138529-35-8

Upstream product

• 94-09-7 p-aminoethylbenzoate 
• 4418-89-7 ethyl 4-[(E)-2-(4-hydroxyphenyl)diazen-1-yl]benzoate 
• 629-04-9 1-Bromoheptane 
• 105299-45-4 4-(4-hydroxphenylazo)benzoic acid 
• 108-95-2 phenol 
• 4418-89-7 ethyl 4-[(4-hydroxyphenyl)diazenyl]benzoate 
• 139056-50-1 ethyl 4-((4-heptyloxyphenyl)diazenyl)benzoate 
• 150-13-0 4-amino-benzoic acid 

Downstream Products

• 138529-37-0 4-{[4-(heptyloxy)phenyl]azo}benzoyl chloride 
• 1306600-13-4 C₂₉H₂₈N₂O₅ 

Relevant academic research and scientific papers

Monotropic or enantiotropic mesophases? Liquid-crystalline and solid state polymorphism 4-Chloro-1,3-phenylene bis-[4-(4-alkyloxyphenylazo)benzoates

This article presents a homologous series of bent-core molecules consisting of a 4-chlororesorcinol as a central unit and 4-[(4-alkyloxyphenyl)diazenyl] benzoic acids as wings. With the use of polarizing optical microscopy (POM), thermal analysis (TOA) and differential scanning calorimetry (DSC) the mesogenic properties were detected. Furthermore, the X-ray diffraction (XRD) measurements were also performed for selected samples. Compounds of the above mentioned series form nematic, B6, and smectic C mesophases. An interesting phenomenon in the solid phase polymorphism was observed in some cases. In our experiment one crystalline form (CrI) melts to nematic phase while the second form (CrII) melts at higher temperature directly to isotropic phase. The solid state modification determines whether a monotropic and an enantiotropic mesophase is observed.

Hockey stick liquid crystals based on a 2,5-asymmetric disubstituted [1,3,4]oxadiazole core

The article describes the liquid-crystalline properties of some 2,5-asymmetric disubstituted [1,3,4]oxadiazole derivatives containing an azo and an ester linkage obtained through esterification of 2-(4-methoxyphenyl)-5-(4- hydroxyphenyl)-[1,3,4]oxadiazole with a series of 4-(4-alkoxyphenyl)-benzoic acids containing 6-10 and 18 aliphatic carbon atoms. All reported compounds present liquid-crystalline properties, evidenced by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM), with nematic and smectic C type structures, with very large range of stability of mesophases (between 130°C and 198°C on heating and 134°C and 214°C on cooling). Copyright Taylor & Francis Group, LLC.

Synthesis and physico-chemical properties for 2-oxochromen-6-yl 4-(4-alkoxyphenylazo)benzoates

This paper describes the preparation and thermal properties for homologous series of 2-oxochromen-6-yl 4-(4-alkoxyphenylazo)benzoates (compounds 1-n). Compounds 1-n show nematic phase exclusively, where the nematic-isotropic phase transition temperatures are between 293° C for 1-4 and 256° C for 1-8. Interestingly, compound 1-8 exhibits smectic A and re-entrant nematic phases in addition to the nematic one. The smectic A phase are characterized using a small angle X-ray diffraction study, indicating the smectic A phase has a partially bilayer molecular arrangement. Copyright Taylor & Francis Group, LLC.