Schiff-base Complexes of Cobalt(II), Nickel (II) and Copper(II) Metal Ions: Synthesis, Characterization and Their Heterobimetallic Adducts with TiCL4

Abstract

Schiff-base ligands (L), prepared from salicylaldehyde and ammonia
or 1,2-dimethylbutylamine or cycloheptyl amine have been
used into in situ reaction with the metal ions, Co(II), Ni(II) and
Cu(II), in 2 : 1 molar ratio (ligand: metal ion) in ethanol or chloroform
to yield metal complexes of the general formula ML₂. The
mononuclear complexes were found to behave as Lewis bases in
their reactions with the strong Lewis acid TiCl₄ to give discrete
heterobinuclear base adducts of the type ML₂·TiCI₄ or polymeric
species of the type [ML₂·TiCI₄]_n, n > 2. The complexes yielded have
been characterized by their physical and spectroscopic means, and
tentative structures have been suggested accordingly.