Abstract
The synthesis, characterization, and mesomorphic properties of a new series of Schiff bases 2a– h and metal complexes 1a– h– M are prepared and their mesomorphic properties studied. Two single crystallographic structures of 2d ( n=12, m=1) and 1g– Pd ( n= m=12) were determined by X-ray analysis. Both compounds crystallize in a triclinic space group P−1. A dimeric structure formed by intermolecular H-bonds in 2d was observed, giving nematic phase due to a better aspect ratio. The central geometry at Pd 2+ ion is nearly perfect square plane. All Schiff bases 2a– h formed N or/and SmC phases. The formation of mesophases of complexes 1a– h– M was strongly dependent on metal ions incorporated. All Cu 2+, Ni 2+ and Pd 2+ complexes exhibited N or/and SmC phase, respectively. However, Zn 2+ and Co 2+ complexes were not mesogenic. The lack of mesomorphism was probably attributed to a preferred tetrahedral geometry at Zn 2+ and Co 2+ over a square-planar geometry at Cu 2+ and Pd 2+.
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