Low-melting dyes of tetra-alkyl AZOBENZENE (cas 103-33-3)-3,3′,5,5′-tetracarboxylates

Add time:08/14/2019    Source:sciencedirect.com

A series of tetraalkyl azobenzene-m-tetracarboxylates was synthesized and characterized by polarized-light optical microscopy (POM), differential scanning calorimetry (DSC) and by UV-visible spectroscopy investigations. The dyes were readily obtained from esterification reactions of azobenzene-m-tetracarboxylic acid and alcohols of different carbon chains (methyl, ethyl, propyl, i-propyl, butyl, s-butyl, i-butyl, pentyl, i-pentyl, hexyl, 2-ethylhexyl and octyl). All compounds showed good thermal stability with temperatures of decomposition above 300 °C. The increase and linearity of alkyl chains were important to give low-melting products. Branched alkyl substituents gave products with slightly higher melting points compared to their linear alkyl isomers. The octyl and racemic 2-ethylhexyl substituents gave liquid azo dye products. Photoisomerization of the azo group in the final compounds was investigated in solution. Compounds showed a good resistance to photoisomerization and the branched alkyl substituents gave products with considerable faster back relaxation, from cis to trans configuration, when compared to the compounds with linear alkyl substituents.

We also recommend Trading Suppliers and Manufacturers of AZOBENZENE (cas 103-33-3). Pls Click Website Link as below: cas 103-33-3 suppliers

Prev:Bioactivatable Reductive Cleavage of AZOBENZENE (cas 103-33-3) for Controlling Functional Dumbbell Oligodeoxynucleotides
Next:Visible light-, pH-, and cyclodextrin-responsive AZOBENZENE (cas 103-33-3) functionalized polymeric nanoparticles)