Synthesis, liquid crystal characterization and photo-switching studies on fluorine substituted azobenzene based esters

Abstract

Structure property relations by tuning mono and difluoro substitution showing the photoisomerization effect.

Carboxylation of Aromatic and Aliphatic Bromides and Triflates with CO2 by Dual Visible‐Light–Nickel Catalysis

“…In particular,the product 3,5-difluorobenzoic acid has been regarded as an important precursor for the synthesis of liquid-crystalline materials. [14] This carboxylation method was also compatible with naphthalene and heteroaromatic rings,i ncluding benzothiophene,b enzothiazole,a nd quinoline (products 2y, 2z, 2aa,a nd 2ab). Only hydrogenation adducts were detected as by-products,and no dimerization adducts were observed (see Table S3).…”

Photoresponsive behavior of hydrophilic/hydrophobic-based novel azobenzene mesogens: synthesis, characterization and their application in optical storage devices

“…Compounds 22-30 were obtained upon treatment with ethyl iodide. The crude product was recrystalized from a mixture of ethanol/n-hexane and characterized using 1 H-NMR, 13 C-NMR, HRMS and elemental analyses.…”

“…60-90 C), acetonitrile (99.9%), dichloromethane (99.9%), acetone (99%) and ethyl acetate (99%) were commercial products obtained from Acros Organics. 1 H NMR (400 MHz) and 13 C NMR (100 MHz) were recorded on a Bruker 400 MHz Ultrashield™ spectrometer. Elemental analysis was performed using a CHN elemental analyser.…”

“…This reverse transformation can also occur in the "dark" via a process known as thermal back relaxation. 12,13 The decoration of different functional groups on the azobenzene chromophore has been studied to enhance its optical storage properties. [14][15][16][17][18][19][20][21] Ionic liquids have been developed in the past two decades because of their unique physicochemical properties and highly tunable features with chemical modication.…”

Carboxylation of Aromatic and Aliphatic Bromides and Triflates with CO2 by Dual Visible‐Light–Nickel Catalysis

“…Ab road range of para-( see products 2b-l)a nd meta-substituted arenes (see products 2m-r)r eacted with CO 2 smoothly to afford carboxylic acids in moderate to excellent yields (47-93 %). [14] This carboxylation method was also compatible with naphthalene and heteroaromatic rings,i ncluding benzothiophene,b enzothiazole,a nd quinoline (products 2y, 2z, 2aa,a nd 2ab). Intriguingly,a northo-substituted aryl bromide with an ester group could be used as asubstrate to give the desired product 2s with good efficiency, which was difficult with previously reported systems.…”