Cobalt, Nickel and Copper Complexes of Bis (vanillidene) phthaloloylhydrazide | ||
| Tikrit Journal of Pure Science | ||
| Article 1, Volume 19, Issue 5, August 2014, Pages 45-51 | ||
| Authors | ||
| Issam J. Sallomi; Wijdan A. Al-Zeadan | ||
| Abstract | ||
| Abstract A series of neutral and anionic mixed metal complexes of cobalt(II), nickel (II), and copper (II) have been synthesized by the reactions of their metal salts with the Schiff base ligand bis(vanillidene) phthaloloylhydrazide (VPH4), derived from vanillin and phthaloloyl hydrazide. Structural features of the complexes were obtained from their elemental microanalysis, magnetic susceptibility, molar conductance, UV-visible and IR spectral studies. The data showed that these complexes have compositions of the type: [M3(VPH4)2X6], [M2M*(VPH4)2X6], [MM*M**(VPH4)2X6] for the neutral complexes (type I), and K2[M3(VP)2], [MM*(VP)2], [MM*M**(VP)2] for the anionic complexes (type II), where M, M*, M** represent Co+2, Ni+2, Cu+2; VPH4 and VP are the neutral and tetra-basic forms of the ligand and X= Cl or NO3. Neutral complexes were obtained from neutral reaction medium where the ligand acts as neutral hexadentate forming octahedral structure. In alkaline reaction medium, anionic complexes were obtained where the ligand acts as tetrabasic hexadentate giving tetrahedral and square planar structures. The study of the nature and stability of the complexes was carried out by Job method and revealed the formation of 1:1 metal to ligand species in neutral solution which have similar stability constants. | ||
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