Liquid crystalline properties of copper(II) complexes derived from azo-containing salicylaldimine ligands

The one-step metal promoted reaction between 5-((4-alkoxyphenyl)azo) salicylaldehyde (alkoxy = decyloxy, dodecyloxy, tetradecyloxy) and ethanolamine in the presence of Cu(CH3COO) · 4H2O yields new salicylaldimine based copper(II) bis(chelates) as a result of the [1 + 1] Schiff base condensation. The liquid crystalline character of these complexes was examined using differential scanning calorimetry (DSC) and a polarizing microscope equipped with a heating and cooling stage. All copper complexes form the enantiotropic Smectic C mesophase.

Bis[5-((4-nalkoxyphenyl)azo)-N-ethanol salicylaldiminato]copper(II) complex homologues have been synthesized. The liquid crystalline character of these complexes has been examined by using differential scanning calorimetry (DSC) and a polarizing microscope equipped with a heating and cooling stage. All complexes form the enantioptropic Smectic C mesophase.Figure optionsDownload as PowerPoint slide