chelating behaviour of 1,1,3,3-propanetetrasalisoyl tetracarbohydrazone
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The reaction of 1,1,3,3-propanetetrasalisoyltetracarbohydrazone (HgPTSTCH) with some metal ions in ethanol-aqueous medium has been studied. The isolated complexes were formulated as [Cu4(PTSTCH)8H2O] 4H2O, [Co4(PTSTCH) 12H2O] 6H2O. [Sn4(PTSTCH) 8H2O] and [(UO2)4 (PTSTCH) 8H2O] on the basis of elemental and thermal analyses. Their structural assessment was supported by molar conductance, magnetic moment and spectral studies. The NMR (^H and ^C) spectroscopy was used to elucidate the structure of the chelating molecule. Since HgPTSTCH has four hydrazone moieties -CONHN=CHC6H4(o-OH) each one contains four donor groups, it coordinates with the studied metal ions as ONO system with each of the four metal ions forming tetranuclear complexes. Each coordinating site binds through the phenolic oxygen, the azomethine nitrogen and the enolic carbonyl oxygen atoms.