Mesomorphic properties of benzoxazole Salicylaldimines and their Copper(II) Complexes: Synthesis and structural characterization

A series of benzoxazole based 5-(alkoxy)-2-(((4-(5-methylbenzoxazol-2-yl-)- phenyl)imino)methyl)phenol, HLn (n = 10, 12, 14) and their copper(II) complexes had been synthesized; molecular structures of all the organic compounds and the metal complexes were elucidated by various spectroscopic techniques along with elemental analyses. Thermotropic properties were investigated by a combination of POM observation, DSC analysis and X-ray diffraction experiments. All members of the series exhibit enantiotropic smectic-A (SmA) mesophase. DFT calculations imply stable electronic structure of the ligand; HLn (n = 12) as well as of its copper(II) complex.