Synthesis and characterization of novel M(II) (M = Mn(II), Ni(II), Cu(II) or Zn(II)) complexes with tridentate N2,O-donor ligand (E)-2-amino-N’-[1-(pyridin-2-yl)- ethylidene]benzohydrazide

Abstract

The coordination chemistry towards the M(II) metal centre (M = Mn, Ni, Cu or Zn) of the hydrazone ligand (E)-2-amino-N’-[1-(pyridin-2-yl)ethylidene]benzohydrazide (H₃L) has been explored and complexes having formulae [Mn(H₂L)₂] (1), {[Ni(H₂L)₂].DMF.0.4H₂O} (2), {[Cu₂(H₂L)₂(µ-Cl)₂].DMF} (3) and [Zn(H₂L)₂] (4) have been isolated and characterized by IR, UV-Visible spectroscopy, elemental analysis and X-ray crystal diffraction. Structural studies reveal that the mononuclear complexes (1), (2) and (4) adopt highly distorted octahedral geometries while the dinuclear complex (3) adopts a square pyramidal geometry around each copper(II) ion.

KEY WORDS: Schiff base, Phenolate, Manganese(II), Nickel(II), Copper(II), Zinc(II), Mononuclear complexes, X-Ray structure

Bull. Chem. Soc. Ethiop. 2016, 30(1), 101-110.

DOI: http://dx.doi.org/10.4314/bcse.v30i1.9