Studies on some metal (II) sulphates salts chelates of salicylaldehyde benzoyl acid hydrazone and acetylaldehyde benzoyl acid hydrazone

Salicylaldehyde benzoyl acid hydrazone and Acetylaldehyde benzoyl acid hydrazone and their
complexes with Metal [II] sulphates salts of Co , Ni, Cu, Pb , and Zn have been synthesized
in a water – ethanol medium . The formations of the complexes are endothermic processes
Complexometric titration was used to determined the stoichiometry of the formed
complexes . The ligand was characterized by IR and melting point , while the complexes were
characterized by melting point , elemental analysis , conductance , IR and electronic spectral
studies . The complexes are non-hygroscopic, and photo stable crystalline powder with different
melting point ranging from 240 – 290oC. The solubility of the metal-complexes in various
solvents confirmed the diversity of the complexes as the ligands. The molar conductance values
reveal a non- electrolytic nature. The coordination process takes place through the carbonyl
oxygen and the amino nitrogen atom , the anionic ion is in the outer sphere of the
complexes . The complexes were proposed to have the formulae [ML1L2]SO2-
4 .nH2O ( where
M= Ni(II), Co(II) , Zn(II) , Cu(II) , Pb(II) and L1 = salicyladehyde benzoyl acid hydrazone and
L2 = acetylaldehyde benzoyl acid hydrazone , n = 2, 6 , 7 . ) . Both the ligands and complexes
show no significant activities with the micro organisms tested with probably due to few nitrogen
atoms attached with the compounds

Author(s): O .W. Salawu, P.K. Onoja and J. F. Sale

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