1373207-60-3

Upstream product

• 79-41-4 poly(methacrylic acid) 
• 108-95-2 phenol 
• 106-40-1 4-bromo-aniline 
• 143-15-7 1-dodecylbromide 
• 40530-18-5 5-bromo-2-hydroxybenzonitrile 
• 3035-94-7 (E)-4-((4-bromophenyl)diazenyl)phenol 
• 1373207-50-1 5-bromo-2-(dodecyloxy)benzonitrile 
• 1373207-56-7 (E)-4'-((4-(6-bromohexyloxy)phenyl)diazenyl)-4-(dodecyloxy)biphenyl-3-carbonitrile 
• 920-46-7 Methacryloyl chloride 
• 1373207-48-7 (E)-1-(4-(6-bromohexyloxy)phenyl)-2-(4-bromophenyl)diazene 
• 1373207-53-4 3-cyano-4-(dodecyloxy)phenylboronic acid 

Downstream Products

• 1429894-53-0 C₄₁H₅₃N₃O₄ 

Relevant academic research and scientific papers

Liquid-crystalline polymers bearing phenylene(azobenzene) moieties substituted with an electron-donor or electron-acceptor lateral group. Synthesis, mesomorphic behavior and photo-induced isomerization

Methacrylic polymers bearing phenylene(azobenzene) moieties substituted with a OCH3 (electron-donor) or a CN (electron-acceptor) lateral group were synthesized and their liquid-crystalline (LC) and photo-induced isomerization properties were studied. The thermotropic LC properties were analyzed by DSC, POM, and XRD. All polymers showed a mesomorphic behavior that extends over wide temperature ranges (>100 °C) displaying smectic type mesophases. The effect of the lateral group was reflected in the packing of mesogens in the smectic phases; the polar interactions of the CN groups seem to counterbalance the hindering effects of this lateral group. On the other hand, the photoisomerization of all polymers was induced in dilute solution and films (spin coated and casted). All polymers photoisomerize relatively fast with the CN-substituted polymers reaching high cis-isomer contents (>95%) at the photostationary state. Light induced birefringence experiments indicated a tight interplay between the photo-induced orientation and the LC intrinsic order. Homogeneous sinusoidal surface relief gratings were obtained.

Azo monomers exhibiting low layer shrinkage at the SmA-SmC transition and trans-cis light-induced isomerization

Methacrylic monomers containing a (phenylene)azobenzene unit substituted with a lateral cyano group and alkyl chains of different length are synthesized and characterized by NMR techniques. Their liquid-crystalline properties are studied by differential scanning calorimetry, polarizing optical microscopy, and X-ray diffraction. All monomers exhibit a mesomorphic behavior that extends over wide temperature ranges with nematic and orthogonal or tilted smectic-type mesophases, depending on the length of the terminal chain. The smectic structures are determined to be single-layered with a low layer shrinkage (a high smectic order promoted by both π-π and bond dipole-bond dipole interactions between cyano-substituted central cores, and a low correlation between neighboring layers arising from dispersive forces between the end groups (methacrylic group and alkyl chain) of the monomer. On the other hand, the trans-cis isomerization of monomers is induced in solution by irradiating with a UV lamp. High cis-isomer contents (≥96 %) are obtained at the photostationary state, which is reached in a relatively short time (40 s). Copyright