Low temperature enantiotropic nematic phases from V-shaped, shape-persistent molecules

Low temperature enantiotropic nematic phases from V-shaped, shape-persistent molecules

A series of V-shaped, shape-persistent thiadiazole nematogens, based on an oligo(phenylene ethynylene) scaffold with ester groups connected via alkyloxy spacers, was efficiently prepared by a two-step procedure. Phase engineering results in an optimum of the mesophase range and low melting temperature when the nematogens are desymmetrised with a butoxy and a heptyloxy spacer. The mesophases are...

Shape-Persistent V-Shaped Mesogens-Formation of Nematic Phases with Biaxial Order

Synthesis and properties of oxadiazole based V-shaped, shape persistent nematogens.

A series of biaxial V-shaped, shape-persistent molecules has been synthesised by stepwise coupling of phenylene ethynylene arms to an oxadiazole bending unit. Studies of their thermotropic nematic phases point to phase biaxiality.

Wide blue phase range of chiral nematic liquid crystal doped with bent-shaped molecules

A wide blue phase range of 29 C is induced by a bent-shaped molecule that is doped in chiral nematic liquid crystals. The physical mechanisms of this effect are investigated through experimental comparisons and molecular simulations. The results obtained indicate that the wide temperature range is closely related to the lower interfacial tension between liquid crystals and defects, and the shri...

Efficient second harmonic generation from thin films of V-shaped benzo[b]thiophene based molecules.

We have designed an original approach for efficient Second Harmonic Generation of tailored V-shape benzo[b]thiophene molecular systems enabling versatile and flexible one-step, dry and technologically friendly thin film processing. The designed moieties show chi((2)) values at least as high as the reference LiNbO(3) single crystal, without poling processing and matching the constrains of integr...