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Studies on Some Nickel(II) and Cobalt(II) Mixed Ligand Complexes of Arylsalicyl-Aldimine and Other Ligands
Authors:A I El-Said
Institution:(1) Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt
Abstract:Several new mixed ligand complexes of Ni(II) and Co(II) of p-tolylsalicylaldimine (Sal-TH) or p-anisylsalicylaldimine (Sal-AH) with 8-hydroxyquinoline (HOx), benzohydroxamic acid (BH2) or α-picoline (α-pic) have been synthesized. The complexes have the general formulae: M(Sal-T)L],M(Sal-A)L]⋅H2O or Ni(Sal-T)2(α-pic)2]⋅H2O where M=Ni(II) or Co(II), Sal-T=p-tolylsalicylaldiminate, Sal-A=p-anisylsalicylaldiminate, L=8-hydroxyquinolinate or benzohydroxamate and α-pic=α-picoline. Analytical, conductivity and spectral data support a square planar structure for Co(II) complexes and octahedral structure for Ni(II) complexes. The thermal behaviour of the complexes has been studied by TG and DTG techniques. It was proposed that the decomposition of the complexed Schiff base takes place via a radical mechanism while for 8-hydroxyquinolinate or benzohydroxamate via proton transfer. Kinetic parameters of the thermal decomposition process have been computed by means of Coats-Redfern and Horowitz-Metzger methods. This revised version was published online in August 2006 with corrections to the Cover Date.
Keywords:arylsalicylaldimine  8-hydroxyquinoline  metal benzohydroxamate
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