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TRINUCLEAR VAMLLIN-HYDRAZIDE SCHIFF BASE COMPLEXES | ||
| Tikrit Journal of Pure Science | ||
| Article 1, Volume 19, Issue 1, 2014, Pages 83-88 | ||
| Authors | ||
| Issam J. Sallomi; Wigdan A. Al-Zeada | ||
| Abstract | ||
| Abstrsct In this work the preparation and characterisation of some new homo hetero tri-nuclear complexes of cobalt, nickel and copper. These complexes were prepared by the reactions ofthe chloride and nitrate salts ofthe above mentioned metals with the Schiff base ligand vanillidenesuccinohydrazide (VStIa) , derived by the condensation of vanillin and succinoloylhydrazine . The isolated complexes have the general formulae :[M3(VSH4)rM, [MrM(VSrL):X6], [MM'M'(VSIl4)r)k], Kr[M3(VS)r], Kr[M, M(VS)r] and Kr[MM'M"(VS)2];where M, M'M" are Co*2, Ni*2 and Cu*2, respectively, VSHa and VS are the neutral and the tetra basic forms ofthe ligand and X = CI or NOr. Neutral complexes (Type I) obtained from neutral medium and anionic complexes (Type ll) result from basic medium. The characterisation and studies ofthe ligand and its complexes were carried out by elemental microanalysis, molar conduclance, magnetic susceptibility and spectral measurements . The above different studies revealed that tie metal ions are hexacoordinated in neutral complexes giving the most probable octahedral structure, while the anionic complexes are tetracoordinated with the expected tetrahedral or square planar geometries. In both types the ligand acts as hexadentate coordinating through carbonyl (or enol) oxygen, azomethine nitrogen and phenoxide oxygen atoms. The composition and stability for some of the complexes were studied in solution using Job method which showed l:l metal to ligand ratio and similar stsbility constants | ||
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