SYNTHESIS AND SPECTROSCOPIC CHARACTERIZATION OF SOME TETRADENATE SCHIFF BASES AND THEIR NICKEL, COPPER AND ZINC COMPLEXES

摘要

Three ligands have been formed by the 1:2 molar condensation of o-phenylenediamine with salicylaldehyde, 2-hydroxy-1-naphthaldehyde or o-hydroxyacetophenone. The potentially tetradentate ligands are N,N-bis-(salicylaldehyde)-o-phenylenediamine (SalophH_2), N,N-bis(2-hydroxy-1-naphthalde-hyde)-o-phenylenediamine (NophH_2) and N,N-bis(o-hydroxyacetophenone)-o-phenylenediamine (AophH_2), respectively. These ligands form 1:1 complexes with nickel, copper and zinc ions. The complexes have been characterized by IR, ~1H NMR, MS, UV/Vis spectra in addition to elemental analyses. The spectral data of the ligands and their complexes are discussed in connection with the structural changes which occur due to complexation.