Self-assembled liquid crystalline materials with fatty acids

Bhat, Sangeetha G.; Ramachandra, Girish Sharada; Bhagavath, Poornima; Subrao, Mahabaleshwara; Potukuchi, D. M.; Srinivasulu, M.

doi:10.1007/s10973-017-6879-y

Cited by 14 publications

(6 citation statements)

References 34 publications

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“…Bhat et al 61 prepared two series of hydrogen bonded liquid crystalline materials by mixing non-mesomorphic fatty acids such as nonanoic (145a), capric (145b), undecanoic (145c), tridecanoic (145d), myristic (145e), palmitic (145f) and stearic (145g) acids with (4-pyridyl)-benzylidene-p-n-alkylanilines (144a-b; n ¼ 12 or 16). Condensation of 4-pyridine carboxaldehyde and the corresponding anilines, such as 4-n-dodecylaniline (143a) and 4-n-hexadecylaniline (143b), in the presence of a catalytic amount of glacial acetic acid yielded (4-pyridyl)- benzylidene-4 0 -n-alkylanilines 144a-b.…”

Section: Pyridine-based Molecules As Thermotropic Mesogensmentioning

confidence: 99%

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Recent synthetic advances in pyridine-based thermotropic mesogens

Devadiga

Ahipa

2019

RSC Adv.

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Section: Pyridine-based Molecules As Thermotropic Mesogensmentioning

confidence: 99%

“…Textures of (a) smectic A, (b) smectic B, (c) smectic C, and (d) smectic X phases observed by POM 61,124,125. …”

mentioning

confidence: 99%

Recent synthetic advances in pyridine-based thermotropic mesogens

Devadiga

Ahipa

2019

RSC Adv.

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“…Nowadays, liquid crystalline (LC) compounds prove to have several applications as optical materials-areas of technological applications such as displays, light-emitting diodes based on organic derivatives, anisotropic networks, and semi-and photoconductors materials [1][2][3]. The most helpful characteristics of these LC compounds that are considered to be essential in applications in devices are the mesophase type, switching times and optical rotation-power near the working temperatures [4]. Geometrical-property relationships could be important tools to synthesize suitable architectures to achieve the desired properties for device-displays [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Optical Characterizations and Solar Energy Applications of New Schiff Base Materials

et al. 2021

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A new set of laterally OCH3-substituted photoactive liquid crystalline analogues, 4-hexyloxy phenyl- imino-4ʹ-(3-methoxyphenyl)-4ʹ’-alkoxybenzoates, were synthesized and investigated for their mesomorphic behavior. The prepared set constitutes five analogues that differ from each other by the terminally attached compact polar group. Characterization of the synthesized derivatives is conducted using differential scanning calorimetry (DSC), polarized optical microscopy (POM), and UV-spectroscopy. Molecular structures were elucidated by elemental analyses, FT-IR and NMR spectroscopy. DSC and POM investigations indicated that all the prepared derivatives are monomorphic possessing the nematic (N) phase, except for the unsubstituted derivative that is nonmesomorphic. On the other side, the photophysical study and the optical spectra measurements confirm the photoactivity of the present compounds under UV/visible irradiation. The measured optical spectra showed impressive enhancement in the optical absorption and reduction in the optical bandgap from 3.63 to 3.0 eV depending on the terminal group. From the study of the DC electric properties, the lowest resistance, 106.5 GΩ at scan rate 0.1 V/s, was observed for the I6d film with Cl terminal, which decreased to 49.5 GΩ by increasing the scan rate to 0.5 V/s. Moreover, the electrical conductance is decreased from 9.39 pS to 1.35 pS at scan rate 0.1 V/s by changing the terminal group from Cl to F. The enhanced optical absorption and the reduced energy gap make the optimized samples suitable material for solar energy applications.

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“…Optical displays and temperature/humidity sensors are important applications of liquid crystal (LC) in the field of instrumentation [1,2,3,4,5]. The most effective features of these materials that must be considered to be accessible in devices’ applications are the type of the phase, tilt angle, dielectric anisotropy, birefringence anisotropy, switching times, and optical rotation power at convenient working temperatures [6]. Structure-activity relationships could be helpful tools to design a material to achieve the desired properties for device applications [7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Optical, and Geometrical Approaches of New Natural Fatty Acids’ Esters/Schiff Base Liquid Crystals

et al. 2019

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Schiff base liquid crystals, known as [4-(hexyloxy)phenylimino)methyl]phenyl palmitate (IA), [4-(hexyloxy)phenylimino)methyl]phenyl oleate (IIA) and [4-(hexyloxy)phenylimino)methyl]phenyl linoleate (IIIA), were synthesized from palmitic, oleic, and linoleic natural fatty acids. The prepared compounds have been investigated for their thermal and optical behavior as well as phase formation using differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Molecular structures of all studied compounds were confirmed via elemental analysis, FT-IR, 1H NMR, and 13C NMR. Smectic phase is the observed mesophase for all compounds; however, their type and range depend upon the terminal alkanoate chains attached to the phenyl ring. Computational calculations, Density functional theory (DFT), energy difference of the frontier molecular orbital (FMOs), as well as the thermodynamic parameters of different molecular configurations isomers were discussed. It was found that the mesophase behavior and the geometrical characteristics were affected by the degree of unsaturation of fatty terminal chains. Furthermore, the geometrical structure of the CH=N linkage plays an important role in the thermal stability and optical transition temperature.

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Self-assembled liquid crystalline materials with fatty acids

Cited by 14 publications

References 34 publications

Recent synthetic advances in pyridine-based thermotropic mesogens

Recent synthetic advances in pyridine-based thermotropic mesogens

Synthesis, Optical Characterizations and Solar Energy Applications of New Schiff Base Materials

Synthesis, Optical, and Geometrical Approaches of New Natural Fatty Acids’ Esters/Schiff Base Liquid Crystals

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