short thermal range (less than 10 °C). The complexes with shorter flexible chains (9) show no liquid crystalline properties with melting temperatures lower than their analogs with longer spacers. The emission spectra recorded in solid state at room temperatures show typical emission bands for each lanthanide ion employed (Eu(III), Tb(III) and Sm(III)).

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Effect of disubstitution pattern of the terminal alkyl chains on the mesophase of liquid crystals based on lanthanide(III) complexes: A study of the thermal, emission and dielectric behavior

Ilincă

Chiriac

Iliş

et al. 2022

Journal of Molecular Liquids

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Synthesis and liquid crystalline properties of novel pyridine derivatives

Abstract: The treatment of 4‐hydroxypyridine with cholestery p‐(ω‐bromoalkyloxy)benzoates in N,N‐dimethylformamide containing K2CO3 gave cholestery p‐[ω‐(4‐pyridyloxy)alkyloxy]benzoates, which exhibited liquid crystalline properties

Cited by 9 publications

References 18 publications

Effect of counterion on the mesomorphic behavior and optical properties of columnar pyridinium ionic liquid crystals derived from 4-hydroxypyridine

Effect of counterion on the mesomorphic behavior and optical properties of columnar pyridinium ionic liquid crystals derived from 4-hydroxypyridine

Thermal and Emission Properties of a Series of Lanthanides Complexes with N-Biphenyl-Alkylated-4-Pyridone Ligands: Crystal Structure of a Terbium Complex with N-Benzyl-4-Pyridone

Effect of disubstitution pattern of the terminal alkyl chains on the mesophase of liquid crystals based on lanthanide(III) complexes: A study of the thermal, emission and dielectric behavior

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