Mesogenic Schiff's base ether with dimethylamino end group

Ha, Sie‐Tiong; Ong, Lay Khoon; Wong, Joanna Pik Wan; Yeap, Guan‐Yeow; Lin, Hong‐Cheu; Ong, Siew Teng; Koh, Teck Ming

doi:10.1080/01411590902957449

Cited by 34 publications

(22 citation statements)

References 24 publications

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“…Past three decades, attention in the chemistry of first row transition metal Schiff base chelates is very high because of their essential it in the field of catalysis like hydroformylation, carbonylation, oxidation, reduction, hydrolysis and epoxidation [1][2][3][4][5][6][7]. Schiff base complexes are also noted for their significant antifungal and antibacterial activities.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, Antimicrobial and Anticancer Activities of 14-Membered Macrocyclic Schiff Base Metal Complexes

Palanimurugan¹,

Kulandaisamy²

2018

Asian J. Chem.

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New cationic 14-membered macrocyclic Schiff base metal complexes have been synthesized by condensation of benzalidene-curcuminyl-4-iminoantipyrine and 2,6-diaminopyridine. Structural characterization of the compounds was done using elemental analysis, molar conductivity, magnetic susceptibility, Mass, SEM, XRD, 1 H NMR, UV-visible, IR and EPR spectra. X-ray diffraction patterns suggested that the size of Schiff base is reduced due to chelation by the metal ion. Different morphologies of synthesized compounds were identified by SEM images. Magnetic moment values, UV-visible and IR spectral studies confirms the square planar geometry of chelates. However [VOL]Cl2 exists in octahedral geometry. Electron spin resonance spectra parameters of [CuL]Cl2 and [VOL]Cl2 complexes were well coinciding with proposed geometries. The in vitro biocidal activities of the compounds were done against some bacterial and fungal strains by disc diffusion method. Anticancer activity of Schiff base and copper complex were carried out by MTT method which reveals that the inhibition against the growth of breast cancer cell line culture for chelate is higher than Schiff base.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, Antimicrobial and Anticancer Activities of 14-Membered Macrocyclic Schiff Base Metal Complexes

Palanimurugan¹,

Kulandaisamy²

2018

Asian J. Chem.

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“…[1,2] From these structural investigations, one can mention the ester orientation within the rigid core, the position of azo/ester groups, lateral substitutions, as well as the terminal chain length. [3][4][5][6][7][8][9][10][11][12] In a liquid crystal compound, lateral substitution makes molecules broad, thus playing an effective role in the mesogenic properties of the resulting derivatives. Lateral substituent in rigid core can destroy the molecular closed packing, reduce liquid crystal melting point, thereby improving the solubility of liquid crystal effectively.…”

Section: Introductionmentioning

confidence: 99%

Mesophase behaviour of laterally di-fluoro-substituted four-ring compounds

Ahmed

Saad

2015

Liquid Crystals

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Four new groups of the di-fluoro-substituted 4-(2′-(or 3′)-fluoro phenylazo)-2-(or 3-) fluoro phenyl-4″-alkoxyphenylazo benzoates (In-IVn) were prepared and investigated for their mesophase behaviour. An alkoxy group of variable chain length (n = 6, 10 and 14 carbons) is attached to the terminal phenylazo benzoate moiety, and two lateral fluoro substituents are attached individually with different orientations to the other two adjacent rings. The molecular structures of the prepared compounds were confirmed by Fourier transform infrared spectroscopy and 1 H NMR spectroscopy. The study aims to investigate the steric effect of the spatial orientation and relative positions of the two lateral fluorine atoms on the mesomorphic properties in their pure states. The mesophase behaviour was investigated via differential scanning calorimetry and mesophases were identified by polarised light microscopy. The investigation shows that these compounds exhibit high enantiotropic mesophases (SmC and N) and broad mesophase temperature range. The type and stability of the mesophase depends on the length of the terminal alkoxy chain and the position the two fluoro substituents. A comparison between these investigated compounds with their corresponding three-ring analogues was discussed.

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“…The presence of a long alkyl chain at the para position of the aldehyde or aniline fragment of N-benzylideneanilines has been regarded as one of the important elements which favours the existence of liquid crystal phases [5][6][7]. Different terminal chain length can significantly influence the anisotropic properties of liquid crystals [5].…”

Section: Introductionmentioning

confidence: 99%

3-Hydroxy-4-{[(4-bromophenyl)imino]methyl}phenyl Octadecanoate

Koh

et al. 2010

Molbank

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Abstract:A new Schiff base ester, 3-hydroxy-4-{ [(4-bromophenyl) Schiff bases have attracted overwhelming attentions from many researchers owing to their importance in exhibiting thermochromism and photochromism [1][2][3][4]. The presence of a long alkyl chain at the para position of the aldehyde or aniline fragment of N-benzylideneanilines has been regarded as one of the important elements which favours the existence of liquid crystal phases [5][6][7]. Different terminal chain length can significantly influence the anisotropic properties of liquid crystals [5]. Thus, we report here another new derivative containing an octadecanoyloxy chain, 3-hydroxy-4-{[(4-bromophenyl)imino]methyl}phenyl octadecanoate. OPEN ACCESS

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Mesogenic Schiff's base ether with dimethylamino end group

Cited by 34 publications

References 24 publications

Synthesis, Characterization, Antimicrobial and Anticancer Activities of 14-Membered Macrocyclic Schiff Base Metal Complexes

Synthesis, Characterization, Antimicrobial and Anticancer Activities of 14-Membered Macrocyclic Schiff Base Metal Complexes

Mesophase behaviour of laterally di-fluoro-substituted four-ring compounds

3-Hydroxy-4-{[(4-bromophenyl)imino]methyl}phenyl Octadecanoate

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