Molecular Crystals and Liquid Crystals, Vol.403, 33-47, 2003
Synthesis, characterization, and study of mesogenic properties of Cu(II) and Ni(II) complexes of bis- and tetradentate Schiff's bases derived from 2-hydroxy 4-(n-alkoxy) benzaldehydes
Bis-(2-hydroxy-4-(n-alhoxy) benzaldimino) copper (II) and bis-(2-hydroxy-4 (n-alkoxy) benzalditnino) nickel (II) complexes have been synthesized by the reaction of 2-hydroxy-4-(n-alkoxy) benzaldehyde with tetraamine complexes of Cu(II) and Ni(II) under template condition. Cu(II) and Ni(II) complexes of 1,2-bis-(2-hydroxy-4-(n-alkoxy) benzaldinzino) ethane and 1,3-bis-(2-hydroxy-4-(n-alkoxy) benzaldimino) propane have been synthesized from the imine complexes by amine exchange with 1,2-diaminoethane and 1,3-diaminopropane, respectively. The complexes have been characterized by spectral and magnetic studies. Some of these complexes exhibit mesogenic properties. This has been correlated to the structures of the complexes.
Keywords:square planar geometry;liquid crystal;metallomesogen;template synthesis;amine exchange reaction