James M. McCrae

Mononuclear Ni(II) and Zn(II) complexes of some potentially binucleating Schiff base ligands

Abstract Mononuclear Zn(II) and Ni(II) complexes have been prepared from two new Schiff base ligands in which two alternative co-ordination sites (N 2 O 2 or O 2 O 2 ) occur. The first ligands is the Schiff base derived from 1,2-diaminobenzene and 2-hydroxy-3-carboxyl-1-napthaldehyde (bopaH 4 ). The complexes of this ligand contain the metal ions in the N 2 O 2 coordination site as a result of the steric requirements of the co-ordinated ligand. The second ligand series are derivatives of X-substituted 1,2-diaminobenzenes, 2-hydroxy-3-carboxy-1-naphthaldehyde and 2-hydroxy-5-methyl isophthaldehyde (X-bolaH 3 ). In this case Ni(II) occupies the N 2 O 2 site in its complexes with the X-bolaH 3 ligands, whereas the Zn(II) complexes are co-ordinate through the O 2 O 2 site since the steric restrictions are less severe.