Imine based chiral liquid crystals: Effect of varying the terminal substituent and orientation of ester linking unit

Karanlık, Gürkan; Ocak, Hale; Eran, Belkız Bilgin

doi:10.1016/j.molliq.2018.11.102

Cited by 14 publications

(2 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previously, the works mainly concentrated on the Schiff bases having alkyl/alkyloxy chains. Current works has been shifting towards Schiff bases possessing alkanoyloxy chains owing to their interesting properties and substantial temperature range [9][10][11][12][13][14][15][16][17][18][19][20]. Besides application as liquid crystals, Schiff bases are also studied for their biological activities [21,22] and also used as ligand for the coordination compounds [23].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Mesogenic Properties of New Aromatic Schiff Base’s Esters

Lee,

Chelsea,

et al. 2023

AChJ

View full text Add to dashboard Cite

A homologous series of new Schiff base’s esters, 4-bromobenzylidene-4’-alkanoyloxyanilines were syn-thesized. The structure of the synthesized compounds was elucidated using IR and NMR spectroscopic techniques along with mass spectrometric method. Nine homologous members were prepared whereby the length of alkanoyloxy chain, Cn-1H2n-1COO is varied from n = 2, 4, 6, 8, 10, 12, 14, 16 and 18. Their thermotropic properties were analyzed using differential scanning calorimetry and polarized optical mi-croscopy techniques. Whilst short chain members (number of carbons, n = 2, 4) are non-mesogens, member with n = 6 exhibited monotropic smectic A (SmA) phase. As the n increased to 8, this com-pound becomes the only member that exhibited SmA and SmB as enantiotropic phase. Varying from n = 10 to n = 16, these members displayed enantiotropic SmA and monotropic SmB phases. Longest chain member, n-octadecanoyloxy derivatives exhibited only single mesophase (monotropic SmA). The ester linkage and polar terminal (bromo) group in the present series are essential for the smectic polymorphism in Schiff bases

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis and Mesogenic Properties of New Aromatic Schiff Base’s Esters

Lee,

Chelsea,

et al. 2023

AChJ

View full text Add to dashboard Cite

show abstract

“…The liquid crystal term signifies a state of matter that has the properties of the crystalline solid and the amorphous liquid which means a liquid crystal shows the mobility of a liquid, as well as the order of a crystalline structure . Liquid crystal molecules, possess anisotropic electric and magnetic susceptibilities, and the orientation of liquid crystals can be changed by external factors, such as magnetic and electric fields .…”

Section: Introductionmentioning

confidence: 99%

A Novel Imine Based‐Liquid Crystal / PHBHHx Composite: Synthesis and Characterization

et al. 2020

Self Cite

View full text Add to dashboard Cite

A new imine based chiral calamitic compound carrying a (S)-3,7-Dimethyloctyloxy group at one of terminal was synthesized and characterized by 1 H-NMR, 13 C-NMR and FT-IR spectroscopy. 4-Dodecyloxybenzylidene-4'-(S)-(3,7-dimethyloctyloxy) aniline (DBDMA) exhibits an enantiotropic chiral smectic tilted phase (SmC*) at a low temperature range. The mesomorphic properties of new liquid crystal were determined by Differential Scanning Calorimetry (DSC) and Polarised Optical Microscopy (POM). A new composite membrane was also prepared from DBDMA and Poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) via solvent evaporation technique. The surface morphology as well as the mechanical behaviour of PHBHHx/ DBDMA composite membrane were investigated by Scanning Electron Microscopy (SEM) and Dynamic Mechanical Analysis (DMA). Additionally, cell compatibility tests of the PHBHHx/ DBDMA composite were performed by 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) method. The surface of PHBHHx/DBDMA composite membrane exhibited a homogenous porosity. The introduction of DBDMA into the polymer media improves the cell viability and mechanical strength.

show abstract