Preparation and characterization of some metal ion complexes

Some complexes of isocyanato benzoic acid hydrazide [ ICBAH ] with Metal ion sulphates salts of Co(II) , Ni(II) , Cu(II) , Pb(II) and Cr(III) have been synthesized in a water – ethanol medium . The formations of the complexes are endothermic processes . Complex metric titration was used to determined the stoichiometry of the formed complexes . The ligand was characterized by IR and melting point studies , while the complexes were characterized by melting point , elemental analysis , conductance , IR and electronic spectral studies . The molar conductance values reveal a nonelectrolytic nature. The complexes were proposed to have the formulae [ML2]SO2- 4 .nH2O ( where M= Ni(II), Co(II), Cr(III), Cu(II) , Pb(II) and L= isocyanato benzoic acid hydrazide and n = 2-6 ) . The complexes are non-hygroscopic, air and photo stable crystalline powder with different melting point ranging from 202 – 280oC. The solubility of the metal-complexes in various solvents confirmed the diversity of the complexes as the ligands. From analytical and spectroscopic data obtained, the complexes were proposed to be of octahedral. 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

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