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The one-step metal promoted reaction between 5-(4-alkoxyphenylazo) salicylaldehyde (alkoxy = decyloxy, dodecyloxy, tetradecyloxy) and 2-propanolamine in the presence of Cu (CH3COO)·4H2O yields new azo-containing salicylaldimine based copper(II) bis(chelates) as a result of the [1 + 1] Schiff base condensation. The mesogenic properties of these complexes were studied by differential scanning calorimetry (DSC) and polarizing microscope equipped with a heating and cooling stage. Copper complexes containing dodecyloxy and tetradecyloxy chain gave liquid crystalline character, while decyloxy containing copper complex was non-mesomorphic.
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Rezvani et al. (2008) studied this question.
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